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  1. #31
    Part of the furniture ajvx01's Avatar
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    The issue is I've had it starve for fuel during heavy cornering and braking etc, and I don't want this to happen under boost.. Hence the surge tank. I get what you are saying though, it's not truly necessary these days.
    My question is though, would it work? I have all the fuel lines and surge tank etc, I only need to purchase the pumps..

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  2. #32
    Sure why not? 76lxhatch's Avatar
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    Yes a surge tank will work fine if properly set up, I thought you meant lift pump without a surge tank.

  3. #33
    Part of the furniture ajvx01's Avatar
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    Ah OK, no I mean if I get a lift pump that out flows my hi pressure pump would it be safe to have the efi return line go to the main tank?

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  4. #34
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    Yeah logic tells me to run the fuel reg return to the surge and the surge return to the tank, so the lift pump has less work to do seeing as its not as efficient, to keep the surge full unless you went overkill on your lift and used the 525...Maybe try just the ONE 044 external?? But Id still go 1/2" on the return and 3/8 on the feed.. I honestly think the reasoning is that efi relys on pressure rather than volume, 2 x 044 pumps drained the surge, and the lifts not up to doing its job.....and the reg returns straight to the tank rather than to the surge where it should be and therefore no sufficient line pressure for the injectors??
    ..

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  5. #35
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    I would run return to surge, then surge return to tank. That will stop starvation.

  6. #36
    Part of the furniture ajvx01's Avatar
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    Quote Originally Posted by Castiron355 View Post
    I would run return to surge, then surge return to tank. That will stop starvation.
    My concern is it will create hot fuel though?

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  7. #37
    Do you ever leave? immortality's Avatar
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    You should be fine with a single 044 pump. Running twin pumps could get interesting which is why it was suggested to run the 2nd pump on a switch so it only comes on with boost.

  8. #38
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    Fair call. Then you need to know how much fuel Ďallí injectors will flow, full open, at full boost. Calculate in litres per minute or GPH. Then as long as your lift pump and pressure pump flow more, you canít starve for fuel running a return back to main tank. In this case your return must be the same size as your feed line.

  9. #39
    Part of the furniture ajvx01's Avatar
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    Quote Originally Posted by Castiron355 View Post
    Fair call. Then you need to know how much fuel Ďallí injectors will flow, full open, at full boost. Calculate in litres per minute or GPH. Then as long as your lift pump and pressure pump flow more, you canít starve for fuel running a return back to main tank. In this case your return must be the same size as your feed line.
    Thanks mate. I reckon that will be the go.

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  10. #40
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    Sorry, I should also mention the pumps need to flow 2 to 21/2 times (I think) the total injector flow to maintain correct rail pressures.

  11. #41
    Part of the furniture ajvx01's Avatar
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    Quote Originally Posted by Castiron355 View Post
    Sorry, I should also mention the pumps need to flow 2 to 21/2 times (I think) the total injector flow to maintain correct rail pressures.
    Good to know!

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  12. #42
    Sure why not? 76lxhatch's Avatar
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    Quote Originally Posted by ajvx01 View Post
    Ah OK, no I mean if I get a lift pump that out flows my hi pressure pump would it be safe to have the efi return line go to the main tank?
    No, don't do that. If you insist on running the return back to the main tank, build a suitable in-tank setup. If you want a surge tank, use it properly.

    I'm not sure where the idea of overheating fuel came from, unless you have it cooking above a very hot exhaust you'll struggle to heat up 1L+ of constantly moving fuel. (Not really comparable to a tiny carb float bowl sitting on top of an engine, and they do fine most of the time).

  13. #43
    Part of the furniture ajvx01's Avatar
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    Fair comment on the fuel in a carby.. I've Only ever been told that the surge tanks get ridiculously hot when driving on a hot day due to everything around them being hot and the pumps hate it. I'm probably over complicating things but I like to think ahead.

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  14. #44
    Part of the furniture monaroman76's Avatar
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    Quote Originally Posted by Castiron355 View Post
    Sorry, I should also mention the pumps need to flow 2 to 21/2 times (I think) the total injector flow to maintain correct rail pressures.
    I'm not sure where you got this idea, but this is not the case. This would imply you need fuel pumps capable of delivering 1000-1250 HP worth of fuel to support an engine making 500 HP! As long as your pump flows more than the injectors are delivering at maximum engine demand, you will maintain fuel rail pressure. Of course it is only logical to add a small buffer on top of this.

  15. #45
    Part of the furniture monaroman76's Avatar
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    Quote Originally Posted by 76lxhatch View Post
    No, don't do that. If you insist on running the return back to the main tank, build a suitable in-tank setup. If you want a surge tank, use it properly.

    I'm not sure where the idea of overheating fuel came from, unless you have it cooking above a very hot exhaust you'll struggle to heat up 1L+ of constantly moving fuel. (Not really comparable to a tiny carb float bowl sitting on top of an engine, and they do fine most of the time).
    Yes exactly! Not to mention the lift pump is constantly adding "cool" fuel from the main tank into the mix.

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