Fuel issue... AGAIN. Need help!
Fuel issue... AGAIN. Need help! Having another fuel issue with my 383 stroker 93 z28. The first issue was no fuel was getting to the rails. A line had gotten kinked on the fuel pump.. fixed it, now fuel is getting up to the rails, BUT -
I'm only getting 15psi at prime. I have tried priming it multiple times and bleeding the lines with the gauge with no luck. The gauge jumps to 15psi then goes right back down to 0 right away, key on ignition off. It doesn't stay at 15, which I thought was weird, but not sure.
Then when I start the car, I'm getting about 25-28 psi at idle, with no variance in pressure if you give it gas at all.
I've got an adjustable fuel pressure regulator, but no matter what adjustment I make on it, the pressure remains low. Brand new fuel filter. I pulled the fuel line before the filter, turn the key forward to prime, and gas pours out at a decent rate. It doesn't come out under really high pressure, but it comes pours out about 1-2 feet from the line.
Where should I look to? The only thing I can think of is if somehow a line is kinked on the fuel pump again, or something similar. If anyone has any ideas, please, I'm all ears!
Thanks guys
I'm only getting 15psi at prime. I have tried priming it multiple times and bleeding the lines with the gauge with no luck. The gauge jumps to 15psi then goes right back down to 0 right away, key on ignition off. It doesn't stay at 15, which I thought was weird, but not sure.
Then when I start the car, I'm getting about 25-28 psi at idle, with no variance in pressure if you give it gas at all.
I've got an adjustable fuel pressure regulator, but no matter what adjustment I make on it, the pressure remains low. Brand new fuel filter. I pulled the fuel line before the filter, turn the key forward to prime, and gas pours out at a decent rate. It doesn't come out under really high pressure, but it comes pours out about 1-2 feet from the line.
Where should I look to? The only thing I can think of is if somehow a line is kinked on the fuel pump again, or something similar. If anyone has any ideas, please, I'm all ears!
Thanks guys What was wrong with the stock fuel pump assembly, lines, regulator and hoses? The need to upgrade them is about 250HP away.
The AFPR is also a poor choice - completely unnecessary. I would start by pulling the tank and replacing the pump assembly with factory (or equivalent) plastic fuel tubing (Racetronix can supply you with these parts), and ditch the AFPR as they can often cause more trouble than good.
Notice the trend here - stock parts work. If it ain't broke, don't fix it.
The AFPR is also a poor choice - completely unnecessary. I would start by pulling the tank and replacing the pump assembly with factory (or equivalent) plastic fuel tubing (Racetronix can supply you with these parts), and ditch the AFPR as they can often cause more trouble than good.
Notice the trend here - stock parts work. If it ain't broke, don't fix it.
Well with 180k on the stock fuel pump, and a 200hp increase in power it seemed like common sense to upgrade the pump.
I might try and swap the stock FPR on and see if that helps.... Gonna pull the pump back out too and check the lines, maybe get braided steel lines.
I might try and swap the stock FPR on and see if that helps.... Gonna pull the pump back out too and check the lines, maybe get braided steel lines.
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Verdad Gallardo I said fuel pump assembly, not fuel pump. I meant the internal parts that the pump attaches to, including the lines.
You either have a very weak pump, stuck injector, bad regulator, or broken lines in the tank.
I meant the internal parts that the pump attaches to, including the lines.You either have a very weak pump, stuck injector, bad regulator, or broken lines in the tank.
It would also be apparent in that injector's corresponding cylinder by looking at the spark plug.
Cool thanks for the help guys. I'm going to check the lines first... it seems like it has to be a punctured line, since it's not holding pressure when you prime it... I will investigate and report back.
It is a requirement for the stock FPR to hold pressure for a little bit after the car is shut down. Aeromotive states on the instructions for their AFPR that they will not hold pressure after the car is shut down. I looked on there site for it but I didn't see it, I know I read it when I installed mine.
Think I found the problem today. I pulled the pump back out, kept the bottom submerged in gas, and primed her over. Gas shot out the plastic accordion hose.. it had a cut in it.
So I used some rubber fuel hose and made a new line, primed it over.. the hose held up just fine, but gas started spraying out of a small hole next to the outlet on the pump. I called SpeedTweekerz and they said that hole is just a freezeplug type deal and nothing should be coming out of it.
So I guess I've got a bad pump now too lol. Getting it warrantied out and we will see what happens!
So I used some rubber fuel hose and made a new line, primed it over.. the hose held up just fine, but gas started spraying out of a small hole next to the outlet on the pump. I called SpeedTweekerz and they said that hole is just a freezeplug type deal and nothing should be coming out of it.
So I guess I've got a bad pump now too lol. Getting it warrantied out and we will see what happens!
Trying to run a pump partially submerged in fuel is a good way to end up in a burn unit.
Pumps are not explosion proof, they only are safe because there is not enough oxygen (read too rich of a mixture to burn) in the tank to explode.
My first post stated not to use rubber hose in the tank.....
Are you planning to remove it again?
Pumps are not explosion proof, they only are safe because there is not enough oxygen (read too rich of a mixture to burn) in the tank to explode.
My first post stated not to use rubber hose in the tank.....
Are you planning to remove it again?
I only used the rubber hose as a temporary fix to see if the pressure raised or not, I was planning on using some braided lines when I reinstalled it.
My last post stated I sent the pump in for warranty.
So the next time I install the pump it will be with braided lines and hose clamps on every connection.
Why would a fuel pump explode randomly just because it is exposed to air...?
My last post stated I sent the pump in for warranty.
So the next time I install the pump it will be with braided lines and hose clamps on every connection.
Why would a fuel pump explode randomly just because it is exposed to air...?
