Fuel pressure too high=problem?
Cargo Master
Joined: Feb 2005
Posts: 2,837
Likes: 1
In can lead to busted lines/seals and decreased fuel mileage. Do you have a pressure reading? I am running about 72psi and don't notice any ill-effects. I have only heard of people noticing real issues when they got up around 100psi, which really is too high.
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Tuned
Joined: Aug 2006
Posts: 405
Likes: 42
When I checked last summer I had about 85-90 psi IIRC. I've read 65 psi or is the ideal pressure. I have a new Bosch fuel pump to put on from our buddy Clay at Riffraff that is just waiting for free time to install. If that DOESN'T cure the high fuel pressure, what should I check next?
Aaron
Aaron
Cargo Master
Joined: Jun 2010
Posts: 2,771
Likes: 3
From: Louisiana
I doubt the pump israeli is the problem. They deliver a fixed amount and it's regulated but a plunger on the return line mounted to the fuel filter housing. Normally high fuel pressure readings come about when someone has taken apart the plunger and spring assembly. Normally to shim the spring, clean it, change the spring, or install a frx setup. Have you done any of these things?
Cargo Master
Joined: Jan 2002
Posts: 2,079
Likes: 11
From: LA and CO
Check the regulator on the fuel bowl. It may be stuck. And yes, high fuel pressure can cause poor mileage. Basically too much fuel pressure will push fuel through the injector body all the time and cause the injector to "drip" fuel....
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Tuned
Joined: Aug 2006
Posts: 405
Likes: 42
I have not done any checks or repairs other than putting a gauge on the fuel bowl and measuring pressure. When I get time to work on the fuel system I will check those things.
Thanks guys.
Aaron
Thanks guys.
Aaron
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Postmaster
Joined: Jul 2006
Posts: 4,993
Likes: 2
From: Bend, OR
LOL... Reeally?
Do you understand that it takes 400psi to overcome the poppet spring right?
Too high of fuel pressure can cause many issues, including poor mileage, but its not going to cause your injectors to "drip".
There is no perfect fuel pressure, every truck is different, every type of injector is different. Anywhere from 60-75psi is fine.
Postmaster
Joined: Jul 2006
Posts: 4,993
Likes: 2
From: Bend, OR
Short of a broken nozzle, its not possable.
Postmaster
Joined: Jul 2006
Posts: 4,993
Likes: 2
From: Bend, OR
Worn fuel pumps, fuel leaks, worn injectors from too much air being forced into the fuel system... And yes more injection noise.
Cargo Master
Joined: Jan 2002
Posts: 2,079
Likes: 11
From: LA and CO
If I crack open the fuel drain it gets better but if I reinstall the older, lower pressure pump it runs even better.
Postmaster
Joined: Jul 2006
Posts: 4,993
Likes: 2
From: Bend, OR
If they injector is old and worn like mine are there is excess fuel that is forced through it. My truck runs worse with the new fuel pump and more pressure. Idles rough, smokes at idle, etc...
If I crack open the fuel drain it gets better but if I reinstall the older, lower pressure pump it runs even better.
If I crack open the fuel drain it gets better but if I reinstall the older, lower pressure pump it runs even better.
Powerstroke injectors do not "Drip".
