Hi Iain,
If the rev counter is stable when you have intermittent running are you sure you haven't still got any fuel related issues?
Are the carb pistons nice & clean & haven't got waxed up with old fuel , with the car having stood since the summer. Has the in line fuel filter got gummed up ? Is the small hose connecting the two carbs in good condition & not collapsing / bit of rubber breaking off internally? (I have had all these over the years).
Is the fuel pump providing fuel at about a pint every half minute?
Cheers,
Charles
Poor Running (intermittent)
- Charles Farran
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- Forename: Charles
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Re: Poor Running (intermittent)
1980 Roadster
Re: Poor Running (intermittent)
Thanks Charles, this is where I'll be starting.
"small tube connecting the carbs" - what do you mean, I don' think I have one (HS4)
"small tube connecting the carbs" - what do you mean, I don' think I have one (HS4)
Re: Poor Running (intermittent)
Good point Charles. I'm afraid I was misled by the description of the tachometer as being "static". I misunderstood and assumed it meant reading zero.
Ian F
Ian F
MGCC member
1972 BGT, Blaze, Navy trim, recessed grill
1961 Midget, 948cc, Clipper Blue, Blue trim and weather gear
1972 BGT, Blaze, Navy trim, recessed grill
1961 Midget, 948cc, Clipper Blue, Blue trim and weather gear
Re: Poor Running (intermittent)
P.s.
My '72 BGT doesn't have such a tube as far as I can recall - I can go and look if required!!
Ian F
My '72 BGT doesn't have such a tube as far as I can recall - I can go and look if required!!
Ian F
MGCC member
1972 BGT, Blaze, Navy trim, recessed grill
1961 Midget, 948cc, Clipper Blue, Blue trim and weather gear
1972 BGT, Blaze, Navy trim, recessed grill
1961 Midget, 948cc, Clipper Blue, Blue trim and weather gear
Re: Poor Running (intermittent)
I was going too but it's raining...
- Charles Farran
- Posts: 467
- Joined: Fri Oct 31, 2014 11:08 am
- Forename: Charles
- Surname: Farran
- MGCC Member: Yes
- MGOC Member: Yes
- Location: Warwickshire
Re: Poor Running (intermittent)
Apologies Iain,
My 1980 car has HIF carbs which has a small hose connecting the front carb to the rear carb that is hidden behind the air filters. Never the less worth checking that the internals of your fuel hoses aren't breaking down as modern fuels attack old rubber....
Worth checking that the carbs fixing nuts to the manifold are tight & that there are no air gaps.
Cheers , Charles
My 1980 car has HIF carbs which has a small hose connecting the front carb to the rear carb that is hidden behind the air filters. Never the less worth checking that the internals of your fuel hoses aren't breaking down as modern fuels attack old rubber....
Worth checking that the carbs fixing nuts to the manifold are tight & that there are no air gaps.
Cheers , Charles
1980 Roadster
-
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- Forename: Vic
- Surname: Butler
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Re: Poor Running (intermittent)
Charles, from memory only HIF carburettors have that pipe.
1977 Stage 2 MGB GT
1975 SWB Series 3 Land Rover with a later 2.5 petrol engine
1975 SWB Series 3 Land Rover with a later 2.5 petrol engine