Starting

Discussion in 'Mech Tech' started by wingnut1574, Dec 23, 2018.

  1. if the membrain in the fuel pump is holed and if parked ,tank can graviy feed its self straight through the feul pump and straight into engine ,watering down engine oil and making it hard to start ,
     
  2. Bhubesi

    Bhubesi Supporter

    If I leave 'Dan's Bus' for a few weeks, I pump the throttle about four times and then perform a normal cold start.
    Be aware that you should give the starter motor a chance to cool after several attempted starts.
    Tony
     
    snotty likes this.
  3. Ozziedog

    Ozziedog Supporter

    I’d check a couple of things all related to the above ^^^. ;)
    Float condition and float level would be first then needle and seat. For a couple of quid from Euro Carb you can get a new float and needle and seat. But don’t just put it in, really take the time to get the level as perfect as poss. If your old float drops just a silly willionth because of a smidge of evaporation and if your float level is already a tad low, then you’ve got an air inlet to that fuel which might speed up evaporation to the degree that you’re experiencing.

    Ozziedog,,,,,,, just a thought, might be wrong (again) :)

    P.S. MerryChrimbleton :):cool::)
     
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  4. Bhubesi

    Bhubesi Supporter

    I think that my fuel pump does not maintain the head of fuel between the pump and carb.
    Tony
     
  5. A valve is available to maintain fuel in the pipe. Should this be placed before or after the fuel pump?
    Happy Christmas by the way :burp:

    [​IMG]
     
  6. mikedjames

    mikedjames Supporter

    The stock pump develops a lot of suction, so you could put that valve anywhere. Interestingly because those check valves need a pressure difference to open they also protect in the case of fire/broken fuel pipes downstream. If the fuel pump stops the head of fuel from the tank will not be enough to hold the valve open.

    Also in a stock carb check the jet access screw at the bottom of the float bowl on the left hand side is not leaking. Any sign of petrol or staining around the carb, leaks are likely.
     
    Last edited: Dec 25, 2018
  7. Ozziedog

    Ozziedog Supporter

    I maintain that the head of fuel will stay there if there is no chance of air getting in the fuel lines, either at the carb or the fuel pump. Check your fuel pump with the water bottle thingy. Pop the fuel pipe off the carb into a water bottle about one and a half litres ish and led on its side. Take the rotor out then Crank the motor for five or ten seconds and you should see the vinegar stroke hitting the bottom of the bottle ish. If the pumps creamed and crackered it’ll just dribble into bottle. Your carb should be full before five seconds of cranking.

    Ozziedog,,,,,,,, don’t let it spray everywhere :)
     
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