This is probably the same drama as a previous correspondent had, but on short journeys, my traveller runs beautifully until I turn off the engine.
When I get back in, she drives for about 100 metres, and then dies. After this the engine turns over, fires and runs for about 5 seconds but dies.
If I leave for an hour and let the engine cool, it is fine. I don't think it's electrical as she never stalls or stops under normal operating conditions, it's only if I park for a few minutes.
Stephen
sodowd@telstra.com
Traveller starts but cuts out when hot
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Willie
- Minor Legend
- Posts: 3204
- Joined: Tue Feb 12, 2002 12:00 am
- Location: S E London
- MMOC Member: No
Lo, obviously there are several possible
causes but 'Heat soak' could be one of them.
i.e. the fuel could be evaporating because
on the Minor the fuel lines are over the
exhaust system so that when you stop the
engine the heat rises,undisturbed by the fan,
because the engine has stopped,. and can cause the petrol to evaporate in the pipes
meaning that you only have the fuel left in the float chamber which is probably enough
for a few hundred yards. The problem is worse if you are using unleaded fuel which
definitely 'burns hotter'and gives more
trouble from evaporation. The MG midget, which is basically the same engine has a large asbestos sheet (heat shield) between the carbs and the exhaust to prevent this
very fault. 'Mr Grumpy' advertises a kit to
make the float chamber and the petrol pump
run cooler, I do not know if it is effective.
perhaps someone who has tried it can comment?
Willie
causes but 'Heat soak' could be one of them.
i.e. the fuel could be evaporating because
on the Minor the fuel lines are over the
exhaust system so that when you stop the
engine the heat rises,undisturbed by the fan,
because the engine has stopped,. and can cause the petrol to evaporate in the pipes
meaning that you only have the fuel left in the float chamber which is probably enough
for a few hundred yards. The problem is worse if you are using unleaded fuel which
definitely 'burns hotter'and gives more
trouble from evaporation. The MG midget, which is basically the same engine has a large asbestos sheet (heat shield) between the carbs and the exhaust to prevent this
very fault. 'Mr Grumpy' advertises a kit to
make the float chamber and the petrol pump
run cooler, I do not know if it is effective.
perhaps someone who has tried it can comment?
Willie
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Willie
- Minor Legend
- Posts: 3204
- Joined: Tue Feb 12, 2002 12:00 am
- Location: S E London
- MMOC Member: No
ok,so it still appears to be a heat problem,
i.e. the stationary hot engine sits there
and cooks everything under the bonnet. If
the rising manifold heat is causing evapor-
ation of the fuel you should hear the fuel
pump 'ticking ' erratically as it attempts to
pump 'gas' instead of petrol? does that
happen??
Willie
i.e. the stationary hot engine sits there
and cooks everything under the bonnet. If
the rising manifold heat is causing evapor-
ation of the fuel you should hear the fuel
pump 'ticking ' erratically as it attempts to
pump 'gas' instead of petrol? does that
happen??
Willie
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stephen
- Minor Friendly
- Posts: 15
- Joined: Tue Feb 12, 2002 12:00 am
- Location: Brisbane, Queensland
- MMOC Member: No
Not that I can hear.
It's definitely fuel though. When the engine has cooled down and I switch the ignition on, the fuel pump ticks over, so it is filling a void somewhere between the pump and the Engine.
Yesterday I removed the filter that sits in the carb feed hose and flushed with petrol. I also tightened all the connections in case there was some leakage.
It's definitely fuel though. When the engine has cooled down and I switch the ignition on, the fuel pump ticks over, so it is filling a void somewhere between the pump and the Engine.
Yesterday I removed the filter that sits in the carb feed hose and flushed with petrol. I also tightened all the connections in case there was some leakage.
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Willie
- Minor Legend
- Posts: 3204
- Joined: Tue Feb 12, 2002 12:00 am
- Location: S E London
- MMOC Member: No
ok so it pumps when it cools down but does
it pump wwhen you switch on and the hot
engine will not start?? If not I suggest,
when it is in its' 'won't start' condition
that you carefully remove the rubber petrol pipe where it joins the carb float chamber,
(careful it will drip some petrol,or should do)insert the end into a suitable container
and get someone to turn on the ignition. The
pump should operate steadily. If you get a
good supply of fuel you have eliminated the pump and petrol supply lines. Replace the
petrol pipe and see if it pumps now. If not
undo the top of the float chamber(three
screws)and check that there is fuel in there
An alternative method could be to buy a tin
of 'freezing spray'(obtainable from a plumbers merchants) if you spray the float
chamber and the fuel pipe and it then starts
you know it is a vapourisation problem
Willie
it pump wwhen you switch on and the hot
engine will not start?? If not I suggest,
when it is in its' 'won't start' condition
that you carefully remove the rubber petrol pipe where it joins the carb float chamber,
(careful it will drip some petrol,or should do)insert the end into a suitable container
and get someone to turn on the ignition. The
pump should operate steadily. If you get a
good supply of fuel you have eliminated the pump and petrol supply lines. Replace the
petrol pipe and see if it pumps now. If not
undo the top of the float chamber(three
screws)and check that there is fuel in there
An alternative method could be to buy a tin
of 'freezing spray'(obtainable from a plumbers merchants) if you spray the float
chamber and the fuel pipe and it then starts
you know it is a vapourisation problem
Willie