1987 Chevy S-10 Blazer running poorly

XIRONWORKER

MEMBER
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?

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8 Replies

RASMATAZ

MECHANIC
75,992 POSTS

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

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Tuesday, March 27th, 2012 AT 9:42 PM

WRENCHTECH

MECHANIC
20,761 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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Wednesday, March 28th, 2012 AT 12:08 AM

WRENCHTECH

MECHANIC
20,761 POSTS

You need a different tank first.

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Wednesday, March 28th, 2012 AT 12:09 AM

XIRONWORKER

MEMBER
4 POSTS

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

WRENCHTECH

MECHANIC
20,761 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