I have a 1987 GMC suburban with a 350 throttle body injection. Every thing
was running fine and then one day it just stopped like it was getting no
fuel or spark. When i checked every thing i seen i was getting spark but
no fuel out of the injectors. I checked the fuel filter and seen it was
clogged. I changed out the filter and every thing started up and ran for a
minute then stopped agian no fuel. If i let it set for a couple of minutes
or crank on it then it will start and run for a couple of minutes then
stop agian no fuel. I need help i seen in the book that there is filters
at the injectors them self and that is my next step to check and clean
them but not sure after that. Please help
I checked the fuel pump and it seems to be working good. I can disconnect
the fuel line at the trottle body and i have great pressure. And if i
disconnect the fuel line at the out side of the fuel filter i have great
How are you checking the pressure? Opening the line and letting it shoot is
no indication of good pressure. With the filter plugged completely as you
said, the pump was overworked and is more than likely in dire need of being
replaced. The vintage you have is very inexpensive. Make sure you get the
pump 'sock' that goes with it. If the inline filter was that bad, the sock
shouldn't be much better...also putting way to much of a load on the pump.
Yes!!!!! i only opened the line and let it pump out and shot a great
stream out of it. i have never worked on throttle body injection before so
this is all very new to me. I bought this truck a week ago and it had been
setting for over 6 months on the oregon Coast but drove great from there
to nevada and then this problem started. I just know one minute it seems
like the injectors have fuel and then all of a sudden nothing a little
while later they have fuel agian.
So maybe your right the fuel pump is the next place i will look but the
bad thing is i just filled the tank.
It would have to be under the back of the 3rd seat since the tank is behind
the rear-end between the frame rails. I have an '89 Suburban and never saw
an access panel. Never looked for one, but never noticed one either. Worth
checking into though.
If you need anything for your 'Burban, drop me a line. I have the
'89(cargo doors) and an '85(tailgate) I am parting out...Both 4x4. Does
yours have the factory DARK tint privacy glass...I have 2 complete sets!
I checked the fuel pump and all seems good. I have great pressure at the
throttle body. I also checked at the out flow of the fuel filter and seems
to be good i can't see that the fuel pump has a issue.
Sitting still with a short test is not the same as driving for a
couple of reasons. One being that the pump gets more voltage when
engine is running and another is the fact the fuel moves around in
tank is low and can let pump get hotter. Make no mistake, you pump is
likley bad and drawing excess power when it warms up a bit and goes
into thermal protection because you do not want a hot pump in fuel
tank. Bite the bullet and replace the pump and it will fix the problem
and afterwards do not run the tank low a lot. Try to keep atleast a
1/4 tank in it for proper cooling and lubing for long pump life. A lot
of those pumps went to a earlier grave in vehicle that were run close
to "E" a lot.
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