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crank and no start

Sutton David

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Sutton David New Member

Sutton David

Posted
Posted

99 yukon 5.7 complete tune up and i mean complete coil and all, fuel filter. pump , spider injectors, all 02 sensors. crank sensor. temp sensor. mas, and runs good for 2 days after each change and same thing happens. full crank and no start. today i decided to just check the pressure not with a tester sadly. but no pressure at all. none no squirt or drip. does this each time. totally lost with it. getting costly to shoot in the dark. and 2 mech have messed up by saying for sure it is the spiders and pump. and nope it is not.

I just went out to well put some gas into the throttle body intake and it started and ran till that was used up . my attempt to see if it would prime itself. no go. did get a slight backfire so stopped. was not much fuel i put in .

CamGTP Senior Enthusiast

CamGTP

Posted
Posted

You need to test for power at anything fuel pump related.

 

So does it have power at the relay, power at the pump connector and that type of thing. Check the fuel pump fuses if there are any.

 

So if the relay checks out and you have power to the connector, the pump is going to likely be bad.

SILVER SLED Senior Enthusiast

SILVER SLED

Posted
Posted

Based on history of these vehicles, and it running on gas you put down the injector, my money is on a bad fuel pump.  Did you go with a genuine GM pump or an aftermarket pump?  Aftermarket fuel pumps for those trucks don't seem to last long.  

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