This topic contains 38 replies, has 6 voices, and was last updated by Profile photo of ChrisM ChrisM 4 months, 2 weeks ago.

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  • #26436
    Profile photo of ChrisM
    ChrisM
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    Member since: August 16, 2017
    Posts: 140
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    Hi All, I have a 8olt drop tank in my car and the car runs really well until i get to the last quarter of a tank then it starts to surge a little bit. dose anyone have an idea what would cause this issue?

    #26438
    Profile photo of IJ.
    IJ.
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    Member since: April 2, 2015
    Posts: 2 145
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    Slosh maybe, or the pickup might be high in the tank.

    #26439
    Profile photo of cava454
    cava454
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    Member since: February 20, 2015
    Posts: 2 047
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    Check the internal rubber return hose is still intact and connected

    #26440
    Profile photo of VRSenator065
    VRSenator065
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    • Adelaide SA
    • VR Senator LSx454 1960 Kombi (project) 1921 Nash Hot Rod (future project)

    • View build HERE
    Member since: February 17, 2015
    Posts: 4 601
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    As above, but do you mean a stock tank or custom made?

    #26442
    Profile photo of ChrisM
    ChrisM
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    Member since: August 16, 2017
    Posts: 140
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    It is a factory drop tank. I might have to remove the sender unit and check it.

    I was thinking maybe the swirl pot was the issue.

    #26702
    Profile photo of ChrisM
    ChrisM
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    Member since: August 16, 2017
    Posts: 140
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    Just an update:

    I have bought a surge tank. Last week i started to lose fuel pressure when over 1/4 acceleration. I am replaceing the walbro pump in the tank with a areoflow standard pump to use as a lift pump. Then running a Proflow 380Lph external inline pump. The surge tank is made to go under the car.

    #26705
    Profile photo of VRSenator065
    VRSenator065
    Participant
    • Adelaide SA
    • VR Senator LSx454 1960 Kombi (project) 1921 Nash Hot Rod (future project)

    • View build HERE
    Member since: February 17, 2015
    Posts: 4 601
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    Nice, I am interested to see pics of it installed.

    #26707
    Profile photo of Immortality
    Immortality
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    Member since: August 31, 2015
    Posts: 484

    ^^^  I’ll 2nd that.

    #26708
    Profile photo of ChrisM
    ChrisM
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    Member since: August 16, 2017
    Posts: 140
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    I have some pics of how they mount. I will also add photos of mine once its done.

    These tanks are meant for a VL but i have seen these mounted to a VN.

    #26709
    Profile photo of cava454
    cava454
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    Member since: February 20, 2015
    Posts: 2 047
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    Surge looks good. But the pro flow and Aeroflow fuel pumps are rubbish. I’ve seen several fail in mates vehicles

    #26711
    Profile photo of ChrisM
    ChrisM
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    Member since: August 16, 2017
    Posts: 140
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    i hope they dont fail haha. my walbro is failing atm.

    #26712
    Profile photo of cava454
    cava454
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    Member since: February 20, 2015
    Posts: 2 047
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    Genuine walbro?

    #26713
    Profile photo of ChrisM
    ChrisM
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    Member since: August 16, 2017
    Posts: 140
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    Yeah it is a genuine walbro. I started to lose fuel pressure under load

    #26730
    Profile photo of ChrisM
    ChrisM
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    Member since: August 16, 2017
    Posts: 140
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    Hi all. Just an update the surge tank is fitted. I had to cut the rear brake line holder bracket. But she’s in ready to be plumbed up.

    #26731
    Profile photo of ChrisM
    ChrisM
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    Member since: August 16, 2017
    Posts: 140
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    Here is a picture of the surge tank mounted underneath the car for anyone interested.

    #26736
    Profile photo of ChrisM
    ChrisM
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    Member since: August 16, 2017
    Posts: 140
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    Hi All.

    Thought i would do a little write up for anyone interested in doing the install. I bought my surge tank from JD Custom Automotive in Mornington Vic for $250. The surge tank is made for a VL. It fits up under the drivers side in front of the diff where the fuel filter sits.The top 3 fittings on mine are -6an and the lower one for the fuel pump is -10an. He can customize the fitting to what you need.

    The first step was to jack up the car and place the jack stands under the rear control arms to ensure your diff sits as it dose on the ground so you can ensure the tank is above the control arm height.

    The second step is to remove you fuel filter and you will need to cut out the rear brake line holder bracket and relocate once the tank is in and mounted.

    The third step is to make sure you have coldies on hand. Maybe an extra set of hands.

    The fourth step is to remove the rear seats, hold the surge tank up so all three bracket mount to the floor. This will take a little bit of fiddling. Then drill a hole for the first bolt from underneath the car . You might need a second person to help with the bolt so you can put the nut on from underneath. Once that is secure do the remaining bolts.

    The fifth step is to cut down the fuel lines to your desired  length depending on the external fuel pump and fitting you use. For mine i used 4x Aeroflow -6an 90degree 5/16th barb fittings and a -10an to -10an female coupler. I will list the part numbers that i used. The top connection is you feed from the fuel tank. the right connection when facing the flat back is for your  overflow to the fuel tank. The left connection is the return from your rail. (see attached diagram)

    The sixth step will be to wire up your external fuel pump and reinstall your rear seat.

     

    Aeroflow Fittings that i used.

    -6 to 5/16” 7.93mm – AF413-06-05BLK x4

    -10 straight coupler – AF131-10S x1

     

    #26738
    Profile photo of VRSenator065
    VRSenator065
    Participant
    • Adelaide SA
    • VR Senator LSx454 1960 Kombi (project) 1921 Nash Hot Rod (future project)

    • View build HERE
    Member since: February 17, 2015
    Posts: 4 601
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    Nice write up mate, forgot you had a live axle, gives more room.  Nice work.

    #26744
    Profile photo of ChrisM
    ChrisM
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    Member since: August 16, 2017
    Posts: 140
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    Thank you.

    Yeah but it has its good and bad being live axle.

     

    #26745
    Profile photo of VRSenator065
    VRSenator065
    Participant
    • Adelaide SA
    • VR Senator LSx454 1960 Kombi (project) 1921 Nash Hot Rod (future project)

    • View build HERE
    Member since: February 17, 2015
    Posts: 4 601
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    Yea won’t lie, I am not a massive fan of the design job Holden did on the IRS on these cars.  Massive camber change built into the design, plus the weight of the subframe, that is also prone to cracking.  I would much prefer live on mine unless of course, you have the fab skills of IJ and design your own set up from scratch :)

    #26746
    Profile photo of Immortality
    Immortality
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    Member since: August 31, 2015
    Posts: 484

    Yea won’t lie, I am not a massive fan of the design job Holden did on the IRS on these cars. Massive camber change built into the design, plus the weight of the subframe, that is also prone to cracking. I would much prefer live on mine unless of course, you have the fab skills of IJ and design your own set up from scratch

     

    Holden designed nothing, they borrowed it but removed the toe link arms it came with which only re-appeared when HSV re-introduced them for the GTS to improve traction and became standard during the VX.

    I’m not sure about the cracking issues, seems to be more prevalent in the early version, it’s not something you hear about in the later models (not that I’m aware off anyway).

     

    I’ve driven both and the IRS has it’s advantages but if you are interested in drag racing than semi-trailing is definitely the way to go.

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