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  1. #1
    Part of the furniture ajvx01's Avatar
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    Default 304 fuel system advice.

    Hi all,
    Just after some advice on fuel system design.
    Motor will be a stock 304, baby cam and vortech blower on around 10psi.
    I'd like to have a bit of head room in the system as eventually the plan is to push 12-14psi.

    Currently my fuel system plan is:
    - Stock lifter pump (I'm using the VN 90L tank the car has)
    - Bosch ev14 injectors (47Ib)
    - 3L surge tank under car with external pump.
    - 1/2 inch fuel line with 3/8 return (is this OK?)

    That's as far as I got.. Can anyone fine tune the set up and recommend the missing parts?
    End power goal is 250-300rwkw ..

    Thanks in advance.

    Sent from my MHA-L09 using Tapatalk
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  2. #2
    Part of the furniture monaroman76's Avatar
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    Default

    Quote Originally Posted by ajvx01 View Post
    Hi all,
    Just after some advice on fuel system design.
    Motor will be a stock 304, baby cam and vortech blower on around 10psi.
    I'd like to have a bit of head room in the system as eventually the plan is to push 12-14psi.

    Currently my fuel system plan is:
    - Stock lifter pump (I'm using the VN 90L tank the car has)
    - Bosch ev14 injectors (47Ib)
    - 3L surge tank under car with external pump.
    - 1/2 inch fuel line with 3/8 return (is this OK?)

    That's as far as I got.. Can anyone fine tune the set up and recommend the missing parts?
    End power goal is 250-300rwkw ..

    Thanks in advance.

    Sent from my MHA-L09 using Tapatalk
    I'd just use a good old Bosch 044 (make sure it's a genuine). Use the same size return line as the supply, stick with 3/8" for both, that will be fine. Only other thing you'll need is a 10 micron filter before the injectors and it would be recommended to have a 100 micron before the main pump.
    Any good quality bypass fuel regulator will do the trick, just make sure it is a 1:1 rising rate regulator as it's likely the tuner will prefer this.

  3. #3
    Part of the furniture ajvx01's Avatar
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    Default

    That's great feedback thanks.
    A mate is telling me I need twin 044's? His theory is they will work less and if one fails the other will handle the load..? He's a jap car boy but it makes sense to me?
    I'll admit I have no idea on this though..

    Any input?

    Sent from my MHA-L09 using Tapatalk
    willing to do domestic/commercial electrical work for car parts/panel work.

  4. #4
    Part of the furniture gtrboyy's Avatar
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    Default

    Twin 044's from surge tank will do the trick if fed from the vl/vn efi intank...will be noisey & you'd want to make sure surge tank is full but decent size.

    For my vp ute just going to use Walbro or DW intank,whatever 60lb injectors + fpr the tuner recommends with factory fuel lines (7/16?)

  5. #5
    Part of the furniture monaroman76's Avatar
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    It doesn't make sense that they will "work less". Regardless of whether you have one or two pumps, each pump is going to supply its maximum rated flow at whatever fuel pressure you choose to run. Two pumps will recirculate a lot more fuel back to the tank as the engine won't require nearly as much fuel as they can provide. As for having redundancy in case one fails, I guess there is some logic to that, but with good quality parts (genuine Bosch pump) the likelihood of failure is very low. I'd personally save my $250 on the second pump and spend it elsewhere.

  6. #6
    Part of the furniture monaroman76's Avatar
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    Quote Originally Posted by gtrboyy View Post
    Twin 044's from surge tank will do the trick if fed from the vl/vn efi intank...will be noisey & you'd want to make sure surge tank is full but decent size.

    For my vp ute just going to use Walbro or DW intank,whatever 60lb injectors + fpr the tuner recommends with factory fuel lines (7/16?)
    Factory fuel lines are 5/16"

  7. #7
    Part of the furniture ajvx01's Avatar
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    That makes sense regarding the extra fuel returning.. My biggest issue with the 044(s) is the noise level as mentioned above. I've only been around 1 car with them and they sound like mosquitoes imo.

    Is there a quiter option on the market?

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  8. #8
    Part of the furniture gtrboyy's Avatar
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    Intanks are worth the hassle dude

    Adding one of these to next early girl vk efi tank,a drain bolt,some extra baffling & set fuel pickup lower in tank....surging can become an issue when fuel is low.

    https://www.efihardware.com/products...rge-tank-steel

  9. #9
    Part of the furniture ajvx01's Avatar
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    That's why I'm keen to run a surge tank with an external pump, I've had surging issues before with the 90L tank.. I'm not keen to have them when under boost..

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  10. #10
    Part of the furniture ajvx01's Avatar
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    Has anyone used the dw350iL pumps? Apparently they are the modern upgrade to a 044?

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  11. #11
    Sure why not? 76lxhatch's Avatar
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    EFI systems don't need such massive lines due to the higher pressure. Plus the return line can be a size smaller with EFI due to the pressure drop (feed is ~45psi, return will only be a few psi unless you really choke it down), not quite the same as a carb system.

    3/8" feed and factory 5/16" return would be enough but if you want to go overkill then what you have won't be inadequate that's for sure. If you actually need them then you're going to need a much bigger pressure reg too.

  12. #12
    Part of the furniture ajvx01's Avatar
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    That Makes sense.. I'm thinking I'll still with the fuel line sizes as it won't hurt and will be future proof. Plus correct me if I'm wrong, but starting from scratch the cost difference would be minor?

    The real question / issue I have is the pump it seems..

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  13. #13
    Not the Kingswood! hq308's Avatar
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    If you were to run twin pumps make sure you run check valves so if one pump was to fail the pressure from the other pump doesnít get lost through the faulty pump. I would also run the 2nd pump off a pressure switch so it only comes on under boost. Two 044 pumps running constantly will not only be noisy but will be putting a lot of heat into the fuel.

  14. #14
    Part of the furniture ajvx01's Avatar
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    That's a good idea. Thanks.

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  15. #15
    254RWHP boat anchor EVL253's Avatar
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    a mate had when his was a vortech blown stocker a walbro intank pump feeding a 3L surge and single 044. it done the job fine. you wont need twin 044s. he added a second 044 when he went 355 turbo E85. and the twin 044's kept up over 600rwhp on E85. the walbro intank couldnt keep the surge full however
    11 second E85 bottle fed boat anchor

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