tries to cut-out on acceleration

[eg0u3067]

Hey,

a problem developed recently, which involves loss of power on acceleration, also sometimes cutting out altogether, and bucking. But the problem has become more the engine trying to cut-out when I open the throttle. Heres a link to a vid of the issue: http://gallery.me.com/a.birch#100004/Van" onclick="window.open(this.href);return false;

Ive read through all the related discussions i can identify on this forum, heres a list of things ive tried:
- checked spark plugs - used but good condition
- checked air filter - fairly clean with no difference when removed
- checked and renewed vacuum hoses
- sprayed carb cleaner around carb-manifold gasket and manifold-engine gasket to check for leaks - no difference in engine run
- batteries strong and new - plus worked fine for months before
- cleaned pipe from breather to carb - no sign of crud
- dismantled air intake system and cleaned - no sign of crud + didnt do much to engine
- fuel filter on engine renewed recently
- when problem initially started i was told it could be crud from air pipes getting into jets, so they need clearing. So when running i covered the carb with hand and revved to increase vacuum, and a couple of times it worked. but then it stopped working and now wont rev properly (see video at link above).
- another suggestion was that there could be a build up of water in the float which is getting into the system, however from what I gather you cant clean the float without taking the carb off which i'd rather not do.

Also a silly question maybe, but what am I adjusting in this image?
http://gallery.me.com/a.birch#100004/Va ... olor=black" onclick="window.open(this.href);return false;

Getting a bit annoyed with it now.
Andy

[1_eyed_jim]

In the video it looks like its drawing in air from the 2 other holes in the top of the air box on the carb where studs and bolts should be? (currently only one by the looks of things)

[CovKid]

Its being starved of fuel so think along those lines. Checked the cone filter? The hidden one?

[Ian Hulley]

fuel filter on engine renewed recently

Do you mean the in-line one next to the petrol tank ? If not then that's the only one there should be and a likely candidate. Have you measured the fuel pump rod (MUST be 100mm)

Ian

[Cruz]

Crap in car blocking jets?

[kevtherev]

Cutting out on accel is fuel related.
As I read it no mention has been made of the accelerator pump.
This pump has a diaphragm which had a common problem of splitting and not squirting neat fuel into the primary venturi.
Take off the pancake duct. hold the choke flap open and opperate the accelerator.
You should see a good squirt of fuel from a little tap like jet.
Try accelerating VERY slowly. ..Does it still stall?
If no then I would say its the pump.
OR...
You have a serious air leak. Maybe the servo hose?
Or a cracked gasket.
OR....
Water ingress is another issue
check the fuel filter has no water polution
water is heavier than fuel so its easily seen
let some out into a jar and check it

[CovKid]

If its kicking back when you get to a certain speed and only gets power once you've reduced speed considerably, the float bowl in carb is simply running out of fuel - hence mentioning the hidden cone filter. If its partially clogged you'll get reduced fuel delivery and under high demand the carb will run almost dry. The filter is tucked inside brass fuel inlet on carb and can be fetched out (its a push fit) with a self tapper or wood screw. They get accumulated muck in them - generally limescale from any moisture in the petrol or assorted flies and debris . A good rub between finger and thumb under a warm tap (little detergent if needed) will remove it. Dry thoroughly and refit. If not that could be sticking float bowl valve or other suggestions above. A weak fuel pump can also produce these symptoms too I guess but rule out fuel delivery restrictions first.

[eg0u3067]

Thanks a lot for the input guys.

Today I changed the Fuel filters on the output and return sides of the petrol tank (I noticed that the return pipe doesnt have a filter in the haynes, but shes run perfectly well with this extra one for the time ive had her so ill leave it in). These were very full of crud and she's now running better, but the problem is still there sometimes. Im guessing some some of the crud could still be in the system, so ina give her a good wash out with a £20 tank of petrol n see if that helps. In fact ill clean the carb filter first.

About the image in the first post, im guessing this is the value to adjust the idle air/fuel mixture?

Thanks again for all you help, ill chase this problem do n let you know the outcome.
Andy

[R0B]

I would of thought that having a filter on the return pipe would hamper the flow.Back to the tank

[T25Convert]

^^^ WHS.

I'd get rid of that - you don't need to clean the petrol goin back into the tank. Its unlikely to be causing your problems, but it might start causing some others in the future!

Cheers,

Alex

[eg0u3067]

Ok issues have changed somewhat!

It's gone from running bumpy n occassionally cutting out to stalling straight away when started. I put new fuel pump thinking it was the issue but it's still doing it. Now I give her a little pump of fuel before starting her, start n she fires up n runs fine for 2-10 seconds, then cuts out!

I've checked the tap like jet in the carb and it is giving a squirt but I'm not sure if it's sufficient?

Most annoyingly of all is that every once in a while, say few hours, she will start n run perfectly for 5-10 minutes before cutting out again?!

Very frustrated with issue now, poison all out of ideas.

Andy

[T25Convert]

Hi,

If its constantly stalling then check fuel is getting to the carb - take the fuel outlet pipe off the pump and crank the engine - fuel short come squirting out the pipe (catch it and don't smoke!!)

If it does then the probelm lies within the carb (it looks like it might be a webber - if it is there is no brass conical filter to check) or is non-fuel related.

If no fuel comes out check to see if fuel is reaching the inlet side of the pump - if not you may have a knackered tank outlet, blocked (hidden) fuel filter or some other obstruction.

Check the push rod length as Ian said, I've just found out that anything less than 100mm is a disaster!! Also check that the plastic stand is intact.

Good luck!!

Cheers,

Alex

[eg0u3067]

Thanks for all your input and help guys, turns out that a good blast of compressed air down the carb seemed to fix the problem, so I guess it must have been a crap in the carb issue. A lesson learnt here.

Andy