Fuel supply diagnosis
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  1. #1
    Official RnS Addict ChopperHarris's Avatar
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    Fuel supply diagnosis

    1962 Simca
    60345242_10216306469147950_2798536806730039296_n.jpg
    Consider it as a Ford of the same age.
    Wouldnt start after a 3 month body refurb.
    Traced to a dead condensor.
    Now runs on tickover fine but dies after 300m normal driving.
    Carb dismantled, cleaned and changed as a last resort
    Bubbles in inline petrol filter, bypassed, same result
    Removed mechanical pump tonight and can blow through....pump "arm" by hand with finger over outlet and pressure is still there after 30 seconds so assume diaphragm ok?
    Tank half full and just put in another 20 litres, all is fresh.
    When pipe is removed from carb and engine cranked, first two pumps are strong then a dribble (ooh err)

    So its a supply problem, all unions tight, tank vent clear, tank emptied twice(drained), and no more rust.
    Any opinions ideas please

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    Stroker Kustom Jim's Avatar
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    Lovely car!

    Dunno about issue but hazard pump may be untoward. If it's ancient it's just an investment servicing anyhoo.
    What about, pull the plugs and spin the bleeder over with pump installed and a visible fuel line in to bucket to see if it keeps on squirting!?

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    Official RnS Addict ivanhoew's Avatar
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    breather blocked in tank cap ?
    Bicester scramble ,Medusa enjoyed the trip.https://www.youtube.com/watch?v=Q-7I7-nA19U

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  6. #4
    Official RnS Addict ChopperHarris's Avatar
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    Quote Originally Posted by ivanhoew View Post
    breather blocked in tank cap ?
    Thanks, tried it without cap

  7. #5
    Official RnS Addict ChopperHarris's Avatar
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    Quote Originally Posted by Kustom Jim View Post
    Lovely car!

    Dunno about issue but hazard pump may be untoward. If it's ancient it's just an investment servicing anyhoo.
    What about, pull the plugs and spin the bleeder over with pump installed and a visible fuel line in to bucket to see if it keeps on squirting!?
    Thanks, the filter is visible and the squirting drops after the first two pulses
    I agree about the service item but unlike a Ford parts are scarce, especially here in boondock France...

  8. #6
    Official RnS Addict mygasser's Avatar
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    facet or similar leccy pump?
    did you blow back down the fuel pipe from the pump to the tank in case there's muck in there somewhere?
    neil.
    need a job done on your project? i may be able to help.

  9. #7
    Off the Xmas card list kapri's Avatar
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    Any rubber lines at all ? If they are not marked as suitable for unleaded bin them . I've had them breakdown inside and create blockages that ebbed and flowed ith pressure and mileage.

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    Is there a strainer on the pick up pipe? I’ve had these block up and after shopping the crap drops off. Also had similar from plastic and material in the tank. Not had the rubber issue on fuel lines yet, had it with brake lines a few times though!

  11. #9
    Official RnS Addict ChopperHarris's Avatar
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    Its mechanical pump.
    Yes blown back down..not sure about strainer, the pick up pipe enters the top of the tank.
    The rubber pipes at engine end, carb to filter, filter to pump and pump to solid, are new and clean.

    Could be bubbles entering the filter be a failed diaphragm in pump (but it holds pressure as in OP)?

  12. #10
    Official RnS Addict ivanhoew's Avatar
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    is it feasble to stick the pipe to the tank in a petrol can , just to completely rule out tank related probs?
    Bicester scramble ,Medusa enjoyed the trip.https://www.youtube.com/watch?v=Q-7I7-nA19U

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