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    Anyone using a fuel pump to pull fuel from top of fuel cell and use busa stock relay?
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    Well, I wish mine was gravity fed but its not. I dont think most pumps really like to pull fuel ... they like to push fuel, or is this incorrect? I have an MSD external fuel pump that sits on top of my fuel cell essentially ... it thus has to pull fuel up anywere from a couple inches to a good foot or so as the tank gets close to empty. Note too its only a three gallon fuel cell so even with my foam and multiple pickups in the tank I suspect its fairly easily starved sloshing around(the walbros prevent it from sucking air) and I am often low on fuel LOL. My pump claims to be a low draw 5.4 amps but I assume it potentially draws more pulling fuel rather than pushing and probably gets worse if starved and thus perhaps getting hot and further complicating things. Just curious as I have a theory with using stock relay that perhaps this is a source of ultimetly killing ECUs since the fuel relay supplies the injectors and coils too. Do I need a special pump to pull fuel or maybe I will just put in another relay to further isolate the fuel pump draw. Or am I way over thinking this LOL. What does a stock busa pump draw out of curiosity or what setup do most use for electrical to the pump?
    Last edited by twvette; 05-17-2012 at 10:45 PM.
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    Re: Anyone using a fuel pump to pull fuel from top of fuel cell and use busa stock re
    #2
    Vendor yoshi's Avatar
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    I run a fuel cell that has the pickup at the top. I located the fuel pump below the gas tank so there is always fuel in the line going to the fuel pump since there ends up being about 2 foot of line and most of it will still hold fuel even when the pump is not being used.
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    Re: Anyone using a fuel pump to pull fuel from top of fuel cell and use busa stock re
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    Having the pump sit on top the tank is not a problem.

    You all ready know the 3 gal tank is a problem.

    Why not use the wire going to the pump to trigger another relay so theres no real draw on that wire.
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    Re: Anyone using a fuel pump to pull fuel from top of fuel cell and use busa stock re
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    Intense Moderator Rat4020's Avatar
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    Quote Originally Posted by MC@ Performance Fab View Post
    Having the pump sit on top the tank is not a problem.

    You all ready know the 3 gal tank is a problem.

    Why not use the wire going to the pump to trigger another relay so theres no real draw on that wire.
    I think thats exactly what I wanted to hear MC...
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    Re: Anyone using a fuel pump to pull fuel from top of fuel cell and use busa stock re
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    OK to take it another step I use the wires from the ecu to trigger automotive relays for both my fuel pump and radiator fan.
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    Re: Anyone using a fuel pump to pull fuel from top of fuel cell and use busa stock re
    #6
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    Thanks. Gonna add another relay.

    Do you think the original stock realy might have already been damaged? Remember I am burning up ECUs but we think now this is a bad injector as it only burns out once cylinder channel. However, I am paranoid now so wondering if that relay is now bad and thus sending spikes to the ECU as it feeds the injector/ignition channels also. Replace with a stock relay? Having a hard time finding one bdown locally ut could order ... or should I just replace with a off the shelf relay as it appears to be a four standard pin relay anyways?
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