Ford 6.0L Power Stroke Diesel :: Fuel Pressure PSI And Flow
Feb 22, 2017
I've done some searching on this site and found some good information but I still have some questions about Fuel Pressure and fuel flow. A few months back when I had a bad injector and bubble tested to verify and it took around 15 seconds to fill the bowl(filter removed) from near empty is that normal or the sign of a healthy HFCM?
Tonight I was able to check the fuel pressure for the first time and when I turned the key on fuel pressure was slow to build for 2-3 seconds held at 20 psi then spiked up to 62psi and stayed at that psi during the starting cycle and held steady during idle. Is it acceptable to hesitate with a pressure build at the beginning of the cycle?
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My truck threw a P2073 code. Its Manifold Absolute Pressure/Mass Air Flow - Throttle Position Correlation at Idle. I do have aftermarket intake. It threw this code 2 weeks after install. Does this mean my mass air flow sensor is going to fail soon?
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I changed out my fuel filters today on my 2016 F350 SD and right parts, no leakes, main filter full, and I did the 6 cycle fuel pump prime. Turns over but won't Start. Redid the 6 cycle prime several times now and still no start. Pulled the 2ndary filter lines while it was priming to see if flowing and got squirted on both lines.
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My truck gave me low fuel pressure and reduced pressure limp mode at 21,000 miles. The fuel and air filters were changed at 16,000. The dealer said all they found was the fuel filters (at 21,000) were what needed to be changed. Also, why does my truck hum??
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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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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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Driving to work out of town and low fuel pressure came on screen.... fuel filters??
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I just installed my fuel pressure gauge, only to find out that I'm running with low fuel pressure at wot. My filters have a little over 2000 miles on them and I've had the blue spring installed for a while now. It drops to about 36psi from 61 or 62psi. What could be the culprit? Also I'm running the out of the box street tune that comes with the sct x4 because I get about 15mpg with it.
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truck runs fine changed fuel filters could it be bad sensor .no cold weather
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I recently installed a glow shift fuel pressure gauge. All seems good.
@ idle 58-60 psi
@ WOT drops to 50 psi, no less.
Tonight I went to catch up to a car that had no lights on at all to tell them and during WOT fuel pressure gauge showed it dropped to less than 30! I let off immediately and it went right back up. I tried to repeat it with another go @ WOT and it would not go under 50 psi like normal.
Motorcraft fuel filters less than 3000 miles ago .. Blue spring installed over the winter.
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So I just replaced the low pressure fuel pump on my 14 6.7 and it seems to be running as good as it was before. I need to get an aftermarket fuel filter setup for my truck. So what are you using, why did you pick that particular system and is it working, does it really work for taking out water and other contaminates? These fuel systems don't seem to be up to par in filtering modern day fuel, I need peace of mind.
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Low-pressure fuel warning came on two separate times Sunday ... I know what caused it the fuel gel 18 below not enough anti gel in the tank no big deal warm the truck up everything's fine now no more warning lights coming on does the dealer need to reset anything I guess I'm asking did it throw a code that needs to be cleared? Its running fine now I guess I'll just have to put a little extra in when it gets that cold wasn't expecting - 18 checked drain no water just gel up could here the pump under the truck fighting to pump for a few minutes.
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65 miles an hour driving down the interstate (I-5) pulling my 5Th Wheel and I look in the mirror and I see at first what I thought was smoke coming from the trailer and then I glanced at my dash and up pops "warning of Low Fuel Pressure". I pulled over as quickly as I could and when I stopped there was diesel fuel spray coming from under the hood. Turned off the key yelled for wife to get out of the truck now. Popped the hood and there was fuel dripping from the engine the all the way to the rear bumper and the front of the trailer.
