lostcause Posted April 4, 2013 Share Posted April 4, 2013 I'm putting a 12v fuel pump on a 25 Hudson Super Six with the original carb and would like recommendations on which pump to use. NAPA sells one with a 2 psi output pressure. Will that work or should I go with a 4-5 psi unit? I don't want to overpower the float. Link to comment Share on other sites More sharing options...
Restorer32 Posted April 4, 2013 Share Posted April 4, 2013 Why not just rebuild the original pump? What do you hope to gain? Link to comment Share on other sites More sharing options...
lostcause Posted April 4, 2013 Author Share Posted April 4, 2013 The car has been previously modified to a 12v neg ground system and has the old vacuum tank style fuel system. The owner wants a reliable driver/Great Race type vehicle so the fuel delivery is being upgraded. Link to comment Share on other sites More sharing options...
nickelroadster Posted April 5, 2013 Share Posted April 5, 2013 Chances are the 4 to 5 lb will overpower the float. Even the 2lb may. I would also install a variable regulator so you can lower the pressure even further if you have to. The original vacuum tank would have only been supplying 1/4 to 1/2 lb of pressure. Link to comment Share on other sites More sharing options...
sambarn Posted April 5, 2013 Share Posted April 5, 2013 If the car runs well, leave it alone. With proper use and understanding, the Vacuum fuel system is tuned for the intake abilities of the car and being gravity fed will not overpower and pressurize the carb. This pressurization causes leaks and those leaks drop down in the vicinity of the exhaust pipe. Needless to say, this is not a condition which helps with long term driveability. I have removed alll three electric fuel pumps from my 20's cars in the last few years. I had constant issues with overflow, vapor lock, dry pump from sitting and the embarassing and obvious sound of an electric pump whining away under the car.. Spent a couple hours rebuilding each stewart warner vacuum fuel tank and BAM! fuel problems fixed. Good luck with whatever you choose but gravity is the preferred method of fuel delivery to a stock 20s carb. Link to comment Share on other sites More sharing options...
lostcause Posted April 5, 2013 Author Share Posted April 5, 2013 Thanks for the feedback. I'll pass along the info and let the owner decide. Link to comment Share on other sites More sharing options...
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