1g Fuel Not Priming?

Help needed please

A little while back I replaced my fuel pump (Walbro 190l). Since then the car has a hard time starting after its been sitting.

I thought that the fuel filter might be be causing this, since its the only thing that I have not replaced.

The car turns over with ease, but you can tell / feel that the fuel pump is not priming.
Once the car starts its fine, start every time.

Before I replaced the fuel pump, I had the fuel pump rewire kit. I had removed this setup because I was trying to sort out my fuel issue at the time.

Could the factory harness be causing the hard start?

What are your thoughts?

The metal tube on the fuel pump housing assembly is not sealed properly against your fuel pump. Fuel pump o-ring is the culprit.

Ahh...I will check this out later after work.
Thank you will post my findings.

Well I could not wait till after work...took everything apart during my lunch.

Where the metal tube and the fuel pump meet...it was not sitting level as it should. Just like Reza noted above.

Found a pcs of non-conductive / fuel reistant block of plastic at work. Cut to fit under the metal tube, and secured it to the fuel pump. Now the metal tube and the fuel pump are sitting level.

I will find out after work if this ends up working.

UPDATE:

Repair was completed around 1pm today.
Left work @ 7:30pm and the car started up as normal.

The next test will be tomorrow morning after the car has been sitting over night.

What Reza is referring to is an o-ring which seals the outlet tube of the pump to (what eventually becomes) the fuel feed line that goes to your rail. If this seal is not sealing properly (for whatever reason) it should be fixed.

The thing is, that when the engine is running and your pump is putting out full pressure, if a little bit leaks out, because the pump generally delivers much more fuel than is actually used, if a bit leaked out (and it would be an internal leak, back into the tank) you'd never notice or care.

When your car sits for a long time, the fuel in the rail and lines can "leak" (again, an internal leak, so you can't see it) past the o-ring seal and back into the tank. So the next moring when you start up, the lines and rail must once again be re-filled (the "priming" you speak of).

Also, when running with mods that require more than stock amounts of fuel, the little bit that leaked past the o-ring that was not a concern because it was "extra", can suddenly become a concern when it is no longer extra, but actually required.

The point is, it's never a GOOD thing to have a leak at that seal. Even if fixing that seal doesn't cure your problem (you could have more than one culprit causing your condition), you should still definitely fix that seal.

I understand what your saying Paul.

After putting the piece of plastic under the metal fuel line that connects to the fuel pump the car starts every time with out issues.
The car has been parked since Friday around 6pm till a few minutes ago. The car started up as normal.

I will continue to monitor this and see if anything changes.

It's been 4 days and the car still starts up as it should.

Later this weekend I will pull the fuel pump unit out and take a few pictures as to what I did.

I suppose I should mention that the post I made a few posts up was not to point out that you were doing something wrong or some such. It was mainly an informational post for the Board as a whole. The problem of not having a "primed" fuel system is fairly common. The root cause and root solution is not so widely known. Also, since the leaking o-ring can have problems other than just the non-priming issue, I wanted to give the full writeup. That helps explain why the post seems unnecessarily long and overdetailed. Hope you don't mind.

Paul...no problems at all. That would of been my next post as to "what else I should check" if the fuel pump was not at fault.

Good write up.

10 days have gone by and the car starts up just fine.
Thanks for the space.