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Thread: Bizarre Fuelling problem (bit of a long read, complex problem)

  1. #11
    Veteran Skylar's Avatar
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    Are you running an AJPS surge tank? From memory, the way they mount puts the tank outlet to one side and is more likely to starve when cornering one way compared to the other. I don't remember which way it was.

    Are you running the rail return to the surge tank or the fuel tank?

    Is the surge tank hot when it does this? Crazy hot to the point of vapour locking?

    And the leaks... I have no idea. Where is it actually coming from? Hairline crack in the surge tank that expands with heat and lets fuel out?

  2. #12
    Senior Member Sprinter Freak's Avatar
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    Theres a filter the screws onto the carby lift pump, that was new with pump install. Theres another one just before the engine, but is only 5000km old. Maybe your right, this pump might not be strong enough to keep the surge filled. Might see if i can borrow a pressure test kit off someone and see what its getting at the main pump.

  3. #13
    Senior Member Sprinter Freak's Avatar
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    Nah I'm just running a 2 litre in boot surge tank. That is another thing i was thinking could be happening, as its only on hard right handers it surges (when the fuel is sloshing away from the main pump.

    yea I'm running the return line from the front of the car to the number 2 barb in the picture.

    Click image for larger version. 

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    Barb 3 is the feed from the tank that the lift pump plumbs into

    Click image for larger version. 

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    Number 1 barb goes to the return line on the fuel tank

    Click image for larger version. 

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    Barb number 4(not labeled) runs in line with the main pump goes to the feed line for the engine.



    I didn't feel the surge tank to see how hot it was when i got off the track, next event i will check it out.


    I found out what the leaking was coming from, there was a small split right at the end of the breather line for the tank. Couldn't see it till i dropped the tank, so no more leaks

  4. #14
    Senior Member Sprinter Freak's Avatar
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    Heres a video of the what type of noises the pumps are making, to me they don't sound right. Right at the start as i get close to the main pump is sounds like it cavitates for a second.





    What Lift pumps is everyone running? What psi rating are they to and how many litres per minute do they flow?

  5. #15
    Senior Member Sprinter Freak's Avatar
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    Im using one of these as a lift pump, paired with a bosch 070 main pump


    Supposed to do 132 litres per hour and up to 7 psi, is this too small?


    Also been reading into vapour lock, could it be possible the 070 is too powerful for the standard fuel pressure regulator? would getting rid of it and going a sard adjustable unit possibly help?
    Last edited by Sprinter Freak; 23rd September 2014 at 12:26 AM.

  6. #16
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    Disconnect the vacume line off your pressure reg to test it. Idle should be effected
    Ae86 Drivingclub - Toyota AE86 Car Club where AE86 | KE70 | Toyota 86 / GT86 | Subaru BRZ | Scion FRS owners

  7. #17
    Senior Member Sprinter Freak's Avatar
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    i swapped it out for a sard adjustable one, just incase the high fuel pressure was putting strain on the pumps. Seems to run better with the adjustable one, not sure whether it will fix the surging problem, will just have to try it out and see.

    But surprisingly i couldn't get it to anywhere near stock fuel pressure with the sard FPR. Stock fuel pressure for 4age's varies from 35psi to 38psi, the gauge on the FPR was sitting at 300kpa/43.5psi and i couldn't get it to sit any lower no matter how much i adjusted it.


  8. #18
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    Possibly a blocked / restricted return line . Run the return into a jerry can as a test
    Ae86 Drivingclub - Toyota AE86 Car Club where AE86 | KE70 | Toyota 86 / GT86 | Subaru BRZ | Scion FRS owners

  9. #19
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    Pressure don't mean shit without flow. You can have a restricted line and still have good pressure but fuck all flow.
    You can have any brew you want... as long as it's a Datsun / Corolla / What is that?

  10. #20
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    Could be, will give that a go and blow out the lines incase theres any muck in them.

    yea true psi isn't a measure of how much flow there is.

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