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Crank no start 1990 Chevy K1500 5.7L 4x4

Jo Ann Buchanan

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Jo Ann Buchanan New Member

Jo Ann Buchanan

Posted
Posted

I have a 1990 Chevy K1500 5.7L 4x4 pickup that cranks but wont start. I can get it to start by spraying starter fluid in throttle body but only for a few seconds. The fuel pump was just replaced in October of last year. I can hear it click on when i turn the key. I haven't checked fuel pressure because I cant afford to rent on for $160. Could my fuel pump be bad? Or fuel relay?Incidently this 350 motor is a swap I got to replace my old motor that that went bad. Truck has run since motor swap but only for a short time. Then file pump went out and I replaced it back in Oct. Any help would be appreciated.. Thanks..

riverbanks Senior Enthusiast

riverbanks

Posted
Posted

You can hear it click on,that's the relay working,with air cleaner lid off,when a helper is cranking it over,do you see fuel coming out of injectors?,wear glasses to be safe and probably need a flashlight

LDM Enthusiast

LDM

Posted
Posted
14 hours ago, Jo Ann Buchanan said:

I have a 1990 Chevy K1500 5.7L 4x4 pickup that cranks but wont start. I can get it to start by spraying starter fluid in throttle body but only for a few seconds. The fuel pump was just replaced in October of last year. I can hear it click on when i turn the key. I haven't checked fuel pressure because I cant afford to rent on for $160. Could my fuel pump be bad? Or fuel relay?Incidently this 350 motor is a swap I got to replace my old motor that that went bad. Truck has run since motor swap but only for a short time. Then file pump went out and I replaced it back in Oct. Any help would be appreciated.. Thanks..

What fuel pressure tester are you buying/renting that is $160 for a TBI motor?  You can purchase one from Harbor Freight for $25.  https://www.harborfreight.com/fuel-injection-pump-tester-62623.html

 

You need test the fuel pressure to determine if you are getting fuel to the rail or not.  The fuel pressure should be 10-13 psi on a 90 TBI.  If you have that, the fuel pump is working and I would start looking at the injectors.  If there is no fuel pressure, the pump you put in properly failed and will need to be replaced.

diyer2 Senior Enthusiast

diyer2

Posted
Posted

If you didn't buy an AC Delco of Delphi fuel pump my guess is the pump died.

:)

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