Low Fuel Pressure
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Elder User
Joined: Jul 2010
Posts: 504
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From: Gulf Coast, TX
Low Fuel Pressure
2002 F-350 4x4 Dually 340,000 miles
Having issues with Low fuel pressure. What I have done so far...... I have a new pump on it (same results from both pumps, which are Bosch pumps ). I have the gauge connected on the pre filter port on the fuel bowl. I am only getting 30 PSI. I have already tried using a clean unrestricted fuel source ( i.e. fuel can ) connected directly to the pump. Still can only get 30 - 35 PSI pre filter. Anything else I need to check. And where do I go from here? I have tried searching other threads but solutions are few and far between when people get stuff fixed.
Thanks in advance.
Having issues with Low fuel pressure. What I have done so far...... I have a new pump on it (same results from both pumps, which are Bosch pumps ). I have the gauge connected on the pre filter port on the fuel bowl. I am only getting 30 PSI. I have already tried using a clean unrestricted fuel source ( i.e. fuel can ) connected directly to the pump. Still can only get 30 - 35 PSI pre filter. Anything else I need to check. And where do I go from here? I have tried searching other threads but solutions are few and far between when people get stuff fixed.
Thanks in advance.
Thread Starter
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Elder User
Joined: Jul 2010
Posts: 504
Likes: 0
From: Gulf Coast, TX
I checked the voltage already under a load and it is fine. I will recheck for obstructions and also change the FPR spring tomorrow. Keep the ideas coming. I am having a major brain fart right now.
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Elder User
Joined: Jul 2010
Posts: 504
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From: Gulf Coast, TX
The FPR is making more and more sense. When I was sucking fuel out of a fuel can it sucked a full 1 ½ gallons in really quick. Like less than 2 minutes. If the FPR wasn't working it would be returning more fuel than it is supposed to therefore causing low fuel pressure correct?
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Lead Driver
Joined: Sep 2010
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You can install a BB under the spring to raise pressure. If too much, cut a coil then recheck..
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Joined: Jul 2008
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From: N.GA Mountains
This is the most common FPR failure and shimming the spring will not help.
If this is your problem, here’s a source for the parts you’ll need.
https://www.dieselorings.com/7-028-f...build-kit.html
You’lll also need the vibraloc sleeve for return line.
If this is your problem, here’s a source for the parts you’ll need.
https://www.dieselorings.com/7-028-f...build-kit.html
You’lll also need the vibraloc sleeve for return line.
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