Classic cars forum & vehicle restoration.

Alextriumphfan · Joined: 26 Nov 2008 Posts: 6

Hi,

Posting for a friend.

Car starts and runs for a while then starts to falter. Backing off gas then it goes OK again. Changed fuel pump and filter but still not right.

Any ideas folks???

Anything specific to this model???

Thanks

Rick · Site Admin Joined: 27 Apr 2005 Posts: 22449 Location: UK

Carb jets clear?

R
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Nic Jarman · Posted: Wed May 19, 2010 2:20 pm Post subject:

Could be a blocked petrol tank breather.
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Phil - Nottingham · Joined: 01 Jan 2008 Posts: 1252 Location: Nottingham

Is glass sediment bowl clean?
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Jim.Walker · Joined: 27 Dec 2008 Posts: 1229 Location: Chesterfield

This can be a symptom of water droplets in the carb. As fuel flow (demand) increases and other jets come into use water droplets can be "sucked" (not technically correct terminology) onto the jet, effectively blocking it until the demand falls. The surface tension of water prevents it passing through most jets in a carb. Constant depression carbs excepted, which can sometimes be cleared by revving and momentarily blocking the air intake.
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michael1703 · Joined: 22 Jul 2009 Posts: 349 Location: suffolk

air leak /running lean?

at idle, if you press the piston lifter plunger does it stall/rev/remain same ?

baconsdozen · Joined: 03 Dec 2007 Posts: 1119 Location: Under the car.

I had the same problem on a P5B rover,I cleaned out the filters and checked for air leaks,drained the tank and generally played about for hours with no luck.Finally I took the main fuel pipe off and after poking about with wire and blowing through with an air line managed to shift a load of crud and the car (touch wood) has run smoothly since.
I think the muck settled on one of the bends or a join and was compacted under high demand effectively sealing the pipe.
Best of luck anyway.
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