Are you supposed to be able to hear a fuel flowing sound from the engine bay with the key on engine off? My car always used to make a pretty loud liquid flowing sound KOEO.

Ever since I R&R'd my engine harness, I don't hear it anymore and my car won't start.

I have spark, and fuel pressure at the hardline near the firewall, but no fuel delivery. While I was hunting down my no start problem, I cranked it over many times and I thought it was flooded. But I pulled the plugs and cranked over and it was dry.

I pulled off the primary rail and injectors to replace the oil injection lines.

What could be the problem? I'm going to look more into it today.

 

Stock, you won't hear that sound. Guys with larger fuel pumps and/or wiring upgrades will usually hear it.

You're sure you didn't swap the feed and return lines underneath the throttle body?

 

Ahhh, well I did the fuel pump rewire, so that could be why I heard it. I didn't touch the fuel lines, I just unbolted the hardlines from the motor and moved them.

I can hear the fuel pump running, and if I disconnect the feedline I have pressure.

 

wow now I'm REALLY stumped. I pulled off the primary rail and had my brother crank it over. I am getting fuel from the injectors. I am getting pressure/flow from the feedline.

But the parts that don't make sense are that when I take off the return line and have the key on, no fuel comes out. I thought this could be because there is no vacuum at the FPR. But wouldn't there still be at least some fuel that is returned? I'm going to pull a vacuum on the FPR and check again.

And now that I know I've had fuel delivery, I think I flooded the motor. I pulled the spark plugs earlier and they were dry. And I cranked over with the plugs out and the spark plug holes were dry. Wouldn't there be fuel coming out if it was flooded?

 

If you jumper the fuel pump on the diagnostic conn. and turn the key on, you should hear fuel flowing through the pressure regulator near the firewall.

The pump doesn't constantly run just because the key is on, so that's why nothing came out of the return. The FPR was holding what little pressure it had. Now, if you pulled the return line off, cut the key on, AND THEN jumpered the test connector you should get flow.

To really test fuel press, you should put a gauge on a T at the feed line near the oil filter. Then, follow the procedure in the FSM.

You should then check to see if you have good spark (or you could check the spark first, since it's easier). Then I would make sure your connectors are on.

 

Thanks for the input.

Got the car running this morning. I did the wiring modification to give the fuel pump better voltage, so it runs anytime the key is switched on. I can hear the fuel pump when it runs from under the car, so I know it was running.

I do plan on using a fuel pressure gauge on a FPR when I upgrade my fuel system.

Spark was one of the first things I checked. I grounded a plug at the battery with the plug wires hooked up, and I had good spark while cranking.

Since I knew I had fuel delivery the whole time since I pulled the fuel rail and had injection, I figured it was just really flooded. When I first put everything back together, I had the crank sensor connectors switched, and probably tried cranking it maybe 4 times, so I must have flooded it.

Cleared out all that fuel, and she fired up nicely. Runs like a champ again.