Help please update - Page 2

Alan · 06-07-11, 08:45 PM

Yes to all, what do you think.

Hanuman · 06-07-11, 09:07 PM

From all that is written so far, I'd hazard a guess that fuel supply to the carb is not the problem. It's probably a problem within the carb/setup. And that is an area that I am sure there are people on this site, who are very able to answer. Sadly, my involvement with carbs ended 20years ago. Other than anecdotal stuff half remembered.

Isimmo · 06-07-11, 09:09 PM

Quote:

Originally Posted by The Real MSH!

Sadly, my involvement with carbs ended 20years ago. Other than anecdotal stuff half remembered.

Ah, that'd be the Jet Lag and the Guinness then? No?

Hanuman · 06-07-11, 09:12 PM

Quote:

Originally Posted by Isimmo

Ah, that'd be the Jet Lag and the Guinness then? No?

No
Guinness lag, and jets. It's all in the detail!

Isimmo · 06-07-11, 09:15 PM

Quote:

Originally Posted by The Real MSH!

No
Guinness lag, and jets. It's all in the detail!

Might be carb icing in this seasonally cold weather?

There again, might just be a stuck needle.

Phil Payne · 06-07-11, 09:57 PM

I'm assuming you don't mean the classic 'three pumps'?

All Type 81/Type 85s with carburettors require three (?) pumps of the throttle before starting to engage the bimetal strip on the side of the carburettor properly. This is documented in the Owner's Handbook.

Alan · 06-07-11, 10:05 PM

I wish it was that simples

missfire · 06-07-11, 11:43 PM

i don't know which carb you have but any i worked on years ago had an 'accelerator pump' which injects, effectively, fuel down the barrel of the carb. when you push the accelerator down.. sounds like thats what is keeping he engine fueled. the pumping, if you pardon the expression.

which, by my skewed logic, would mean.. no fuel coming out of the jets. which could mean (as isaiahmmo said?) float chamber needle 'stuck' or float chamber very low level of fuel.

i'd get the fecker on the dining room table, strip it and rebuild it. 'set it' back up, (float level, idle/mixture screws etc.) if you can find instructions (someitmes even haynes manuals will do). grease up anywhere that could present an air leak, (throttle butterfly spindle bushes etc.), make up all new gaskets, or buy them if you are a modern 'type', make sure everything else is 'working' i.e. choke. and no air leaks anywhere.

but thats just my way, stripping the thing and starting from scratch will take less time than endless hours guessing.

edit - a punctured float would fail to open the needle i suppose.

Hanuman · 08-07-11, 10:40 AM

It would make sense, what Miss Hot stuff

is saying.

If it starts normally, then there must be fuel available in the float chamber. If it fails to run after, then the float chamber is not filling.

Is there a filter at the carb end of the supply?

steveb · 08-07-11, 11:25 AM

Check the rubber mounting the carb sits on, they split, letting extra air.

Check for air leaks on the manifold etc, otherwise carb off and clean it all out, pref with air line.

06-07-11, 09:07 PM	#12
Hanuman Trickster Classic Audi Club Member Join Date: May 2009 Location: Heckling from the cheap seats, Phnom Penh, KoW Posts: 7,006	From all that is written so far, I'd hazard a guess that fuel supply to the carb is not the problem. It's probably a problem within the carb/setup. And that is an area that I am sure there are people on this site, who are very able to answer. Sadly, my involvement with carbs ended 20years ago. Other than anecdotal stuff half remembered. __________________ I wish they would keep the damned Chinese away now that I can go home, so that I can enjoy Fish amok and a draught Angkor

08-07-11, 10:40 AM	#19
Hanuman Trickster Classic Audi Club Member Join Date: May 2009 Location: Heckling from the cheap seats, Phnom Penh, KoW Posts: 7,006	It would make sense, what Miss Hot stuff is saying. If it starts normally, then there must be fuel available in the float chamber. If it fails to run after, then the float chamber is not filling. Is there a filter at the carb end of the supply? __________________ I wish they would keep the damned Chinese away now that I can go home, so that I can enjoy Fish amok and a draught Angkor

08-07-11, 11:25 AM	#20
steveb Senior Member Classic Audi Club Member Join Date: Jul 2008 Location: West Berkshire Posts: 1,155	Check the rubber mounting the carb sits on, they split, letting extra air. Check for air leaks on the manifold etc, otherwise carb off and clean it all out, pref with air line. __________________ [FONT] '76 Leyland Princess 2200 HLS '79 Scirocco storm '84 WR '89 coupe quattro '01 A2 1.4 TDI SE '14 A3 1.4 TFSI COD [/color][/size][/font]

06-07-11, 08:45 PM	#11
Alan Grown up member Join Date: Aug 2010 Location: Cambridge Posts: 86	Yes to all, what do you think.

06-07-11, 09:57 PM	#16
Phil Payne Banned Join Date: May 2010 Location: Sheffield Posts: 1,809	I'm assuming you don't mean the classic 'three pumps'? All Type 81/Type 85s with carburettors require three (?) pumps of the throttle before starting to engage the bimetal strip on the side of the carburettor properly. This is documented in the Owner's Handbook.

06-07-11, 10:05 PM	#17
Alan Grown up member Join Date: Aug 2010 Location: Cambridge Posts: 86	I wish it was that simples

06-07-11, 11:43 PM	#18
missfire making wooden things Classic Audi Club Member Join Date: Dec 2009 Location: cow land Posts: 8,154	i don't know which carb you have but any i worked on years ago had an 'accelerator pump' which injects, effectively, fuel down the barrel of the carb. when you push the accelerator down.. sounds like thats what is keeping he engine fueled. the pumping, if you pardon the expression. which, by my skewed logic, would mean.. no fuel coming out of the jets. which could mean (as isaiahmmo said?) float chamber needle 'stuck' or float chamber very low level of fuel. i'd get the fecker on the dining room table, strip it and rebuild it. 'set it' back up, (float level, idle/mixture screws etc.) if you can find instructions (someitmes even haynes manuals will do). grease up anywhere that could present an air leak, (throttle butterfly spindle bushes etc.), make up all new gaskets, or buy them if you are a modern 'type', make sure everything else is 'working' i.e. choke. and no air leaks anywhere. but thats just my way, stripping the thing and starting from scratch will take less time than endless hours guessing. edit - a punctured float would fail to open the needle i suppose.