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Username Post: High fuel pressure at idle        (Topic#357472)
tkdtkd 
Frequent Contributor
Posts: 1545
tkdtkd
Loc: Marietta, Georgia U.S.A.
Reg: 08-29-02
07-31-19 06:41 PM - Post#2772131    

1999 5.3 has good fuel pressure when key is turned on. At idle the gauge pegs over 100.



 
rockfangd 
"6th Year" Gold Supporting Member
Posts: 2749
rockfangd
Age: 33
Loc: Utica ny
Reg: 04-13-10
07-31-19 08:52 PM - Post#2772139    
    In response to tkdtkd

If it is truly pegging over 100 I would say the regulator is shot. That is high

Old School GM fan FOREVER


 
someotherguy 
Senior Moderator
Posts: 29010
someotherguy
Age: 49
Loc: Texas
Reg: 08-01-03
08-01-19 04:25 AM - Post#2772153    
    In response to rockfangd

*Fuel* pressure is 100psi at idle? Not sure the fuel pump is capable of deadheading that much pressure...

Is the truck running properly? Do you have another gauge you can test against? You can probably borrow/rent one from the auto parts store.

Richard

06 Silverado ISS / 06 Silverado SS / 06 300C SRT8


 
tkdtkd 
Frequent Contributor
Posts: 1545
tkdtkd
Loc: Marietta, Georgia U.S.A.
Reg: 08-29-02
08-01-19 04:56 AM - Post#2772155    
    In response to someotherguy

LS swap with new inline pump. With just key on it reads good (Autozone gauge). Idle is a little rough but it is new to me, so not sure if that statement is true. Smooth when pedal stepped on. It was giving both upstream O2 codes and I changed those. Sensors appeared to be original. Maybe return clogged? Regulator?



 
tkdtkd 
Frequent Contributor
Posts: 1545
tkdtkd
Loc: Marietta, Georgia U.S.A.
Reg: 08-29-02
08-02-19 09:30 AM - Post#2772237    
    In response to someotherguy

Tried blowing 40 psi air down the return line. Also changed the regulator neither was the answer. Found a clamp on the return line. Took off the clamp and it ran at 50 psi, but spewed gas out the return line. Guess who is pulling the fuel tank?



 
rockfangd 
"6th Year" Gold Supporting Member
Posts: 2749
rockfangd
Age: 33
Loc: Utica ny
Reg: 04-13-10
08-03-19 08:31 PM - Post#2772351    
    In response to tkdtkd

so you are thinking there is a restriction on the return side?
Wonder if it is a kinked or pinched line at the tank

Old School GM fan FOREVER


 
tkdtkd 
Frequent Contributor
Posts: 1545
tkdtkd
Loc: Marietta, Georgia U.S.A.
Reg: 08-29-02
08-04-19 07:15 PM - Post#2772420    
    In response to rockfangd

Pulled the tank and hose clamps on the sender were loose. All the lines were run proper just not tightened..There was a clamp on the return making no return and lots of pressure. Everything was new, hose and clamps. I hate pulling fuel tanks. But it runs at 50 psi now.



 
wagonman100 
Super Senior Member
Posts: 14318
wagonman100
Loc: Baltimore, MD
Reg: 11-27-04
08-05-19 06:48 PM - Post#2772487    
    In response to tkdtkd

Good to hear that it was a relatively easy fix.

Jay
Friends don’t let friends drive Fords.

1999 Silverado Z71 4X4 extra-cab short bed
1983 Malibu Fauxmad - tubbed
1978 El Camino Kustomized
1972 Monte Carlo
1957 210 handyman wagon
1957 Nomad sport wagon
1957 Cameo Carrier


 
rockfangd 
"6th Year" Gold Supporting Member
Posts: 2749
rockfangd
Age: 33
Loc: Utica ny
Reg: 04-13-10
08-05-19 06:56 PM - Post#2772491    
    In response to wagonman100

There you go. Found and solved.
Congrats.

Old School GM fan FOREVER


 
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