john_p_b
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| posted on 18/3/06 at 03:37 PM |
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webbers fitted, but......
spent the best part of the day in the wind and cold fitting the 40's and new ignition system to my pinto.
wired everything up, plumbed everything in decided to go for it. ignition was a mile out so sorted that got a spark when needed and in the right
place.
fettled with the dizzy and in the end started but missing so again fettles the dizzy a bit, only made it worse not better. do the idiot checks make
sure all 4 are sparking and sure enough they are. starts engine took plug leads off 1 at a time and basically 3 and 4 made no difference at all.
conclusion, no fuel!
so there's my situation, 1 and 2 are getting plenty of fuel and running perfectly but 3 and 4 are getting nothing. took the top off the carb
checked the floats they are moving fine and there's fuel in the float chambers but it's going nowhere from there.
whats next to do folks?
bit worried i might learn a harsh lesson here about buying 2nd hand carbs from ebay!
built a car, built a home, had a family. lost the family, lost the home, still got the car.
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stevebubs
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| posted on 18/3/06 at 03:42 PM |
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Your jets are probably blocked.
Unscrew them and soak in carb cleaner.
Also get a copy of "how to build and powertune webers and dellortos" - will help a great deal.
S
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chris_harris_
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| posted on 18/3/06 at 03:42 PM |
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May sound like a daft question but have you checked that the linkages between the two carbs are, well linked. and activating both carbs at the same
time. have a look down the throats and see if the butterflies are opening. just a thought?
Regards Chris
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john_p_b
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| posted on 18/3/06 at 03:46 PM |
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carbs are both working together all linked up.
i did think jets steve but my dad argued with me about it being both sides letting no fuel in but i have to confess i work mainly via guessing with
carbs! basic stuff i can handle but all i work on is oil burners at work!
built a car, built a home, had a family. lost the family, lost the home, still got the car.
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chris_harris_
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| posted on 18/3/06 at 03:50 PM |
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By the process of elimination theres no harm in taking the jets out and soaking them as steve suggests, at least then you'll know its not them.
Failing that it may be a top off and have a look job, will probably mean an overhaul kit though. Good luck!
Regards Chris
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rusty nuts
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| posted on 18/3/06 at 04:36 PM |
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Double check inlet manifold gaskets/seals are not leaking on rear carb . No/low vacuum causing no suction on fuel?. Does the engine run OK with open
throttle ? if so sounds like rear carb is not open enough. Adjust on balance screw . Try screwing idle screws in fully and turn out a couple of turns
. If/ when running on all four balance the carbs using balance tool or small hose to listen to suction. While you have the jets out check them all
and note the sizes , make sure each is the same? at least you should have a starting point for jetting . Also check the choke sizes are all the same.
Are the carbs a matched pair? check the numbers
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mookaloid
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| posted on 18/3/06 at 05:20 PM |
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I thought I had that problem once - turned out it was my head gasket failed between pots 3 & 4 
Good luck
Mark
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907
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| posted on 18/3/06 at 05:35 PM |
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You havn't got No's 3 & 4 plug leads the wrong way round have you?
Paul G
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john_p_b
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| posted on 18/3/06 at 05:40 PM |
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rusty, manifold is as tight and it's gonna get, tightened everything up before trying to start it. makes no difference really what position
throttle is in it still misses but when i open the choke on the carb for 3/4 it runs faster but still missing?
also with the engine not running, open the throttle fully and i get vapour out of front carb but nothing from the rear.
mark, shouldn't be a head gasket problem i hope! it ran fine last time i had it out before i fitted the 40's
built a car, built a home, had a family. lost the family, lost the home, still got the car.
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john_p_b
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| posted on 18/3/06 at 05:40 PM |
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quote:
Originally posted by 907
You havn't got No's 3 & 4 plug leads the wrong way round have you?
Paul G
nope, timing is fine i'm just getting no fuel out
built a car, built a home, had a family. lost the family, lost the home, still got the car.
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907
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| posted on 18/3/06 at 05:47 PM |
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With it running on 1 & 2, squirt petrol in the carb inlet of 3 & 4.
If it's blocked jets it should briefly run on all 4
Paul G
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britishtrident
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| posted on 18/3/06 at 06:44 PM |
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Simple things first
Most likely case is the carb (throttle) balance between the front and rear carbs is a mile out
After that you have to set the balance then set the mixtures then rebalance then the mixtures again.
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Agriv8
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| posted on 19/3/06 at 10:53 AM |
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fuel float valve stuck shut is another possibility ( no fuel to resovior will mean no fuel to jets )
Long shot but what about swapping the two carbs over if problem stops with the suspect carb at least you know where you are heading.
does the beer mat trick work with those in the same way as a blocked su ( ie getting it running and blocking it of so it pulls neat fuel through ?
Just a thought
regards agriv8
Taller than your average Guy !
Management is like a tree of monkeys. - Those at the top look down and see a tree full of smiling faces. BUT Those at the bottom look up and see a
tree full of a*seholes .............
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keith2lp
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| posted on 19/3/06 at 08:48 PM |
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Hi John
I had a similar problem when I set mine up, it turned out to be the balance between the front and rear pair. When I balanced them and set up the idle
mixture they ran fine.
Keith
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omega 24 v6
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| posted on 19/3/06 at 09:19 PM |
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Keith I've ggot a pdf file here on DCOE's that might help you out. U2U youe email and I'll send it to you.
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MrSandMan
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| posted on 19/3/06 at 09:53 PM |
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quote:
Originally posted by john_p_b
when i open the choke on the carb for 3/4 it runs faster but still missing?
also with the engine not running, open the throttle fully and i get vapour out of front carb but nothing from the rear.
This suggests that fuel is not getting into the rear carb. The accelerator pump works independantly from the main jets and it id thsi which gives you
misting on presssing the throttle. This suggests no fuel from the accelorator pump or from the main jets. I would check that the needle valve is not
blocked or jammed.
Next step would be to strip the carb and soak all bits in Cellulose thinners. Jets can be checked on rebuilding.
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