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    1. · Premium Member
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      Discussion Starter · #33 ·
      Another late update.

      Problem FINALLY solved!

      First I tried a mallory 140 gph elecrtric fuelpump but it only lived one hour new out of box before it failed and mallory was very hard to deal with worst customer support I have ever had deal with!

      So decided to try a mech fuel pump again and went with a Holley 454-20 http://www.holley.com/12-454-20.asp this time instead of the old carter 172 gph. Very pleased with this Holley pump so far, still using the insulater between block and pump and most of the other things I tried earlier but removed the foam on the hose between the pump and carburetor. Instead of a regulator I decided to use a vapor return at the end of my carb fuel line tapped it for 1/8" npt and drilled a .050 hole in a brass npt plug and runs a return line to the tank. It gives me 6-7 psi at idle and 8 psi on highway no matter how hot it is or how long I have the car idle. Also replaced my homebuilt fuel sending unit with a RobbMc unit and the pressure is much more stable under acceleration not sure if it is the pump or sending unit? Im very pleased that I finally after 5 years has solved this problem.

      Marcus
       
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    1. · Premium Member
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      I like my holley 12-454-20 I dont use a regulator but a idle bleed return so the pressure is 6.5-7 psi.
      http://www.holley.com/12-454-20.asp
      I actually replaced a carter 172 gph that never showed more than 2-3 psi under hard acceleration the holley stays around 6 psi under acceleration. Since a couple of years Carter doesnt make their non billet 172 gph pump anyway.

      If electical the holley hp 150 or their in line pumps is nice.

      Marcus
       
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    1. · Premium Member
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    1. · Premium Member
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      These Holley pumps look sort of cheap lately....I wonder if they are now, or were always, made overseas? I know mine looked like a cheap Ebay copy when I first bought it.
      The regular 12-454-20 are made in Korea mine has worked without a problem since 2010. I also belive its dold under Jegs brand?
      https://www.holley.com/products/fue...s/carbureted_mechanical_pumps/parts/12-454-20

      The 170 billet I belive is made in Us but is more $. I really like the billet version will probably end up eith one.
      https://www.holley.com/products/fue...s/carbureted_mechanical_pumps/parts/12-454-25
       
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      The regular 12-454-20 are made in Korea mine has worked without a problem since 2010. I also belive its dold under Jegs brand?
      https://www.holley.com/products/fue...s/carbureted_mechanical_pumps/parts/12-454-20

      The 170 billet I belive is made in Us but is more $. I really like the billet version will probably end up eith one.
      https://www.holley.com/products/fue...s/carbureted_mechanical_pumps/parts/12-454-25
      That bottom Billet one you posted is the one i have. Works great...no regulator.
       
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