Ford 6.7L Power Stroke Diesel :: Fuel Consumption At Idle During Arctic Operation
Jan 20, 2017
Did a little experiment today. I was in Fairbanks this week and today it was between -35* and -40*F. Quite frankly I was too lazy to park my truck behind the building and plug in, so I just left it running.
2015 F350 KR, 63k miles. Fully deleted and tuned with a PPE Ez-Lynk. I've been running the stock tune because mileage seems about the same between all of them and when it's winter with ice and snow, you don't go anywhere fast. 5W40 synthetic oil with 7300 miles on it and 220ish hours. Change engine oil soon light has been on for the last 200 miles and 20 hours.
I have the BD Diesel high idle kit with the rotating switch to adjust the idle level. Fuel consumption was monitored using the truck computer, which I have found to be very accurate on a consistent basis. Computer was reset at the start of each trial.
Trial 1: RPMS set at 1250 via high idle kit. Truck idled for 6 hours, 10 minutes. Fuel consumption was indicated at 5.2 gallons, or roughly .85 gallons per hour. Engine oil temp was about 185*F (remember ambient temp is -40). I was pretty surprised at how much fuel it used.
Trial 2: Back from lunch at Taco King. Figured the truck itself is pretty smart, so if the engine got too cold, it would probably boost the RPMS on it's own. Turned high idle off. Idled for 4 hours 15 minutes. Fuel consumption was 1.8 gallons, or roughly .43 gallons per hour. Engine oil temp was 150*F. Much more reasonable consumption.
.85 gallons an hour is pretty expensive but .43 gallons an hour is much, much more economical.
The biggest difference, besides fuel consumption, was engine oil temperature with a 35* difference. Is 150*F a safe, sustainable oil temperature for these engines to idle at without causing excessive wear?
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As most of us probably do up in the colder regions, idle time likely increases to some degree. I do have and use the high idle mod unless it's a cold start and the truck does it on it's own during warm up.
I guess what I have always wondered is how much fuel does one actually use during idle? Reason I ask is it has not really hurt the mileage that much at this point from what I have been seeing. Sure it does go down but it's not really bad.
How long do posters here let a truck sit and idle, for instance when running an errand or making a stop?
10 minutes?
20?
Longer?
We all know during cold weather the big over the road trucks will sit for an hour or longer when drivers stop, and most let them run all night if at a truck or rest stop.......granted the circumstances are different.
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I head out to work this morning and truck drive fine. I do not get on it. I cruised on the highway for 12 miles at 70 mph. I get to a traffic light and then it begins to idle rough and my fuel pressure gauge reads 0. I replace both filters over a month ago and did the blue spring upgrade at the same time. I've put over 2000 miles on the truck since then without issues until this morning. Also the fuel pump was replaced by the dealer a year ago in July. No check engine codes. Where do I start looking?
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I fear my truck may be stuttering on acceleration.
I hooked up a fuel pressure gauge tonight and the fuel PSI at idle and under acceleration... barely moved. Stayed between 60-62PSI.
I'm thinking this isn't normal... shouldn't the PSI be reduced especially when I accelerate hard ?
I'm thinking the "delivery" fuel line... perhaps there is a bottle neck somewhere which is causing constant PSI at the fuel housing ?
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Just a quick question on my new 6.7l instantaneous fuel economy display (green bar). At idle, the bar is pegged at 40l/100km. When the vehicle is moving, the bar graph drops down to its proper 14ishL/100km mark.
At idle, the vehicle display should be under the 14L mark, because the engine is using little fuel. When the display is pegged, it also causes the number display on the graph (the instantaneous 14L/100 number) to creep up as well. In the span of 3 or 4 minutes at idle, the instantaneous average (calculated number) will creep from approx 14.5l/100 to 19l/100. So its pretty obvious the computer is using the 40l/100 number in its average.
Id almost swear that the display was working correct when the truck was new (2 wks ago), I've done nothing to change it, but for whatever reason its working backwards to what it should be doing (all my other vehicles' instantaneous display drop to almost 0 when at idle).
Its not the end of the world, and I can wait till its at the dealer next time to figure it out, but it is a bit of an annoyance. I am not in the middle of a regen or something like that either, AFAIK. Actual mileage on a tank of fuel isnt reflecting that 40L/100 figure on the display.
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I have a friend with a 2012 F250. The truck has 100K miles and it does idle for extended periods. The other day his check engine light comes on so he took it the shop. They had not told him anything yet, but they did tell him that he had about a gallon to much oil. They said it was fuel.
