When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Things I replaced
injectors(all 8)
fuel pressure regulator(Acdelco)
fuel filter
Fuel pump( just the pump Delphi)
I only have about 2-3 gallons in the tank. The first pic is priming the pump, the second pic is the car running, third pic is the car being off for 10 minutes, and the fourth pic is the car off for 20 minutes. The car doesn’t cut off and when I take off the vacuum hose from the fuel pressure regulator the fuel pressure spikes up to 40 psi. My question is do I have to put in more gas to get more fuel pressure? 1st pic 2nd pic 3rd pic 4th pic
There is nothing wrong with your fuel pressure. At idle the fuel pressure will be reduced by engine vacuum so the pressure across the injectors is still at the same relative difference which is around 43 PSI. You have 40 PSI at the rail on your gauge with the vacuum line off and the engine at idle, that is fine. The real question is what is the pressure at WOT when driving, if it is still at 40 PSI that is fine.
The real question is what is the pressure at WOT when driving, if it is still at 40 PSI that is fine.
I concur! tape the gauge to the windshield, get out and go WOT in 1st, 2nd, 3rd. If pressure drops below 40, then you either need a new pump or have a kink or other issue in the lines.
I concur! tape the gauge to the windshield, get out and go WOT in 1st, 2nd, 3rd. If pressure drops below 40, then you either need a new pump or have a kink or other issue in the lines.
There is nothing wrong with your fuel pressure. At idle the fuel pressure will be reduced by engine vacuum so the pressure across the injectors is still at the same relative difference which is around 43 PSI. You have 40 PSI at the rail on your gauge with the vacuum line off and the engine at idle, that is fine. The real question is what is the pressure at WOT when driving, if it is still at 40 PSI that is fine.
I only have 30psi of fuel pressure when the car is at idle and I have to get brakes and rotors first to see how the pressure is while driving
I only have 30psi of fuel pressure when the car is at idle and I have to get brakes and rotors first to see how the pressure is while driving
That is fine, that is what it should be around idle, as explained the fuel pressure is reduced at idle by the engine vacuum so the pressure across the injectors stays the same. If you have 10 PSI of vacuum at idle the fuel pressure will drop to 30 PSI because the 10 PSI of vacuum plus the 30 PSI of fuel pressure will give you 40 PSI across the injector where it should be.
You said in your opening post that pressure goes to 40 PSI when you remove the vacuum line from the regulator. This is what is should be. Until you fix your brakes and road test your car consider the fuel pump good.
You said in your opening post that pressure goes to 40 PSI when you remove the vacuum line from the regulator. This is what is should be. Until you fix your brakes and road test your car consider the fuel pump good.
Yes with the vacuum hose of the fuel pressure regulator it is at 40 psi, but from my understanding I thought the fuel pressure with the vacuum hose connected to the fuel pressure and at idle was supposed to be at 40psi
Yes with the vacuum hose of the fuel pressure regulator it is at 40 psi, but from my understanding I thought the fuel pressure with the vacuum hose connected to the fuel pressure and at idle was supposed to be at 40psi
40-42 vacuum hose off, and much more importantly, at WOT all the way to redline (hose back on).
In the 30s with vacuum hose on, engine on, at idle
You are beating this horse to a pulp. Get the car running, add gas to the tank and take the car for a few WOT runs. It's the only reliable way to diagnose the fuel pump.
40-42 vacuum hose off, and much more importantly, at WOT all the way to redline (hose back on).
In the 30s with vacuum hose on, engine on, at idle
You are beating this horse to a pulp. Get the car running, add gas to the tank and take the car for a few WOT runs. It's the only reliable way to diagnose the fuel pump.
Appreciate it and just trynna understand, also which deatschwerks pump 200,300? Just incase the Delphi is no good
Appreciate it and just trynna understand, also which deatschwerks pump 200,300? Just incase the Delphi is no good
I installed the 250lph in my car. Nothing additional is required... Just swap pumps.
Maybe have complained about Delphi pumps not holding pressure and failing.
However, you need to properly diagnose what you have first.
I installed the 250lph in my car. Nothing additional is required... Just swap pumps.
Maybe have complained about Delphi pumps not holding pressure and failing.
However, you need to properly diagnose what you have first.
I’ll get the brakes and rotors as soon as I can n see what the fuel pressure is at WOT then go from there
Not enough gas?
