what happened while in idle ?

A

artie in miami

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I started up my 1990 Suburban 350 V8 w/ fuel injection after sitting for about a month...it started flawlessly and was idling...then it died out, and when I restart it, I must constantly pump the gas pedal to keep it running...if I stop pumping, it dies out. I thought maybe from sitting in miami that it got some water in the tank, so I added dry gas and some stp fuel conditioner that is supposed to clean fuel injectors etc...and changed the fuel filter. No change...still need to pump the gas furiously to keep it running...and it does not respond correctly to the pushing of the pedal...seems to be a delay. Any thing that I can check myself ? Any thoughts would be much appreciated. I am thinking it is fuel related...bad gas ?? Maybe I should empty the tank and refill ?? Thanks
artie in miami
 
artie in miami said:
I started up my 1990 Suburban 350 V8 w/ fuel injection after sitting for about a month...it started flawlessly and was idling...then it died out, and when I restart it, I must constantly pump the gas pedal to keep it running...if I stop pumping, it dies out. I thought maybe from sitting in miami that it got some water in the tank, so I added dry gas and some stp fuel conditioner that is supposed to clean fuel injectors etc...and changed the fuel filter. No change...still need to pump the gas furiously to keep it running...and it does not respond correctly to the pushing of the pedal...seems to be a delay. Any thing that I can check myself ? Any thoughts would be much appreciated. I am thinking it is fuel related...bad gas ?? Maybe I should empty the tank and refill ?? Thanks
artie in miami
Click to expand...

Start with the simple and clean your throttle body and EGR valve. You can also give your engine a http://www.seafoamsales.com/ treatment to clean out any carbon that's causing your issues.

Start with that and keep us posted. :D
Molson02536
 
hmm I did not think of that !

I did that on my wife's 2000 toyota camry 4 cyl last year, so I know exactly what you mean. Someone on a forum recommended that I do that because of the high mileage on the toyota...otherwise...I never would even know what it is ! Thanks...I will do that this weekend and let you know...I have a can at home that I bought online. I will let you know how it goes...thanks very much for your input !

artie
 
makes no sense ??

I looked under the hood to clean the throttle body and egr valve...it looks nothing like the toyotas that I have worked on...the 90 GMC looks like a carburator that they stuck two fuel injectors in ! I don't even know where to start with this animal...I ordered the shop manuals on ebay to help me figure this out.

a
 
most auto parts stores carry manuals , and there are videos on
you-tube that show how to use seafoam .
 
great minds think alike !!

I thought that may be a good idea and last week, I found the 1990 GMC repair manuals(for all the light trucks: R, G, V etc) on ebay (the ones the dealer uses) for $40. Hopefully those will have some flow charts that will help.
 
I would point the finger at the fuel pump. I had a 95 ford van did this exact thing. I had to pump the crud out of the pedal to keep it running. If I pumped fast enough, I was even able to get it up to highway speed to get it home rather than have it towed. Pull the fuse on the fuel pump. Start the enging with carb spray. If you can keep it running with the spray that is indicator it is the pump. Put a fuel guage on it and see what the pressure is, should be over 30 psi. If it is not, it's a pump problem. It is also a possible pump relay problem, make sure you have full voltage to the pump during the initial key cycle. You can pull the relay out and use a jumper wire to run the pump constant. If that makes the engine run fine, new relay should do the trick.
 
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