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Jeep Stalls When Turning Left

Discussion in 'Intermediate CJ-5/6/7/8' started by JustJeff, Jul 12, 2022.

  1. Jul 12, 2022
    JustJeff

    JustJeff New Member

    Colorado
    Joined:
    Apr 20, 2021
    Messages:
    25
    Hey all! I've looked around quite a bit, but can't find the answer to my question - probably 'cause I don't know the name of the part that I need!

    Anyhow, my jeep is fuel injected with a in tank fuel pump. Whenever I'm below 1/4 tank, the jeep will stall if I take a left turn and then fire back up again when I get straightened out. I'm sure it's because all the gas moves to one side and the fuel pump can't get any. In other FI jeeps I've had, there has always been a little bowl or something at the bottom of the tank that acts as a baffle of sorts to keep this from happening. Anybody have a great idea for what the use - and most importantly, how do I install something like this so it will stay in place when going around a corner?

    Thanks in advance!
     
  2. Jul 12, 2022
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
    Joined:
    Aug 10, 2003
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    23,596
    Are you using the original tank and sending unit? If so, there is a fuel sock on the end of the pickup that should feed fuel until the tank is completely empty. Jeep PN 914933. If you can't find that part, you may need to either shorten the dip tube slightly and use the longer sock 3230376 or fit the sender for the later tank with the longer sock.

    There are some pickup pucks that can be connected to the pickup to reach the fuel better. You can search and find those. Maybe try "universal fuel pickup."

    If that does not work, I expect you'll need to convert to an in-tank fuel pump or add a surge tank aka accumulator under the hood. You can buy the surge tank complete, or make one from a spin-on fuel filter and remote oil filter adapter.

    surge tank: http://www.ifsja.org/forums/vb/showpost.php?p=1272277&postcount=22
     
    Last edited: Jul 12, 2022
  3. Jul 12, 2022
    JustJeff

    JustJeff New Member

    Colorado
    Joined:
    Apr 20, 2021
    Messages:
    25
    Hmmm, I think I've already done what you are suggesting, but not sure.
    It has an in take fuel pump (Bosh 69544). I then bought a fuel strainer to go over that, looks similar to the sock that you mentioned, but fits right on the bottom of the fuel pump. So, if the jeep is sitting level it will use all the fuel in the tank. However, the gas in the tank sloshes around a lot (I don't know for sure, but I'm assuming that the tank is NOT the original tank - nothing on this jeep is). So I'm looking for a bowl or something to go at the bottom that will act like baffles. Or, is there another reason that an in tank fuel pump would stop working for a few seconds around turns when I'm less than 1/4 full?
     
  4. Jul 12, 2022
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
    Joined:
    Aug 10, 2003
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    I am familiar with the flat sock that goes on the bottom of the Bosch in-tank pump. I don't know of the cup that you are describing, though it makes sense that it would slow the flow of fuel away from the pickup when cornering. However, if you were using the original tank, the hole for the sender or pump is close to the center of the tank; I'd think the pump would be starved on left or right turns.

    Maybe it's an electrical problem? A test light from the pump that you can watch while driving would answer that. You could also put a fuel pressure gauge in the line to the engine, and confirm that you are losing fuel pressure when you make the turn.

    The German cars use an accumulator that goes in the high side of the fuel flow, but they are expensive. The accumulator shown in the above link is meant for low pressure, and the high pressure pump goes after the accumulator, close to the engine. '80s Fords use a low pressure pump that goes into the fuel tank and an external high pressure pump; maybe that would work for you in combination with another high pressure pump, like in the link above.

    You could remove the in-tank pump, substitute the factory pickup and tank, and use the accumulator config like shown in the above link. I'm sure that would work for you, but it's a lot to do. I'm imagining you have the Chevrolet-style in-tank pump mounted on the original sender. This pump only makes about 15 psi IIRC, but it works with the GM Rochester throttle body.

    There are aftermarket add-on in-tank fuel pumps like this -

    addedFuelPump.png

    You can see that there is a pan of sorts that baffles some fuel near the pickup. I recall some articles where the Bosch pump hangs from the existing sender with the pickup near the bottom of the tank. You kinda can't have the pan because the hole in the tank is barely large enough to accept the pump. Seems likely this is what you have.

    Here's a link to the above pump setup - https://www.summitracing.com/parts/tnk-pa-4?rrec=true - with this, you'd need to put the factory sender back into the original hole (so you have a sender) and cut a new hole for the fuel pump.
     
    Last edited: Jul 12, 2022
  5. Jul 12, 2022
    sterlclan

    sterlclan Member 2022 Sponsor

    exploring the...
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    Feb 21, 2009
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    drill some holes in a plastic cup that will fit down the hole in top of the tank and over the pump? if the pump is sitting on the tank bottom it should hold the "baffle" in. the hole in the top of a cj tank is kinda small. yj jeeps with a fuel injected engine would have baffles in the tank.
     
  6. Jul 12, 2022
    Lockman

    Lockman OK.....Now I Get It . 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Silver Hill,...
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    ......Or , an much easier fix, especially with FI, don't' go below a 1/4 tank . :bananatool:
     
    Bondo, Buildflycrash and colojeepguy like this.
  7. Jul 15, 2022
    JustJeff

    JustJeff New Member

    Colorado
    Joined:
    Apr 20, 2021
    Messages:
    25
    I think I'll try the cup for a while - see if that helps. Of course I'm also looking into other options like keeping it more than 1/4 full.

    If that doesn't work, I'll look at one of those accumulator type things.

    Thanks for the help!
     
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