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  1. #16
    Part of the furniture ajvx01's Avatar
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    That's great info thanks! Did the walbro do OK on the 304 set up or struggle on both?

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  2. #17
    Sure why not? 76lxhatch's Avatar
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    Quote Originally Posted by EVL253 View Post
    the walbro intank couldnt keep the surge full however
    Sounds like it was plumbed wrong, the main pump should return to the surge with an overflow return to the main tank. Would be pretty hard to keep wide open throttle for long enough to use 3L of fuel!

  3. #18
    Part of the furniture ajvx01's Avatar
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    I've been told there is benifits it running the main return to the main tank to avoid recirculation of hot fuel? This makes sense but it sounds like it would risk running low in the surge tank?

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  4. #19
    casual poster UNLEASHED's Avatar
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    Walbro now make a 525 fuel pump built to handle up to 700hp forced...and fits in tank (with hose clamps as slightly bigger motor section/ twin impellor so not quite factory fit)which will do away with 044s and surge tanks...also Id go with a 1/2" return snd stick to 3/8 in..More than enough...People think just go bigger because old carby types always used 1/2" hardline and -08an hose/ fittings.Look up "efi hardware"...
    Also look up "Aeromotive fuel system planner" a wealth of info..



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    Last edited by UNLEASHED; 01-01-2019 at 10:53 AM.

  5. #20
    Part of the furniture ajvx01's Avatar
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    Thanks mate, I'll have a sus. I'm still using the surge tank though so I'll need an external pump.

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  6. #21
    casual poster UNLEASHED's Avatar
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    Ah is she an early girl, VB VK??

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  7. #22
    Part of the furniture ajvx01's Avatar
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    Spot on mate, vc!

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  8. #23
    casual poster UNLEASHED's Avatar
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    Sweet mate! Love the earlies but getting too pricey for me already..
    Oh you're running a VN tank too you said up top just noticed??
    Ive got twin 044s and a 3l surge but did originally have a gss342 and bought a 450 THREE DAYS before the 525 came out....So now I have a whole lot of unused stuff in the shed as "spares"...
    Been in the build since 2006 and still pretty much looks crap...HOPEFULLY 2019...VP SS....

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    Last edited by UNLEASHED; 01-01-2019 at 01:48 PM.

  9. #24
    Part of the furniture ajvx01's Avatar
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    Yeah, I've had this car in storage for a while so it doesn't owe me much.
    I've got a 3l surge also, I just need to decide on the pressure pump and figure out if the factory liftwr pump will suffice..

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  10. #25
    254RWHP boat anchor EVL253's Avatar
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    yes was plumbed correctly. return to surge and surge overflow back to the tank.

    was only an issue on E85 on the burnout pad. on pump fuel no issues. the twin 044's were starving for fuel
    11 second E85 bottle fed boat anchor

  11. #26
    Do you ever leave? DR327VK's Avatar
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    I would have the return line back to the main tank! ive seen these surge tanks cooking hot! then the fuel pump dies from heat.

    That's OLD tech now days! best to have intank pumps = no surge & the pumps stay cool & last forever.
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  12. #27
    Sure why not? 76lxhatch's Avatar
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    Quote Originally Posted by DR327VK View Post
    I would have the return line back to the main tank!
    You can't do that with a surge tank unless the lift pump flows more than your high pressure pump(s) and is guaranteed never to run dry, and then you may as well delete the surge tank because its not achieving anything.

    Running the surge tank dry on the burnout pad was probably more a matter of uncovering the pickup in the main tank and running the lift pump dry, I bet all the fuel was glued to the sides of the tank with the car being thrown around.

  13. #28
    254RWHP boat anchor EVL253's Avatar
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    possibly.

    but was also there on the dyno when we switched it over from pump fuel to E85. and had to restrict the outlet from the mainline when pumping the tank out as the 2 044's pumped the surge dry even static. restricted the output so the intank could keep up
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  14. #29
    Part of the furniture ajvx01's Avatar
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    Quote Originally Posted by 76lxhatch View Post
    You can't do that with a surge tank unless the lift pump flows more than your high pressure pump(s) and is guaranteed never to run dry, and then you may as well delete the surge tank because its not achieving anything.

    Running the surge tank dry on the burnout pad was probably more a matter of uncovering the pickup in the main tank and running the lift pump dry, I bet all the fuel was glued to the sides of the tank with the car being thrown around.
    I'm considering doing this, oversized lift pump and return to the main tank. In theory it should give the best of both worlds?

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  15. #30
    Sure why not? 76lxhatch's Avatar
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    Quote Originally Posted by ajvx01 View Post
    I'm considering doing this, oversized lift pump and return to the main tank. In theory it should give the best of both worlds?
    Not really. A surge tank is to allow you to run a lift pump/tank setup that can't always keep fuel to the high pressure pump, which makes it an easy option for a retrofit where the main tank wasn't designed for EFI. If you're mucking around with tank modifications to work around this then I'd agree with DR327VK, you may as well just set it all up inside the main tank then you won't need a lift pump at all.


    Quote Originally Posted by EVL253 View Post
    possibly. but was also there on the dyno when we switched it over from pump fuel to E85. and had to restrict the outlet from the mainline when pumping the tank out as the 2 044's pumped the surge dry even static. restricted the output so the intank could keep up
    Something isn't right there, with the main pumps returning to the surge tank the only way to run it dry is for the engine to actually use all that fuel, it can't disappear anywhere else. You could manually fill a 3L surge tank and have no lift pump at all and that should be ample for a dyno pull (burnouts at full throttle for a few mins might be another matter).

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