It will not start just cranks

Tiny
KWOLF003
  • MEMBER
  • 1987 GMC SUBURBAN
  • V8
  • 4WD
  • AUTOMATIC
  • 55,550 MILES
This SUV has been sitting for seven years, but I got it to start after replacing the fuel filter/fuel pump/got the oil changed/air filter/spark plugs. It ran but idle roughly. Then one day I went to start it and it would not start. It just cranks. I do not know what to do now. Help please.
Saturday, February 24th, 2018 AT 1:46 AM

2 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning.

The first thing I would do is to drop the tank and have it flushed and clean from all the old fuel and debris.
Also, replace the fuel pump as well. Over the time it was sitting, the pump was filled with carbon which will restrict the operation of the pump.

Roy
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Saturday, February 24th, 2018 AT 4:43 AM
Tiny
PATENTED_REPAIR_PRO
  • MECHANIC
  • 1,853 POSTS
I see you said that you already replaced the fuel pump, so I have to ask, when you turn the key to run, before you turn the key to start, does the fuel pump even run for two seconds or not?
If not, check the fuel pump fuse and feel if the fuel pump relay clicks when you first turn the key to run.
If the fuel pump does run, check the fuel pump pressure and make sure it is 9-13 psi and if it is or even before testing the fuel pressure, check the fuel injector fuse/s.
Simply trying a few shots of starting fluid into the throttle body would let you know if it is a fuel system problem or not. If the engine starts and runs for a couple seconds with starting fluid then it must be a fuel issue, cause that would prove the ignition is just fine.
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Saturday, February 24th, 2018 AT 6:57 AM

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