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98 Suburban Starts Then Dies - Help!

dajohnguy

By dajohnguy
in Ask A GM Technician

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dajohnguy Enthusiast

dajohnguy

Posted
Posted

Greetings,

 

I have a stock 98 GMC Suburban 2500 4x4 that is driving me nuts. She sat for a little over a year. Put a new battery in her & about 2 quarts of oil, & Also about 3 gallons of fresh premium gas. Car starts then dies immediately - security light flashes for 3 seconds then turns off - so its not a passlock issue - even did a relearn a cpl of times for shits & giggles - no fix - she isnt thowing any codes on the reader whatsoever - fuel pump is pumping and swapping the fuel pump relay with another one made no difference -I've also dribbled fuel into the throttle body while having someone turn her over- no go- I suspect a sensor or something small and simple is telling the fuel pump to cut off & causing all this aggravation- I've read many posts with tons of people with the same problem but no one has a solution - I've been told could be anything from the fuel filter, maf sensor, oil pressure switch or sensor, the whole ecu, and a bunch of other things. I honestly dont have the money to buy miscellaneous parts to see which one it is. W/o any codes or money for a top mechanic I'm pretty much in the dark here. Any help or suggestions on this would be greatly appreciated as I really need to get this beast up and running ASAP. Thanks for your time -

 

JG

thegeniusguy Enthusiast

thegeniusguy

Posted
Posted

it could be an air related issue. check the air filter make sure its clean. Also take off the air fuel filter and take a look at the gas that comes out and see if its not too dirty. If its not those two things my next bet would be on the fuel pump, it doesnt have the pressure need it to kee the engine running. i believe the pressure has to be between 61-66 psi.

dajohnguy Enthusiast

dajohnguy

Posted
  • Author
Posted

thanks for the reply I really appreciate the input - air filter isnt too bad - fuel pressure is ok too until w/e it is shuts off the pump - gas doesnt look that dirty but was told by an old timer that it sure didnt smell so great- will put some sta-bil & seafoam in the tank later today to see if that makes a difference - any other ideas/suggestions?

dajohnguy Enthusiast

dajohnguy

Posted
  • Author
Posted

thanks mark probably so I got the car like this and am trying all I can to get it running ---- genius today i repulled the fuel filter & this time put a bowl underneath it to try and see what I could pour out of the filter - what came out was pretty nasty looking:

 

IMG_4302.jpg

 

i replaced filter & cleaned maf sesnor - rechecked all fuses - car still wont run - starts and then dies a second or two later - please tell me Im not gonna have to drop the tank!!!!! :thumbs:

  • 3 weeks later...
dajohnguy Enthusiast

dajohnguy

Posted
  • Author
Posted
take out the new filter, and check if its dirty, if it is, then yes you might have to drop the tank and clean it.

thanks- i pulled the new filter today & there were no major chunks or dark colored gas like the last pic I posted- also did another fuel pressure test and took a video for you guys - please let me know what you think:

 

dajohnguy Enthusiast

dajohnguy

Posted
  • Author
Posted

I've read the recommended fuel pressure is 55-65 psi - do you guys think my fuel pressure is so low that I need a new fuel pump? Please let me know as I have the tank dropped at the moment & plan to put it back up in a couple hours. I also bought an oil pressure switch out of desperation that I'll be installing later (or not per your advice). I dont know what else to do & really need to get this baby running - I'm sure someone must have had or seen a similar problem with a 98 vortec 5.7l - anything worked for you guys? - any suggestions? I'm running out of time & up for any and all recommendations - it would be truely appreciated.

 

Bless

 

-JG

ChevyTech77 Senior Enthusiast

ChevyTech77

Posted
Posted

If that engine doesn't have AT LEAST 60 psi, it isn't starting or running correctly. If you have less than that, time for a pump.

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