YAGMTBIIQ! (Yet Another GM TBI Ignorant Question)

Joined
Jan 10, 2005
Messages
134
Location
Mt Vernon, IN and Monterey, CA
OK, I have been chasing Gremlins (demons, not the cars) in my GM TBI converson on my 2F for about 4 years now - on and off of course. Today I dropped in another TBI unit to see if that would help. The cruiser started and idled just fine - finally! But then my brother noticed that the high pressure line had a leak. We cut the engine and I tightened the hose clamp that had loosened during the TBI install and let the gas evaporate - I was ready to go for a drive! BUT, now that the fuel leak was fixed I had the same lousy/non idle that I've been fighting for so long.

Sooooo, here is the latest ignorant question of the day. There are two fuel fitting on the 4.3 TBI. One has a larger fitting and takes a larger pipe, the other is obviously smaller. I've never had any instructions and have never owned a GM TBI vehicle, so I assumed that the larger line/fitting is the intake and the smaller line is the return. Now I am second guessing that decision. Anyone know for sure???


TIA
 
Joined
Mar 12, 2002
Messages
160
Sounds like your pump is putting out too much presure causing more fuel to enter the intake with each pulse of the injectors and flooding the engine.
 
Joined
Jan 9, 2004
Messages
1,667
fuel pressure regulator? Are your injectors for a 4.3 or a 5.7? Do they have a nice aspiration pattern?
 
Joined
Feb 8, 2006
Messages
147
Location
utah
make sure your return line is not restricted also, and your fuel system should not be pressurized. both will cause it to flood. is it drivable?
 

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