Now fuel pressure problem

[Momohenri]

After changing the fuel pump and filter, I still didn't have good pressure, so I wanted to change the regulator and I had to start over 4 times, no way to place this regulator with the o-ring correctly each time it leaked through the o-ring.
After the last time, I no longer see a leak through the o-ring but as soon as I turn on the ignition the pump runs for 2 seconds, the pressure rises to about 20 psi and drops back to 0 directly as if there was still a leak but I don't see one.
Any ideas?

 

[rusty ol ranger]

After changing the fuel pump and filter, I still didn't have good pressure, so I wanted to change the regulator and I had to start over 4 times, no way to place this regulator with the o-ring correctly each time it leaked through the o-ring.
After the last time, I no longer see a leak through the o-ring but as soon as I turn on the ignition the pump runs for 2 seconds, the pressure rises to about 20 psi and drops back to 0 directly as if there was still a leak but I don't see one.
Any ideas?

Prime the pump a few times (by cycleing key) and start pulling spark plugs to see if any are wet. You may have an injector stuck open.

 

[Momohenri]

I will test this as soon as possible, thank you.

 

[Momohenri]

OK, I still had a leak at the pump outlet. It's fixed, but when the engine is running, the pressure stays at about 25 psi.
The engine runs for about 3 minutes and then stops for no reason and won't restart. I have to wait for it to cool down before it restarts. Any ideas?

 

[rusty ol ranger]

OK, I still had a leak at the pump outlet. It's fixed, but when the engine is running, the pressure stays at about 25 psi.
The engine runs for about 3 minutes and then stops for no reason and won't restart. I have to wait for it to cool down before it restarts. Any ideas?

25 is low.

When it dies...try cycleing the key and see if you hear the pump running.

If its not....then its a relay, shitty pump, or possibly the ECM. I would also verify there is 12 volts getting to the pump

 

[Momohenri]

I will test the voltage tomorrow, since then I have done another test, the engine ran for 3-4 minutes and it stopped, looked at the codes in memory and there was code 86 Adaptive fuel limit reached rich , a fuel mixture problem? if so how to solve this problem?

 

[SenorNoob]

That code could be set because the fuel pressure is low. It just means that the computer has adjusted the injectors as much as it can trying to get a good signal from the O2 sensor(s).

 

[Momohenri]

I forgot to say that the pressure drops to zero in a few seconds, yet I checked everywhere for any leaks, even in the vacuum lines.

 

[rusty ol ranger]

I forgot to say that the pressure drops to zero in a few seconds, yet I checked everywhere for any leaks, even in the vacuum lines.

Try the first test i told you.

 

[Momohenri]

Ok, I tested the voltage at the pump, I have 11.9 for the two seconds without starting the engine, 12.4 after starting so it's good voltage-wise.
However, as I said above, the pressure immediately drops back to 0 as soon as I turn off the ignition as if I had a leak but I don't see one anywhere, could there be a non-return valve that no longer works or something like that?

 

[john paulson]

After changing the fuel pump and filter, I still didn't have good pressure, so I wanted to change the regulator and I had to start over 4 times, no way to place this regulator with the o-ring correctly each time it leaked through the o-ring.
After the last time, I no longer see a leak through the o-ring but as soon as I turn on the ignition the pump runs for 2 seconds, the pressure rises to about 20 psi and drops back to 0 directly as if there was still a leak but I don't see one.
Any ideas?

 

[Terrys87]

I have a 2.9 and went thru a couple of Pressure Regulators before getting a good one. These parts we are getting now a days are junk. Does it smell flooded? I wonder if you could have an injector stuck open? Otherwise I dont have any other ideas.

 

[rusty ol ranger]

There is a check valve for the fuel system that is supposed to stop fuel drain off after shutdown....but i believe its part of the regulator.

You could of possibly got a bad regulator...espicially since you had so much trouble getting it to seal (ive never had an issue, pop it in, bolt it down, done).

But i would really prime and pull plugs first.

 

[Momohenri]

by pinching the regulator return, the pressure remains so it is indeed the cause. If I had to try several times before being able to put the new regulator it is because it is slightly different, when you try to push it in the small o'ring seal goes up where it should not go. The original regulator was a bosh which was original since 1988 but we can no longer find the same reference, I ordered another one with a slightly different reference but with the same pressure, I hope this one will be good