mancini/carter 4845 fuel pump.

Fuel and Air Systems

  1. lewtot184

    lewtot184 Well-Known Member

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    just did some testing of the mancini/carter 4845 fuel pump (supposed to be a 440hp replacement). i use a 440 block with a cam and fuel pump push rod installed and drive the camshaft bolt with a 3/8" 1200rpm drill. this pump spit out 2qts in 30 seconds but the dead head pressure was between 18-19psi. double checked the pressure with two gauges with only 1lb difference between them. i found the original carter 440hp pump from my '69 r/t and tested it . to my surprise it worked! it pumped 3+ qts in a minute and dead headed around 10psi. the mancini/carter had a 3/8" fuel inlet nipple with the 1/8" pipe threaded outlet. the stock pump has a 5/16" inlet nipple with the 1/8" outlet.

    it's obvious the mancini/carter (made in korea) is a no go for any stock/resto or mildly modified build without some type of serious regulator. the original pump will probably work fine in conjunction with a return line; as they were originally built.
     
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    • SlinktRR

      SlinktRR Well-Known Member

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      I've had two 4845's. Both times the diaphragm failed. Junk, imho. Rebuild the old one if you can still get kits or go quick fuel.
       
    • 68 HEMI GTS

      68 HEMI GTS Well-Known Member

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      Things are such garbage anymore. 19lbs on your Holley needle and seat when it's closed isn't gonna be to swift
       
    • lewtot184

      lewtot184 Well-Known Member

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      there's a way to use the 4845, but who wants to waste the time trying to find the proper return line orifice size. bet the orifice would have to be big.
       
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