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I got a "P054F- Idle Control System - Fuel Quantity Higher Than Expected" this morning and again this afternoon. I did a search and the only threads that contain the code are the codes lists and one guy who got the code but no follow up. I found a few instances through Google, but almost all of them said the dealers just reset the code. It seems to happen in cold weather, which we are having. Both instances were in the same situation, remote start warmed up then short town drives. No CEL came on. Anyway, I reset it and I'll see what happens.
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What is the hourly fuel consumption for a Toyota Prius at idle? Purpose is keep cabin warm for 8 hours. Would this damage engine?
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So, I just had the fuel pump replaced on my '15 6.7 a month ago and it just died again. (next day edit: it didn't actually die, it showed all the same symptoms)
Same symptoms: whining sound, low fuel pressure warning, reduced power warning.
This time I'm 50 miles from home so I pulled off the road before it shut off. Interesting, I was in a hilly area and my low fuel warning came on too. We are waiting for a tow. I was considering trying to push on but don't want to get stuck in a dangerous spot on the highway. We're in a church parking lot.
So, last time this happened I was on flat road with about a half tank of fuel on a lunch break. I ran a mile after the warnings came on to feel out the issue and to see what would happen. I happened to be only about a mile away from my dealer so I drove that way. I got reduced power warning and then it cut power on me (limp mode). I made it to about 100 yards away before it cut off.
This time, I was in a hilly area at night on a windy two lane road with no shoulders in the woods. I was miles from civilization and was showing below a quarter tank of fuel. ~100 miles to EMPTY. I got the low fuel pressure warning first and then the reduced power mode before the whining noise started. I was climbing a hill on a curve at the time. I drove a quarter mile and then pulled off the road into a parking lot so I wouldn't be stuck on the shoulder. It didn't actually go into limp mode.
I let it sit a few minutes, talked it over with the wife and decided to call for a tow. After talking to the tow truck driver who said he would be an hour because he had to go find a bigger truck, I decided to see what I could do while I wait. I fired it back up and the fuel level dropped to below 1/8 and I was now showing 33 miles to EMPTY. I was parked on a hill with the back end up. I had backed the truck into a space to make it easier for the tow truck driver. I let it run a minute, checked for leaks and it seemed to run fine with no studdering or additional warning lights.
CEL was on but no new warnings. I put in my code reader and pulled the P0087. Just one code. I revved it a bit to see if there were any issues. It seemed fine so I decided to try my luck. I started driving towards home with the intention to stop at the first diesel station to fill up. Truck ran fine. After two minutes of driving gently, heart racing, my fuel level came back up and it now read 88 miles to EMPTY. I drove 11 miles to the nearest station and filled up. No issues. I shut it down. I fired it back up. Still no issues so with a full tank, I drove home the remaining 30 miles without issue.
Planning to take it in to the dealer Monday to get it checked. Could this be from an air pocked due to low fuel level and hilly terrain? Is my new pump dying already? Is there something else going on inside the tank or elsewhere?
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I have my aux fuel tank pump hooked to upfitter 3. It has worked perfectly until this week. I started to transfer fuel and the aux fuel gauge and fuel pump both quit. The led on upfitter switch 3 still illuminates, but no fuel pump. I found fuse 9 on passengers kick panel is for upfitter 3. The fuse was good. Is there another fuse somewhere for the circuit I've missed? I can trouble shoot the wiring if necessary, but it's tough to do all behind the left side underbed box and not easy to get to. I've missed something simple before I go further????
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I have a 2006 F250 c/c LB and I am curious, how much fuel is left in the tank when the low fuel light comes on?
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For the last four months my 04 F350 has been having the same problem every now and then. Cruising down the highway at a decent speed and the fuel pedal/fuel shuts off. Only lasts seconds then re-engages. Two lights come on. Low fuel and water in fuel. I changed the internal fuel pump last week and it did it again tonight. The truck runs great otherwise except for an occasional death shake while stopped at a light. No codes came up and FICM is at 54.
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Changed fuel filters today. Now my water in fuel light is coming on. But the truck is not running any different no sputtering or anything. ????? Could this be human error
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I have a very slow fuel drip off the housing for the fuel filter on the engine. Can't see where it's coming from. It started sometime after I changed the filter a couple of months ago.
