OLD TRUCK, SWAPPED MOTOR TO A 455 BIG BLOCK, HAVING VAPOR LOCKING PROBLEMS, ANY SUGGESTIONS?

  • Tiny
  • kbyracing
  • 1975 Chevrolet Cheyenne
  • 210,000 miles

I can easily work on this truck, just a little short on time and money, any suggestions that don't involve moving the fuel line, or pushing it off a cliff?

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Saturday, September 3rd, 2011 AT 5:38 AM

3 Replies

  • Tiny
  • rasmataz
  • Member

If its actually vapor locking-seal the fuel pump area and see if it helps

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Saturday, September 3rd, 2011 AT 10:58 AM
  • Tiny
  • Wrenchtech
  • Expert
  • 20,045 posts

A true vapor lock is the fuel boiling due to being too close to a heat source. I doubt that is really your problem. It's much more common for a mechanical fuel pump to suck in air due to a porous fuel line somewhere between the pump and the tank.

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Saturday, September 3rd, 2011 AT 12:14 PM
  • Tiny
  • kbyracing
  • Member

I know exactly where my problem is, just don't have the time or money to move the fuel line, it has an electric fuel pump that I have had pressure tested, so I know it's a true vapor lock, would wrapping my exhaust manifold help? Or make my problem worse?

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Monday, September 5th, 2011 AT 7:19 AM

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