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Geoff Mackenzie
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 Posted: Fri Jul 04, 2008 3:02 pm Post subject: New car, new problem |
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Sorry, deleted original thread about the Minor cutting out or not starting
when warm.
My money is on the petrol filler cap. Had exactly the same problem years
ago. Blamed the fuel pump initially, as it was seriously hot and famously
unreliable (SU - similar to yours?). Had to abandon the car one night, went
back next morning (surprised to find it still there, including wheels).
Having thought about it overnight, recalled that I had managed to lose the
filler cap when refuelling - God knows how - so bought a cheap rubber cap to
do for the moment.
Anyway - next morning, having wondered about venting, went back to car and
removed the rubber cap. Not so much an intake of air - more a mighty bang
as the petrol tank resumed its original shape. Large hole bored in rubber
cap with a penknife, ran perfectly thereafter.
Of course the reason the fuel pump was hot was that it was trying to do the
impossible. A herring of the red variety.
So - next time it happens, just take the filler cap off and see if that
solves the problem.
Good luck,
GMack |
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Jim Warren
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| Posted: Fri Jul 04, 2008 11:56 pm Post subject: Re: New car, new problem |
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Geoff Mackenzie wrote:
| Quote: |
Sorry, deleted original thread about the Minor cutting out or not starting
when warm.
My money is on the petrol filler cap. Had exactly the same problem years
ago. Blamed the fuel pump initially, as it was seriously hot and famously
unreliable (SU - similar to yours?). Had to abandon the car one night, went
back next morning (surprised to find it still there, including wheels).
Having thought about it overnight, recalled that I had managed to lose the
filler cap when refuelling - God knows how - so bought a cheap rubber cap to
do for the moment.
Anyway - next morning, having wondered about venting, went back to car and
removed the rubber cap. Not so much an intake of air - more a mighty bang
as the petrol tank resumed its original shape. Large hole bored in rubber
cap with a penknife, ran perfectly thereafter.
Of course the reason the fuel pump was hot was that it was trying to do the
impossible. A herring of the red variety.
So - next time it happens, just take the filler cap off and see if that
solves the problem.
Good luck,
GMack
The car currently sports an almost new lockable cap, apparently after |
half a tank of petrol got siphoned out, according to the person I bought
the car from. I can certainly try taking the cap off next time I have a
problem, but surely a cap that isn't cheap ought to be vented, though I
can't actually see where the air would get in, unless it creeps down the
keyhole.
Jim |
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David Billington
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| Posted: Sat Jul 05, 2008 2:21 am Post subject: Re: New car, new problem |
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Jim Warren wrote:
| Quote: |
Geoff Mackenzie wrote:
Sorry, deleted original thread about the Minor cutting out or not
starting when warm.
My money is on the petrol filler cap. Had exactly the same problem
years ago. Blamed the fuel pump initially, as it was seriously hot
and famously unreliable (SU - similar to yours?). Had to abandon the
car one night, went back next morning (surprised to find it still
there, including wheels). Having thought about it overnight, recalled
that I had managed to lose the filler cap when refuelling - God knows
how - so bought a cheap rubber cap to do for the moment.
Anyway - next morning, having wondered about venting, went back to
car and removed the rubber cap. Not so much an intake of air - more
a mighty bang as the petrol tank resumed its original shape. Large
hole bored in rubber cap with a penknife, ran perfectly thereafter.
Of course the reason the fuel pump was hot was that it was trying to
do the impossible. A herring of the red variety.
So - next time it happens, just take the filler cap off and see if
that solves the problem.
Good luck,
GMack
The car currently sports an almost new lockable cap, apparently after
half a tank of petrol got siphoned out, according to the person I
bought the car from. I can certainly try taking the cap off next time
I have a problem, but surely a cap that isn't cheap ought to be
vented, though I can't actually see where the air would get in, unless
it creeps down the keyhole.
Jim
Probably something like vented down the keyhole. Remember that you |
aren't using fuel at a great rate and temperature changes occur slowly
so the hole size required for venting is small. Now if you were Nick
Mann running his old MM with the twin turbo V8 with injection and
nitrous you might want a larger fuel cap vent. On a similar note a guy I
know had to his tank crushed on a diesel Ford when the tank vent
blocked, a common fault IIRC, and the pump kept pumping till it couldn't
draw anymore, the atmospheric pressure acting on the evacuated tank
crushed it. |
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Mike.H.
Guest
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| Posted: Sat Jul 05, 2008 2:23 pm Post subject: Re: New car, new problem |
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Has anyone suggested checking valve clearances.It is not unknown for gaps to
close up when hot and keep valves slightly open when hot causing starting
problem or even non starting.Maybe the seller closed up the gaps to "cure"
noisy valve gear .Worth checking.
MH
"David Billington" <djb@djbillington.freeserve.co.uk> wrote in message
news:486e9471$0$2930$fa0fcedb@news.zen.co.uk...
| Quote: |
Jim Warren wrote:
Geoff Mackenzie wrote:
Sorry, deleted original thread about the Minor cutting out or not
starting when warm.
My money is on the petrol filler cap. Had exactly the same problem
years ago. Blamed the fuel pump initially, as it was seriously hot and
famously unreliable (SU - similar to yours?). Had to abandon the car
one night, went back next morning (surprised to find it still there,
including wheels). Having thought about it overnight, recalled that I
had managed to lose the filler cap when refuelling - God knows how - so
bought a cheap rubber cap to do for the moment.
Anyway - next morning, having wondered about venting, went back to car
and removed the rubber cap. Not so much an intake of air - more a
mighty bang as the petrol tank resumed its original shape. Large hole
bored in rubber cap with a penknife, ran perfectly thereafter.
Of course the reason the fuel pump was hot was that it was trying to do
the impossible. A herring of the red variety.
So - next time it happens, just take the filler cap off and see if that
solves the problem.
Good luck,
GMack
The car currently sports an almost new lockable cap, apparently after
half a tank of petrol got siphoned out, according to the person I bought
the car from. I can certainly try taking the cap off next time I have a
problem, but surely a cap that isn't cheap ought to be vented, though I
can't actually see where the air would get in, unless it creeps down the
keyhole.
Jim
Probably something like vented down the keyhole. Remember that you aren't
using fuel at a great rate and temperature changes occur slowly so the
hole size required for venting is small. Now if you were Nick Mann running
his old MM with the twin turbo V8 with injection and nitrous you might
want a larger fuel cap vent. On a similar note a guy I know had to his
tank crushed on a diesel Ford when the tank vent blocked, a common fault
IIRC, and the pump kept pumping till it couldn't draw anymore, the
atmospheric pressure acting on the evacuated tank crushed it. |
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Jim Warren
Guest
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| Posted: Sat Jul 05, 2008 3:59 pm Post subject: Re: New car, new problem |
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Mike.H. wrote:
| Quote: |
Has anyone suggested checking valve clearances.It is not unknown for gaps to
close up when hot and keep valves slightly open when hot causing starting
problem or even non starting.Maybe the seller closed up the gaps to "cure"
noisy valve gear .Worth checking.
MH
|
You are right, it is worth checking, but after the more likely
candidates have been eliminated. But according to the paperwork, it had
a 6000 mile service and MOT only 100 miles or so ago. It is not likely
that gaps set during the service would need fiddling with after so
little mileage.
And I have had gaps close on another car (Rover P4) in the past, and
there was a noticeable misfire on tickover when hot, that could be felt
at the tailpipe. I haven't noticed that on the Minor.
Jim |
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