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Purchased 2011 3 weeks ago. Due to not paying attention, put gas in diesel. Had tank dropped and drained but after reassembly, fuel gauge inop. When turn ignition switch on, get normal sweep of all dash gauges but fuel gauge does not read. 2nd tech says sender okay, must be gauge. Dealer ssays if it sweeps, it isn't the gauge. 011 F250 6.7L.....
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What it is or why there is a three inch pull handle hanging down on the bottom of the Diesel Tank on my niece new 2012 F350??? It is sitting hanging there begging to be snagged and ripped off the bottom of the tank!!!!! I'm at least going to Gorilla Tape it up to the bottom of the Tank.
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no change, changed stand pipe and dummy plug on driver side, no change and guess what? Now I am stuck on the side of the road waiting to give my last $100 to a tow truck! Engine is hydrolocked, fuel pressure is low, starts off at around 20 and works up to 54 with key on engine off, and that is as much as I know from the side of the road with out my AE. Blew white smoke also. Smelled of unburnt diesel. I think it's linked to my rough running issue. Maybe a bad injector? But every time I did the click test they all passed. Idk, I'm gonna remove the glow plugs and see which hole is loaded and with what. . .
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I am unable to get fuel delivery from tanks to engine in normal operation. I can however get pumps working with jumper wire to them. It will start with ether but not stay running on it's own. Could this be a relay or something in tfi thing ?
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So this morning, I stopped for fuel. My low fuel light had come on yesterday, so I planned on filling it up this morning. Swung through the local Safeway (my usual fill-up haunt) and threw 25 gallons of diesel into my Excursion. Truck started up right away, like always, pulled around in the parking lot, pulled into traffic, then got stopped at a red light. I noticed a slight unevenness in the idle for a couple of seconds, then the light turned green. Pulled out, truck accelerated a bit more labored than usual, and in my passenger's mirror, I looked back and saw some light greyish blue smoke.
The smoke progressively got heavier, power diminished, and I was no longer able to maintain speed with traffic. I pulled off onto a side road, shut the truck down, and scanned for pending codes. Nothing. So I hoped that it was just a gremlin, started the truck again, got tons of the same smoke, really rough, super clattery idle, and the engine wouldn't even accelerate in park. No hint of boost, nothing. So I turned the truck off, called a tow truck, and had her flat bed hauled home.
Background on the truck, roughly 150K miles, changed the fuel filters not too long ago (less than 7K on them), recent-ish oil change, but I was planning one for later this month. Truck is all but stock, only an aftermarket cold side intercooler tube. I recently replaced my EGR valve, less than a year ago, because it was stuck partially open, replaced it and the truck ran great after that.
I've been seeing some scary writeups for similar things, stuff involving cracked pistons, bad rings, engine teardowns, new engines required, things like that. For me, it just seems like a ridiculously convenient coincidence that the problem would happen immediately after refueling the truck. At this point, I'm planning on replacing both fuel filters and doing an oil change as preventive maintenance and as the easiest possible fix, but what else should I be looking at? Some posts suggest FICM, some suggest ICP sensor, some are saying my injectors may be shot.
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I have a 2006 F250 with a 6 liter diesel I got about a hundred sixty thousand miles on it I've had it bullet-proofed haven't had too many problems with it I thought the fuel pump went out yesterday so I replaced it drove fine for a few hours then it started losing power and like it wasn't getting fuel and died I got it home took a test light and check for power at the fuel pump I don't have any positive or negative power ran a hot wire and a ground straight from the battery and hooked it up to the pump and it worked but when I plug the factory wiring back into it and turn the key on I don't have any power I checked the fuses they're fine...
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1st diesel was a 1997 F350 dually (White Lightning). Upgraded last year to a 2015 F350 (The Rocket Sled)- the kids named it hahaha. Had to take the 6.7 (9200 miles) into the shop... Last Sunday I took the truck out and about 5 minutes from home I got the low fuel pressure warning. Pulled over and tried to purge air out of fuel system- the low pressure pump was making a terrible racket. Turned around and limped home- reduced power came on soon after. Parked it until I could get to the dealership on Tues. Long story short- dropped it off at the dealer (low pressure pump still making noise/ no low fuel waning, just CEL light).
Called to check status today- dealer can't seem to duplicate problem. Service advisor said if mechanic can't find anything wrong, service manager was going to take it out and try to duplicate. The is the 2nd time I've got the low fuel pressure warming. The first time (around 4000mi. ) was in winter- I changed out fuel filters and it went away. I was towing the 5th wheel. Just had to vent-I have to get this figured out. I wouldn't thing the filter could get clogged within 5k miles. Have a camping trip scheduled next week!!
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