Since I just had Ford service the truck and change the fuel filters three weeks ago I knew exactly what happened as I looked at the fuel line and seen the green retainer clip wasn't seated properly to the filter canister. I pushed the line in and seated the green clip. What I don't understand is I have driven the truck 200 miles since it was serviced. I re-attached the line and made sure the clip was seated correctly, poured 5 gal of water on the engine plus after using a roll of paper towels to soak up fuel. I didn't want to panic the dear wife but it could have very easily all went up in smoke!
What a mess it made of the Trucks undercarriage and 5th wheel. Going give a call to Ford tomorrow to hear what they can do to clean up this mess.
Question? This happen on a 6.7 after a filter change?
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I have a '13 with 11,000 miles that the low fuel pressure light has come on a few times this winter. I took it to the dealer and told them what was going on. They only changed the fuel filters and didn't investigate any farther. The paper work also said it was the low fuel light and not the low fuel pressure light...
It was fine for a few days but then it happened again. The fuel pump would make some noise as well. The light comes on and the fuel pump makes noise when the temp is close to 0 and I accelerate to highway speeds. I am running winter blend fuel and running the Ford anti gel so the fuel shouldn't be gelling.
I stopped in at the dealer again about a week ago and the service manager wouldn't send anyone out to listen to the noise. He set up an appointment for today. Today it was -8 when I dropped it off at the dealer and the light didn't come on and there wasn't any noise. It is supposed to be cold overnight so they are going to keep it to see if they can get it to act up again. They called into Ford but no answer from them yet.
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I've read the fuel pressure gauge install threads in the tech folder. Was wondering if the ISSPRO fuel pressure gauge with the sending unit plugged directly into the test port was a reliable option. On my 7.3L's I went through sending units often, until ISSPRO came out with an upgraded sending unit then all was good.
Also, not sure which OBD monitor will have fuel pressure as an add-on option. I've seen how the SCT and others will have an option for EGT input, but I haven't read much about fuel pressure input. Trying to decide between gauges and a monitor for the 6.0L.
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Ok here is a good one. Had a low fuel pressure warning so took it in for service. The warning was intermittent. They replaced fuel filter first, but apparently the low pressure fuel pump needs to be replaced.
Service dept is indicating that the fuel pump is not covered as part of my CPO (certified pre owned) 100K drive train warranty or the extended warranty that this dealership sold me. (wasn't a ford plan but was the one they recommended that would cover everything). Lodged my complaint with the Service manager and waiting on a call back.
Does this make sense to any of you service writers out there
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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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I just had my first fuel filter change (about 9,000 miles). After the shop changed both fuel filters with factory Ford ones, a check engine light came on and a "low fuel pressure" warning, along with a "reduced engine power" warning. It also stalls a lot and takes a long time to restart.
Obviously, they didn't do it right. I suppose there is air in the lines or something didn't go back together correctly.
My '06 seemed to purge itself, but this truck obviously won't. It is not even driveable to get it back to the station, to see if they can correct the problem.
The thing is, I watched them do it, so if someone can ask me the right questions as far as what I saw, maybe I can lick the issue in the driveway myself.
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Changed the fuel filters. No issues in replacing.
Primed them by the book - key on 30 seconds 6 times
Now I have low pressure warning and reduced power.
All parts were FOMOCO...
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I was driving to a job this morning with my truck loaded with tile for a job and it just died.
It has power to the lights, radio, etc. But when I try to start it it does not even crank and it has no fuel pressure on the gauge and the pump is no running.
It is as if the truck has no power. When it died is was like I turned the key off and it just stopped.
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I have a 2016 F350 i purchased about a year ago and now has 7500 miles. last night it tossed up a low fuel pressure message and then de-rated then wouldn't start, i heard a crazy humming sound before it shut off. they pulled the fuel filters "claimed it was gelled" even though it fired right up once it got to the dealership. the fuel i run is good to -9*F and i use ford anti-gel on top of that. So they changed the filters and it wouldn't start again. now they are dropping the tank. So, I am not sure what they are gonna find but I am meticulous when it comes to pulling all the foil off of the anti-gel bottle before even opening the cap. I don't know what could possibly be in the tank to cause the issue.
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