tylerg

I have a 88 4runner that has a v6 3.0 out of a 93 4runner that I recently put in the truck. It is leaking fuel from the exhaust coming out of the mufflers also it wont start. I checked the fuel pressure regulator as in I put one on that I know is good, I also took the cold start plug off to see if that is dumping to much fuel in it. It will start after I let it sit for awhile but wont run right an once you hit the gas it revs up like it should then just dies. Any ideas on how to fix this problem?

Gamefreakgc

You should NOT have raw fuel coming out of the exhaust. That means either it's dumping more fuel that it can burn (meaning your engine is literally going to explode into a million pieces soon) or, much more likely, you're hooked up the vacuum and fuel lines wrong. I'd check your hoses against a diagram first before doing anything else.

Are you sure it's not water vapor?

tylerg

Yeah Im positive its not water. I put my finger in it and it smelt like gas. I looked at the vacuum lines an thought the were correct. Ill find a diagram on the internet an then check them. At first when we hooked them up the intake was full of gas an we fixed that. I was told it cold be a valve stuck open or something like that I honestly cant remember so could it be off time to?

Gamefreakgc

Intake full of gas? You're timing would have to be so far off to blow gasoline UP through the intake valve that your engine would not even run and you would have so much backfire it'd blow the intake boot off. Something is definitely hooked up wrong.

tylerg

Okay well ill defiantly check the lines. An I had problems with the timing before so I didnt know. Also when it is running sometimes it would idle up an down like from 800 to around 1200 rpm

Gamefreakgc

Yeah, that's an odd one. I would fix the fuel issue first. The fact that's it dripping out fuel is not only an issue affecting your engine, but a real danger. Any spark or very hot surface comes in contact with that fuel you've got a nasty fire on your hands!

tylerg

Yeah ima definitely fix that duo something like that doesn't happen

Gamefreakgc

Was thinking about it some more and it would be easy to accidentally hook up the cold start injector up to a vacuum hose by mistake and visa-versa. All of the vacuum hoses of the same size go straight into the plenum, which could flow back into your intake when idling or when shut off (releases pressure). I'd check those first.

Would make sense with it coming out exhaust, only one of the strokes actually fires the fuel, meaning that fuel could drip into it during the other strokes and straight out into the exhaust.

tylerg

Okay ill check that out tomorrow to. Thanks for the help an ima try to find a diagram on the internet

Gamefreakgc

This might help a little:


http://personal.utulsa.edu/~nathan-b...81descript.pdf


http://personal.utulsa.edu/~nathan-b...74layoutan.pdf