Stock fuel lines and return question

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01-02-2005, 12:24 AM

#11

SimpleManLance

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Quote:

Originally Posted by parish8

not really sure. i think the twin set up would be better. if the 420 will flow as much fuel as twin 340m's then you will have a return line problem and too much fuel presure at idle. my set up works because the 2nd pump is staged. comes up at 4psi of boost.

how do you get the second pump to turn on at 4psi? are you doing it through ls1 edit?

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01-02-2005, 12:33 AM

#12

parish8

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no, it is just a presure switch. there is a conector up near the fuse box under the hood that you can plug into to turn on the 2nd pump. on my truck it goes to a hops switch but you could turn it on anyway you want.