Low fuel pressure
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Senior User
Joined: Sep 2011
Posts: 394
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From: Nederland, TX
Low fuel pressure
So I just checked my fuel pressure with a tire gauge. Checked it about 5 times. And every time it read about 10 lbs. One time it just get pouring fuel out and had to push it back in to make it stop. To check the gauge to make sure it wasn't messed up I checked my tires and the gauge is good.
What should I do?
Time for e-fuel?
What should I do?
Time for e-fuel?
Post Fiend
Joined: Dec 2009
Posts: 15,505
Likes: 18
From: Livoina,La
The tire gauge works just fine. I compared the reading from a tire gauge and a fuel pressure gauge and they were only 1-2psi different.
Rite above where you checked the fuel pressure you'll see a 3/4" brass bolt head pull it out and check to see if the spring is broke
Rite above where you checked the fuel pressure you'll see a 3/4" brass bolt head pull it out and check to see if the spring is broke
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Senior User
Joined: Sep 2011
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From: Nederland, TX
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Post Fiend
Joined: Dec 2009
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From: Livoina,La
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Fleet Mechanic
Joined: May 2011
Posts: 1,414
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From: Thornhill , Ontario
If the spring inside the FPR is good and you have no shim ( BB) it should be at least 40
....ideal is around 65 under load .....Could be the second stage of pump is gone...so I guess it is new pump time or whatever direction you choose ....
....ideal is around 65 under load .....Could be the second stage of pump is gone...so I guess it is new pump time or whatever direction you choose ....
Thread Starter
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Senior User
Joined: Sep 2011
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From: Nederland, TX
Well I pulled the spring this morning, and it looks good. About 1 1/4" long, felt firm but springy.
I pulled the MAP sensor before heading to work this morning, and I'll have to plug it back in just to double check my theory, but I'm 99% sure that the truck came alive with it unplugged. I could actually leave a bit of a black trail behind me. It wasn't a cloud, but a faint trail. I'll have to get it on the highway to tell for sure
A little about my truck. Its a 96 F350 CCLB 4x4. I bought it a little over a year ago with 223K on it. It now has like 245K on it. I actually know the guy that bought it off the show room floor, long story on how I found that out.
The transmission just had a fresh rebuild on it right after I got it. Told the guy I wanted the heaviest of duty parts in it that he could put in it. It has a RSK with 1" leafs in the front, and lift blocks in the rear to level it out. Running Toyo MT 37x13.50x17. I have installed 6637 air filter. And have an Edge HyperMax programer on it stage 3, soon to go after reading on this site. Other then that I'm pretty sure the truck is stock.
Any other questions feel free to ask.
I pulled the MAP sensor before heading to work this morning, and I'll have to plug it back in just to double check my theory, but I'm 99% sure that the truck came alive with it unplugged. I could actually leave a bit of a black trail behind me. It wasn't a cloud, but a faint trail. I'll have to get it on the highway to tell for sure
A little about my truck. Its a 96 F350 CCLB 4x4. I bought it a little over a year ago with 223K on it. It now has like 245K on it. I actually know the guy that bought it off the show room floor, long story on how I found that out.
The transmission just had a fresh rebuild on it right after I got it. Told the guy I wanted the heaviest of duty parts in it that he could put in it. It has a RSK with 1" leafs in the front, and lift blocks in the rear to level it out. Running Toyo MT 37x13.50x17. I have installed 6637 air filter. And have an Edge HyperMax programer on it stage 3, soon to go after reading on this site. Other then that I'm pretty sure the truck is stock.
Any other questions feel free to ask.
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Senior User
Joined: Sep 2011
Posts: 394
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From: Nederland, TX
I feel as though its lost power from the time I got it. Its developed a fuel leak. But Im pretty sure its just one of the blue hoses. But righted a clamp up and it slowed it way down. I've got all the stuff to replace it all. Just haven't had the time to do it. I used to could get about 18mpg out pf it. But it has since dropped to about 15.5mpg. But it all started "feeling" weaker after the tires. When I first put the tires on for a while everything still felt great for the first couple thousand miles until I started noticing the fuel leak.