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Thread: Seems like my Series 2a is getting intermittently fuel starved

  1. #1

    Default Seems like my Series 2a is getting intermittently fuel starved

    Disclaimer: I can turn a few wrenches, but I'm NOT a mechanic by any means. I've had my '69 Series IIa 109 for about 5 years. Always ran well with some light maintenance and topping of fluids.

    No idea what engine I have other than it appears to be a four cylinder petrol. Engine number from the block stamp is 30600490K

    Recently, while driving she's not getting fuel. At random time she'll get fuel starved. I'll stomp the gas pedal to the floor with out much response kinda like idling and then, suddenly, she'll get fuel and get going again.

    So far I've replaced the fuel filter and the entire fuel pump, but no real change.

    When idling she sounds and revs up just fine. No issues starting right up.

    Any thoughts as to what to do next? It's fine to tell me, "you're out of your league man. Take her to a mechanic."

    I'm always willing to try within my limits and I'm hard to offend.

    Fire at will (My name is not Will thought...)

    Thanks!

  2. #2
    Join Date
    Oct 2006
    Location
    North MS
    Posts
    981

    Default

    Did it just start doing it when the weather warmed up? A lot of these trucks seem to have vapor lock issues when using/running a metal fuel line up to the carb. How dirty was the fuel filter? When I replace one, I tap the inlet end against a block of wood to see what comes out. Before I replaced the old gas tank in my 109, it was so rusty I was replacing a fuel filter every hundred miles! But if you already changed it, that's likely not it.

    Will it rev up nicely after stalling, if you take it out of gear? If yes, then it's not getting enough fuel from the line under load. That could be a bad/weak pump, old fuel lines that are collapsing under load, or a blockage in a line, at the carb, or the tank itself.
    61 II 109" Pickup (Restomod, 350 small block, TR4050)
    66 IIA 88" Station Wagon (sold)
    66 IIA 109" Pickup (Restomod, 5MGE, R380)
    67 IIA 109" NADA Wagon (sold)
    88, 2.5TD 110 RHD non-hicap pickup

    -I used to know everything there was to know about Land Rovers; then I joined the RN Bulletin Board.

  3. #3

    Default

    Thank you for the reply. The fuel filter was not the worst I've ever seen, but as you said the problem persisted even after changing the filter and the pump. It does seem to rev up fine when out of gear. I think my next action will be to try to check for blockage from the tank.

    Again, not a mechanic, but Series Land Rover youtubers haven't steered me wrong so far.

    I'll let everyone know what I find.

    Thanks again

    ck

  4. #4

    Default

    If it is a vapor lock issue it will only occur when the engine bay is warm. If it occurs under load while not fully up to temperature, it's not a vapor lock issue. It could also not be fuel related and possibly distributor, coil, sparking plugs leads, etc. Which carb do you have?

  5. #5
    Join Date
    Dec 2010
    Posts
    413

    Default

    Sometimes i've suspected vapor lock, particularly with rubber fuel hose but in this case i'd suspect first a moving fuel blockage in the tank, I guess it could be intermittant electrical but with that you have to catch it in the act, usually on the trail someplace.

  6. #6
    Join Date
    Jul 2020
    Location
    UK
    Posts
    312

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    Quote Originally Posted by jimrr View Post
    Sometimes i've suspected vapor lock, particularly with rubber fuel hose but in this case i'd suspect first a moving fuel blockage in the tank, I guess it could be intermittant electrical but with that you have to catch it in the act, usually on the trail someplace.
    I once had a Diesel 88" with similar problems and it turned out there was a plastic cap, the ones used to cap pipes to prevent dirt ingress during transit, inside the tank which occasionally was sucked onto the bottom of the pick up pipe , restricting the flow. The problem was exacerbated by it falling off when you stopped the engine so curing itself for a while thus difficult to replicate.

  7. #7

    Default Pump

    There are a lot of aftermaarket fuel pumps out there...that don't function as intended. They are known to be absolutely awful. A genuine rover pump always works well and lasts for years. Pressure wants to be ~ 1.75-2.5 psi for petrol or 5-6 # for the diesle pump. I recommend your checking your fuel pressure, preferably at the carb.

  8. #8
    Join Date
    Apr 2021
    Location
    SF Bay Area
    Posts
    239

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    @Millivanilli
    All of what these fine folks said is true. Iíll add one more thing to tryÖ

    Had a similar thread here:
    https://forums.roversnorth.com/showt...831#post113831

    I think my issue turned out to be vacuum buildup in the fuel lines due to not venting the tank. I put a rubber gasket on my venting gas cap, thereby blocking the venting. It was so insignificant, I forgot about it. Ran without a gas cap for a week and the truck ran great! Thatís how I found out. Removing that gasket fixed my issue. Dumb, but it worked.

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