Tbi injector overflowing with fuel


Asked by Feb 12, 2015 at 09:39 PM about the 1990 Chevrolet C/K 1500

Question type: Maintenance & Repair

Injector overflowing with fuel,
recently cleaned tbi system and
partially rebuilt with new o-rings and
gaskets. What could be the problem?

7 Answers


How is it overflowing? Is it spraying to much or is the fuel leaking out sonewhere?

1 of 1 people found this helpful.

Leaking over the top and partially spraying underneath along with quick dripping

2 of 2 people found this helpful.

Is it coming from the injector nozzle or somewhere else on the throttle body? It shouldn't come from anywhere no matter the fuel pressure. If it' spraying from the nozzle without the engine turning over then you need a new injector. If it's coming from somewhere on the throttle body then a gasket has failed or somehow the housing cracked.

1 of 1 people found this helpful.

Hmm- I think I have a bad injector I noticed this when I moved them to their opposite housings. Right bad injector to left housing and left good injector to right housing. This time right housing stayed dry but left leaked. I also noticed that I forgot to lubricate my larger o-rings.


The o rings cause leaks but it sounds like a leaky injector


Yeah I will replace and let you know.


Replaced the leaky injector and my truck is running better, although I did notice the engine tremble a little at idle. I also noticed rpm would slightly go down then pick back up to a good idle.

3 of 3 people found this helpful.

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