scoobyis2cool
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| posted on 7/5/05 at 04:26 PM |
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Fuel draining back into tank
When I leave my car sitting for a while I find that the fuel drains back through to the tank. This means that when I want to start it up the next time
I have to turn it over on the starter for a while to get fuel to the carb (It's a mechanical fuel pump so I can't run the pump on its
own). Is there any way I can prevent the fuel draining back or is this just something I'll have to put up with?
Cheers,
Pete
It's not that I'm lazy, it's that I just don't care...
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Peteff
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| posted on 7/5/05 at 04:33 PM |
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There should be enough in the float to start it up and pump the next lot through. Is that definitely the problem? Put a 'U' bend in the
pipe like in your sink plumbing or lower the pipe below the tank exit so it gravity feeds and the pump stays primed.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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MkIndy7
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| posted on 7/5/05 at 05:07 PM |
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You could try one of those cheap inline fuel filters inbetween the fuel pump and the carb as a bit of a resevoir
Thats we have with one before the pump as well, neither of which i've never known to empty
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rusty nuts
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| posted on 7/5/05 at 05:14 PM |
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Fitting an electric pump would solve your problem, just switch on the ignition and wait a few seconds but fuel shouldn't be able to drain back
from carb as the fuel inlet is above the fuel level so the fuel can't syphon. Could be excess heat in the engine bay is causing the fuel to
vaporise . Fiat X19s used to suffer with fuel vaporising causing poor starting, fitting an electric pump used to sort them out, also unleaded fuel
tends to vaporise easily.
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britishtrident
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| posted on 7/5/05 at 07:51 PM |
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Shouldn't happen something is wrong --- check the carb isn't cracked and the insulating spacer gasket is in place
Also check the fuel pump you may find either the valves or the diaphram could be leaking.
Also check the tank is vented properly
[Edited on 7/5/05 by britishtrident]
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bob
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| posted on 7/5/05 at 08:03 PM |
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my money is on their being no vent in the tank.
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paulf
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| posted on 7/5/05 at 09:37 PM |
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I have the same problem with mine if i leave it a few days., I suspect that the fuel evaporates due to engine heat.Its ok if i use it each day or put
it in the garage cold, i think that some fuel evaporates and leaves enough to start it, but if left for a few days this remaining fuel also
evaporates.
I got a fuel pressure regulator off the front wing of a Sierra and hope this may solve the problem but have not fitted it yet as i need to modify the
fixing bracket to make it look neat.
Paul.
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scoobyis2cool
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| posted on 8/5/05 at 12:10 AM |
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I am currently running a pressure regulator, thinking back I remember one of the MK guys telling me that these can sometimes cause problems, so maybe
I'll give it a go with it disconnected.
It can sometimes be weeks between drives because I'm back and forth between uni, so the car is sitting for a long time, perhaps it just needs
slightly more regular starting.
Cheers,
Pete
It's not that I'm lazy, it's that I just don't care...
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pmc_3
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| posted on 8/5/05 at 09:26 AM |
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What sort of choke is on it? Mine is a water controlled one. I find that pumping the throttle pedal twice before turning it over helps. I think the
choke sticks slighty because if I dont do this it starts up with no choke.
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scoobyis2cool
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| posted on 8/5/05 at 09:49 AM |
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I'm not sure what choke it is but the problem doesn't seem to get any better even once the engine is up to temperature. Even after
I've been using the throttle fully it does the same thing so I don't think that's the solution unfortunately 
Pete
It's not that I'm lazy, it's that I just don't care...
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bob
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| posted on 8/5/05 at 10:12 AM |
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I've never had this problem with the pinto and downdraught carb,maybe your idle mixture screw is too far in.When running unscrew it half a turn
at a time and see if it idles better,also as said ealier before starting i always prime with fuel with the accelerator pedal.
I've left mine for more than 3 weeks and its allways started with no problems.
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scoobyis2cool
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| posted on 8/5/05 at 11:42 AM |
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By idle screw do you mean the idle speed screw or the mixture screw? I remember setting these by turning to mixture screw until the idle revs rose to
a peak, then adjusted the idle screw down to about 1000rpm, then repeated - not very precise I know but it was the best I could do by hand! Maybe this
needs some further adjustment?
Pete
It's not that I'm lazy, it's that I just don't care...
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bob
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| posted on 8/5/05 at 03:46 PM |
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Pete
I mean the mixture screw,the one at the base of the carb on the corner pointing at the driver.
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Peteff
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| posted on 8/5/05 at 06:40 PM |
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pumping the throttle pedal twice
On my Mk4 Escort it was necessary to press the pedal once to the floor to set the choke before starting. That was a thermostatic choke Weber carb
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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