fuel pressure
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Freshman User
Joined: Aug 2010
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From: BIG BEAR LAKE
fuel pressure
I have one question,what would cause the fuel pressure in '88 supercab-2.9 to be way too high.Whenever I pop the gas cap to fill up there's enough built up that it wants to launch.I've never had this issue before with my other trucks and it just seems strange.
Fleet Mechanic
Joined: Dec 2003
Posts: 1,436
Likes: 117
From: Virginia
My first guess would be some sort of clog in the return line. 
Have you checked the pressure at the fuel rail? Something like 44psi (your manual should have the exact psi). This should tell you at least some about how your system is working.
Have you checked the pressure at the fuel rail? Something like 44psi (your manual should have the exact psi). This should tell you at least some about how your system is working.
Thread Starter
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Freshman User
Joined: Aug 2010
Posts: 30
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From: BIG BEAR LAKE
I took the truck in awhile back from what i thought was a fuel delivery problem-poor idle ,rough running,etc and turned out to be bad grounds.Took care of the problem.I know the mechanic so he wasn't gonna BS me,he checked the codes,fuel pressure,etc,everything checked out fine.I have a locking gas cap and usually use 89 or 91.I've used locking gas caps on my other trucks without any problem.I ran a can of seafoam through the system,but other than that i don't know what the problem is.
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Joined: Jan 2004
Posts: 13,851
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From: SW Va
Are you using a Ford locking gas cap????
If not, did the overpressure problem come about after you installed the afermarket cap????
Is the vapor recovery system performing ok????
E-10 fuel has been known to cause some problems, so does your fuel contain 10% Ethanol????
Ford doesn't recommend using higher than the specified octane, as our engines aren't designed, nor timed to make proper use of it & over time it can cause engine deposits & driveability problems.
Any trouble codes pending, or set????
If not, did the overpressure problem come about after you installed the afermarket cap????
Is the vapor recovery system performing ok????
E-10 fuel has been known to cause some problems, so does your fuel contain 10% Ethanol????
Ford doesn't recommend using higher than the specified octane, as our engines aren't designed, nor timed to make proper use of it & over time it can cause engine deposits & driveability problems.
Any trouble codes pending, or set????
