1987 CHEVY S-10 BLAZER RUNNING POORLY

  • Tiny
  • xironworker
  • 1987 Chevrolet Blazer

I have an 1987 chevy s-10 blazer with a carburated 283cid engine. Fuel pump is in gas tank. My vehicle starts running poorly and I notice my fuel pressure regulator reads 2lbs so I turn it up to 4.5lbs runs great for a few miles. Then the pressure reads 2lbs
i have to keep adjusting my fuel pressure regulator back up to 4.5lbs do you think my regulator or my in tank pump is going bad?

Tuesday, March 27th, 2012 AT 9:14 PM

8 Answers

  • Tiny
  • rasmataz
  • Member

Check the actual fuel pressure with a gauge if its within specs-

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Tuesday, March 27th, 2012 AT 9:42 PM
  • Tiny
  • Wrenchtech
  • Expert
  • 19,802 posts

If you converted that system from a return type system to a returnless using a regulator, you will just fry the pump. Those pumps aren't designed to run that way.

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Tuesday, March 27th, 2012 AT 10:48 PM
  • Tiny
  • xironworker
  • Member

What pump system do you suggest I run?

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Tuesday, March 27th, 2012 AT 11:56 PM
  • Tiny
  • Wrenchtech
  • Expert
  • 19,802 posts

It's a conversion that really should never have been attempted. It requires a different fuel tank and external fuel pump, preferably the engine mounted factory pump. These modifications aren't even legal to do.

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Wednesday, March 28th, 2012 AT 12:02 AM
  • Tiny
  • xironworker
  • Member

Thanks I will run engine mounted mechanical pump.

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Wednesday, March 28th, 2012 AT 12:08 AM
  • Tiny
  • Wrenchtech
  • Expert
  • 19,802 posts

You need a different tank first.

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Wednesday, March 28th, 2012 AT 12:09 AM
  • Tiny
  • xironworker
  • Member

Can I not just pull the pump put back the sender, then put an in line pump and a mechanical on the block. Plus the regulator?

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Wednesday, March 28th, 2012 AT 12:49 AM
  • Tiny
  • Wrenchtech
  • Expert
  • 19,802 posts

No, because the sender will no longer reach the bottom of the tank and you will have an extra line going into it. It also requires a vented tank which is illegal now. You can't just think you are going to "old school" and EPA certified car. The fines start at $2500.

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Wednesday, March 28th, 2012 AT 12:54 AM

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