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Thread: Does this sound like fuel pump problem?

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    Does this sound like fuel pump problem?

    I have not been able to drive my TR3 for about a month. Today I tried to start it and it would not start. I pumped the fuel pump lever a bunch of times but I could not feel any pressure. I have about 1/2 tank of gas. I then took the filters off and squirted gas into both carbs. It would start immediately and run for several seconds and then stop. I did that about 4 times, fully chocking it each time. Each time I put gas in the carbs it would start but then die. I put on a new fuel pump some time in 2012. I have been using both non-ethanol and ethanol gas. I am thinking the fuel pump has failed. Agreement, or could the problem be something else? Thank you!
    Bob

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    Re: Does this sound like fuel pump problem?

    I just had the same problem. Found out the 6 screws holding diaphram down are loose Get lucky fast, I hope. LeT

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    Yoda TOC's Avatar
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    Re: Does this sound like fuel pump problem?

    Could be. Maybe. Possibly.

    Might just be the coil (joke).

    However, rotten rubber hose in the line from tank to pump.
    Rotten metal pipe in same area.
    Pickup tube plugged or rotted.

    But, yeah, after all that it could be the pump (or the coil).

    You need to have almost perfect suction. Even small holes in lines, loose clamps on old hardened rubber hoses, and loose diaphragm screws. Link to diaphragm broken.

    Disconnect both sides of the pump. Drop a hose from suction side to gas can. Pump manual prime lever, see what comes out the pressure side.

    Then work back towards the tank.

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    Great Pumpkin TR3driver's Avatar
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    Re: Does this sound like fuel pump problem?

    You also get no pressure at the manual lever if the feed to the float bowls is blocked. That's the first thing I would check, as I've seen it several times. Some gas seems to form a hard deposit when it dries (instead of the old varnish), which can glue the float valves shut.
    Randall
    56 TR3 TS13571L once and future daily driver
    71 Stag LE1473L waiting engine rebuild
    71-72-73 Stag LE2013LBW waiting OD gearbox rebuild

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    Re: Does this sound like fuel pump problem?

    Quote Originally Posted by TR3driver View Post
    You also get no pressure at the manual lever if the feed to the float bowls is blocked. That's the first thing I would check, as I've seen it several times. Some gas seems to form a hard deposit when it dries (instead of the old varnish), which can glue the float valves shut.
    Except:
    " I then took the filters off and squirted gas into both carbs. It would start immediately and run for several seconds and then stop. I did that about 4 times,"
    We do know the inlets to the carbs aren't blocked.
    We also know there is fuel in the tank:
    "I have about 1/2 tank of gas."

    So, both carbs are blocked, both floats stuck "up", both needles bad......hard to figure.

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    Re: Does this sound like fuel pump problem?

    I took the fuel line off right in front of the carbs and pumped the fuel pump lever and no gas came out of the gas line. BTW, the sediment bowl on the fuel pump is clean, no sediment. I did see a bit of sediment in the gas when I took the metal fuel filter off and poured the gas out of the "in" outlet of the fuel filter. The gas coming out of the "out" outlet of the filter did not have any sediment. I put a new fuel filter on anyway but it did not help.
    Bob

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    Great Pumpkin TR3driver's Avatar
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    Re: Does this sound like fuel pump problem?

    Quote Originally Posted by TOC View Post
    Except:
    " I then took the filters off and squirted gas into both carbs. It would start immediately and run for several seconds and then stop. I did that about 4 times,"
    We do know the inlets to the carbs aren't blocked.
    I interpreted that to mean he squirted gas into the air intake (throats) rather than into the float bowls. If so, the test, while very informative, doesn't prove there is fuel in the bowls or that it is getting through the jets into the throats.

    We also know there is fuel in the tank:
    "I have about 1/2 tank of gas."
    Not really relevant, just a humorous story: the other day, a friend decided the fuel pump in his pickup must be bad. Cut a hole in the bed rather than deal with dropping the tank (fuel pump lives in the tank on that model, like most modern cars & trucks). Replaced the fuel pump; still wouldn't run. Took the new pump back out, and finally noticed that it was bone dry!

    Problem all along was a stuck fuel sender. Rather than the 3/4 shown on the gauge, the tank was dry. Added some fuel, started right up.
    Randall
    56 TR3 TS13571L once and future daily driver
    71 Stag LE1473L waiting engine rebuild
    71-72-73 Stag LE2013LBW waiting OD gearbox rebuild

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    Re: Does this sound like fuel pump problem?

    Have you checked to see if fuel is reaching the fuel pump from the tank?
    You could also make up a small, temporary fuel supply attached to the pump and check that the pump is OK.

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    Re: Does this sound like fuel pump problem?

    Disconnect the fuel line to the tank right before the pump. If fuel runs out, then chances are the pump is bad. If no fuel runs out, you have a blocked line to the tank.
    John

    1955 TR2

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    Re: Does this sound like fuel pump problem?

    It could also be that old problem of something in the tank blocking the outlet.

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    Re: Does this sound like fuel pump problem?

    Have you got the fuel tap turned on?

    Graham
    [SIGPIC][/SIGPIC]

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    Re: Does this sound like fuel pump problem?

    I have a fuel shutoff valve right before the fuel filter then a short hose runs from the filter to the pipe going to the fuel pump. When I disconnected the fuel filter at the "IN" end and turned on the shutoff valve, the gas flowed freely out of the pipe coming from the fuel tank. Thanks for all the suggestions!
    Bob

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    Re: Does this sound like fuel pump problem?

    I think you’ve got it! Fuel pump.
    John

    1955 TR2

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    Re: Does this sound like fuel pump problem?

    Thanks John. I agree...fuel pump. When I was looking for a replacement fuel filter in my stuff I ran across the "emergency" electric fuel pump that I bought off the internet at least a year ago. I think it was Geo Hahn who posted the recomendation back then. I had forgotten I had that. So today I hooked it up and sure enough, the car started right up and ran good. I only bypassed the fuel pump, nothing else. I would not want to drive very much with it since I've attached it to electric with aligator clips. At least I can run the engine until I can get a new mechanical fuel pump and get it installed. I appreciate the help and ideas from everyone!!!
    Bob

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    Re: Does this sound like fuel pump problem?

    Buy a pump that has a manual pump lever...makes easier priming when car has sat for some time.

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    Re: Does this sound like fuel pump problem?

    Quote Originally Posted by malbaby View Post
    Buy a pump that has a manual pump lever...makes easier priming when car has sat for some time.
    Saves wear and tear on the starter and crank bearings too!
    John

    1955 TR2

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