Runs a few miles then acts like it is running out of gas

1989 CHEVROLET 2500
200,000 MILES • 5.7L • V8 • 4WD • AUTOMATIC
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RONALD JONES
I have the truck listed above K2500 4×4 3/4 ton truck converted it to quadrajet 4 barrel carburetor new and street fire distributor which is new was running great but now goes 3 or 4 miles and acts like it's running out of gas. sits a few minutes and cranks back up then does it again. is it vapor locking?
Feb 7, 2020 at 1:46 AM
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ASEMASTER6371
  • ✓ASE Certified Mechanic
  • 52,796 POSTS
  • ASE Certified Mechanic
Good morning,

It could be. The fuel pump on the side of the motor should deliver about 7 pounds of pressure to the carburetor. If it does not, then the fuel could boil and this is the result.

Roy
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Feb 7, 2020 at 5:19 AM
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