One out of two fuel injectors dumping massive amounts of gas

Asked by GuruRBKGK Feb 07, 2020 at 02:52 AM about the 1978 Chevrolet C/K 20

Question type: Maintenance & Repair

I have a 1987 Chevy Silverado R20 350 fuel injected TBI the truck is a 3/4 ton 2
wheel drive

My truck has an original 7600 miles on it it's been sitting in a garage since 1990
if you saw it you would consider it being almost brand new

Here is the issue...... I went for a ride and after a long day out the truck just shut
off I tried to start it several times and it would not fire following morning I open
the hood tried to start it I noticed where the injectors was dumping massive
amounts of fuel the other one has a slight drip to it every once in awhile these
are the following parts below that I replaced to try to fix the problem only I'm
back to having the same problem

New ignition control module
New EGR valve
New plugs wires cap rotor
New oil change
New fuel pump
New fuel pump relay switch
New dope tank switch in the cab
New battery
New coolant temperature sensor

I hope that someone can help me truck is still doing the same thing it was doing
before I put all these recent Parts on please someone help me with this
problem I took it to a garage to have it fixed they couldn't even figure it out

1 Answer


If your getting fuel spray like you say then then you may have either varnish stuck in the injectors nozzles and they both need replaced or one of the the injector drivers has shorted inside the ECM causing a full pulse on one injector. Strange why the shop couldn’t figure it out, this the old OBD 1 system and the equipment today can do both if they stayed up to date on diagnostic tools.

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