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Thread: Fuel pump to fit in-tank, ae71.

  1. #11
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    doing this currently to mine going to run

    internal high pressure pump (r31 walbro) > fuel filter > surge > external high pressure (vl pump)

  2. #12
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    Thanks for your input dude.
    yeah, i've noticed alot of people using the vl pump.
    im thinking of using a sr20 pump.. hmm decisions..
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  3. #13
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    you dont want to be using a high presure pump to feed the surge tank

    you want high flow low pressure (LIFT pump from a VL, NOT the high pressure pump)

    you want the lift pump to be MUCH higher flow than the high pressure pump, so that the surge tank is AWLAYS full.

    my advise on pumps is to get a lift pump oout of a VL/VN cmmondore (like $40) and then get an appropriately sized high pressure pump from bosh, download teh catalogue and compare the flow rates. there are some that are around 100l/h which is what you want. its only a 1.6L 4age it doesnt need 4 million litres an hour.

    just for interestes sake a standard jdm ae86 comes with a pump that pumps 80L/H.

    a VL turbo yo pump pumps around 130L/h.
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    For a single pump setup you are much better off using an in-line "dry" pump than an in-tank pump. You will get surge with either setup but a lot less if you use the standard carby pickup.
    Last edited by roadsailing; 6th July 2010 at 01:36 PM.

  5. #15
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    i was told as long you have proper overflow back from surge to tank there will be no worries. keeps fuel circulating, not just sitting there which also means it will be cooler? if not just let us know as lift pump cost next to fuck all

    sorry to hyjack

    cheers

  6. #16
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    yer it does work

    problem is though, you are just pumping the fuel around excessively for no reason. and the pumps use the fuel for cooling, so you are just heating up the fuel for no reason.

    "vapor lock" used to be a big problem in carby engines, when the fuel would vaporize in the lines, because it was hot, and the pump would cause a vacuum at the pump inlet, and the pump would cavitate and thus starve your engine of fuel. this was mainly a problem because the pump was in the engine bay, so the pump was sucking all the way from the tank (~3m).
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  7. #17
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    also low pressure pumps are cheaper, more reliable, easier to get, easier to fit, use less current, arnt quite as noisy.

    No matter how big your lines are from your surge tank chances are your going to pressurize the system with a high pressure lift pump and it will encourage more leaks and fumes through the lines.
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  8. #18
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    its just i already have an internal high pressure pump. but if people advise against it, i will buy a facet or rattler pump

  9. #19
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    i wouldnt use a facet, if you already have one then thats cool.
    i just wouldnt go out my way to buy a high pressure for the job

    i use a piersburg
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  10. #20
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    no worries so i can get away with it?

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