Fuel Pump Pressure please
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  1. #1
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    Fuel Pump Pressure please

    Hello again. I'm thinking of converting from a original, mechanical fuel pump to an electrical one. Could one (or all) of you clever lot tell me what pressure the pump needs to be please. I'll probably go for a pump mounted near the tank.
    The engine is a 2.6 Straight six with a standard Zenith carb and a three speed 'box.

    Thanks in advance.

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    I'm no expert, but i've usually used 4 psi on most things with carbs.
    Its no good in the garage, Drive it!

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    Semi Proffessional Prat sidspop's Avatar
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    Standard ticker pump off Morris Minor and similar. I have same engine, albeit minus two cylinders, and it feeds it fine. Mount on mini exhaust bobbins to quieten it down a bit.
    Its either you lay down and die or you get on with your shit till you do!!!!! No Other Way Around It. One or the other. Don't worry about being forgotten, you will. Rather worry about in how long it will take for you to be forgotten, bro.

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    Off the Xmas card list kapri's Avatar
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    It's really based on fuel bowl capacity and float volume vs needle plus overall BHP made. Webers need 3psi min, Holleys generally about 5 psi max. Morris Thousand is 1.5psi and MGB 2.5. I powered 110 bhp on a 2.5psi and it leaned out on top end but switching to 3 psi cured it. So looking at power output I'd be going with a 3 psi pump.

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    Thanks all. Much appreciated as always.

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    Quote Originally Posted by kapri View Post
    It's really based on fuel bowl capacity and float volume vs needle plus overall BHP made. Webers need 3psi min, Holleys generally about 5 psi max. Morris Thousand is 1.5psi and MGB 2.5. I powered 110 bhp on a 2.5psi and it leaned out on top end but switching to 3 psi cured it. So looking at power output I'd be going with a 3 psi pump.
    sounds ok except the holley recommendation kev. i've used facet red tops on holleys for years and they're 6.5 psi. never had an issue.
    need a job done on your project? i may be able to help.

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    Off the Xmas card list kapri's Avatar
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    Quote Originally Posted by mygasser View Post
    sounds ok except the holley recommendation kev. i've used facet red tops on holleys for years and they're 6.5 psi. never had an issue.
    We can all only recommend on experience Neil I've found that over 5psi when ticking over for a long time ,say in traffic, they slowly start to overflow into the venturi . As for my mates Holley with an unregulated Jag SuU pump ( which turned out to be 9 psi ) that would tick over for about a minute and then start to belch black smoke

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