OMG Losing Fuel Pressure Again......
#1
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Ok, I have a 98 Z28, I installed the racetronix 255 w/ hotwire kit and ran it to the ALT. Some how I am losing fuel pressure every 4 days. I can drive 200 miles and then all the sudden I lose fuel pressure somehow. It has happened twice now....
It has a brand new battery now. (1 week old)
My fuel pressure regulator has 188K on it, when I bought the aftermarket sock for the pump there was no place to plug the FPR hose to, so I just clamped it to the case of the pump so it wouldn't flop around.
When it starts acting up my fuel pressure goes from 58lbs to 5lbs and stays there, it sounds like it has a huge cam in it, but its stock. If I give it a little gas it dies, the starts right back up. The pump also whines (high pitch) when I am losing Pressure.
Sorry about the on going story just trying to get all the details out there, maybe someone can help me out.....Thanks in advance.....
It has a brand new battery now. (1 week old)
My fuel pressure regulator has 188K on it, when I bought the aftermarket sock for the pump there was no place to plug the FPR hose to, so I just clamped it to the case of the pump so it wouldn't flop around.
When it starts acting up my fuel pressure goes from 58lbs to 5lbs and stays there, it sounds like it has a huge cam in it, but its stock. If I give it a little gas it dies, the starts right back up. The pump also whines (high pitch) when I am losing Pressure.
Sorry about the on going story just trying to get all the details out there, maybe someone can help me out.....Thanks in advance.....
Last edited by philsblwnz28; 11-16-2010 at 01:48 PM.
#3
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well me and another guy on here both have 98 z28s and we are having very similiar problems. OUR problem is the O-Ring on the FPR keeps popping off and causing us too lose alot of fuel pressure and the car wont hardly do anything when it comes off. My only advice to you would be to check the o-ring on the fpr. hope this helps. Also i hope you have the hatch mod cut out so you can get easy access to your pump
#4
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also if your fpr has 188k on it, you may just need to change it. you can get one at the local parts store they arent very much. If i were you that is most deff where i would start. Becuase the fpr controls and regulates all the fuel pressure going to your fuel rail. Try a new FPR with a new o-ring on it. You should be good to go
#7
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Does it sound like it could be vapor locking? When I hook my Fuel Pressure Gauge to the rail (when the car is acting up and still running) I bleed the fuel from the clear hose on the gauge and there are air bubbles in the hose. When the car is running at 58psi it doesn't have any air bubbles....
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#8
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hmm im not sure to be honest with ya...if it were me i would start with the fuel pressure regulator it controls everything pressure related all the way to the fuel rail...start there im sure thats what your problem is
#9
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Sweet, I drove 34 miles today and it acted up again, get home put the gauge on it and it reads flickering 20psi, bleed it real quick and goes up to 58 then falls quickly to 5 psi and then dies. I will replace the FPR tomorrow. I hope this is it. Thanks for the help ryan
#15
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UPDATE: So today I dropped the tank and found the main line going to the fuel filter had some kinks in it, so I replaced it with 3/8 fuel line hose for now till I can get the plastic line.
So I put everything back together and put 9 gallons of gas back in it. Started it up and it ran for 5 minutes with 58PSI then it dropped to 48 and just stayed there (pump whining loud).
There is a purge valve solenoid on the driver side by the fuel rail it was making a loud ticking sound, (never heard it do that before). So I am lost on what to do now. My pump is only a month old, could I have over heated it due to that kink and now it just don't want to work right?
So I put everything back together and put 9 gallons of gas back in it. Started it up and it ran for 5 minutes with 58PSI then it dropped to 48 and just stayed there (pump whining loud).
There is a purge valve solenoid on the driver side by the fuel rail it was making a loud ticking sound, (never heard it do that before). So I am lost on what to do now. My pump is only a month old, could I have over heated it due to that kink and now it just don't want to work right?