fuel mixture question!!!

[Stainbox12]

a while ago, i installed a walbro 190 pump.. i have a 16g and RC 550CC injectors recently cleaned.. my car does take a while to start with the new pump, and it didn't with the stock one. When i unscrew the banjo bolt on my fuel filter, gas comes out, but it doesn't spray like its supposed to, So this makes me think there's lack of good fuel pressure. Im going to rewire soon, and see if its helps any. But yesterday while i was boosting, my car began missfiring really bad, and i saw some flames coming out from my exhaust. I had to change the CAS because apparently it burned. I checked my plugs and the one closest to the timing belt looks kinda corroded and a little white. All the other ones look brownish and they have that particular gas smelling. I know i need a safc to tune, but i thought that i would be running rich with a 16g and 550CC. Ill try to post a log tomorrow, but in the meantime, any suggestions?

 

[JayRolla]

So are you running with the injectors and no way to compensate. If so that is the problem. If you run too rich and dumping fuel the cat can fill full of fuel and ignite. I would take the injectors out know. Without fuel control it will never run right.

 

[Stainbox12]

I understand... but what about the fuel pressure? i think im lean though..

 

[steve]

it's not uncommon for the o-ring sealing a walbro pump to the fuel line to not fit properly and leak. After checking the fuel pressure with a gauge to verify my base pressure and that the regulator tracks manifold pressure I'd pull the pump and inspect it if I was having a problem.

I wouldn't drive the car with 550cc injectors and no corrections.

Steve

 

[FORMONTOYA]

I agree with Steve..............very common for the o-ring in the pump hat to not seal properly. The o-ring that came with mine was too large on the ID and didn't seal properly allowing the fuel pressure to drop off quickly, down to 0PSI in about 10 minutes, and taking an extra couple of "cranks" to get it fired up.

Pulled the pump and found out that I actually twisted the o-ring and replaced it but it didn't really solve the issue. Pulled the pump again and actually looked at the o-ring and concluded that (on mine) the o-ring ID was to large........sized the o-ring to the pump hat "shaft" and "cap" and now the pressure holds for several hours before falling to 0PSI.

Car starts normal now.

On o-rings, I use di-electric silicone grease for lubrication.

 

[Stainbox12]

thats the whole point. I forgot to mention, that im not using an o-ring. Im using a fuel hose in between the housing and the pump. It should hold pressure fine, but it takes a while to crank. Maybe i need a rewire?

 

[steve]

It shouldn't take any time to come up to pressure even on stock wiring.

Start thinking of ways to test things out. Don't assume anything is good. Assume it's all bad and start proving to yourself that it is good.

Just because you used a hose don't mean the clamp hasn't come loose, or your wiring to the pump is causing extra resistance, or even the pump could have gone bad.

Steve