Cutting out at 50...

[Alex573]

Hi everyone. So yet another issue has cropped up, just as I thought we were ready to get camping...

Last weekend the van cut out at low speed headding to traffic lights. It was a hot day and we'd been a long way. It didn't want to restart and when I pushed the accelerator nothing happens in terms of revs. After a few mins however it did start and was then fine. Untill hitting 50 on the motorway... At which point the van juddered and lost speed. I kept it juddering along at 40 and got off the slip. Pulled in a layby and it was fine. Drove home no problem.

Took it out today and the same thing. Twice at 50 after a few mins the juddering slowing happened. I had to pull over. Once it stalled and was tricky to restart as again nothing happened with the accelerator.. I must add it's intermittent and not every time does it happen.

So I'm left thing;
Fuel issue?
Accelerator or cable sticking in some way?
Plugs or condencer not working as they should?

Does anyone have any thoughts? Thanks a lot!

Alex

 

[sparkywig]

Ask gvee, he suffered from something similar last year.

 

[69billy]

50 !! your flash. mine hits the sound barrier wall at 48.. she wont take any more captain.. :lol:

 

[gvee]

Check your fuel filter.

 

[Alex573]

Thanks. I'll have a look. I've got a spare so might be worth changing it anyway?

All ideas welcome!

Cheers.

Alex

 

[K@rlos]

Fuel pressure, Carb is running out of fuel. Check pump, filter and lines for blockage.

 

[ozziedog]

It does sound like it could be a fuel supply issue. The first thing I`d do is try and work out roughly where we`re looking at. If you pop the pipe off the carb from the fuel pump, pop it into a litre water bottle so it`s on it`s side and make sure the pump has enough gumption to squirt all over the bottom of the bottle with the bottle on its side. If it does, then the problem is past there and if it dosen`t then the problem is before there. Also look for shagged pipes and filters, also tank filters and hidden filters also anything else that may have been modified in the fuel supply like cut off valves etc etc. If the pumps good and the pipes are clear from the pump, it could be the entry point to the carb, like a valve and seat possibly crudded up and jamming or the wrong level on your float, after that you got to be looking at cleaning out your carb.Also check your air filters are clear. :mrgreen:

Ozziedog,,,,,,,,,,,,,, Good luck matey :mrgreen:

 

[Alex573]

That's fantastic! Thank you so much for that. I put a new fuel line between on the carb so perhaps it's before there. I'll follow the steps. I think I'll change the filters anyway and go from there.

Cheers guys!

Alex

 

[Trikky2]

That's fantastic! Thank you so much for that. I put a new fuel line between on the carb so perhaps it's before there. I'll follow the steps. I think I'll change the filters anyway and go from there.

Cheers guys!

Alex

If you changed the fuel line recently then its also possible there is a small piece of rubber partially blocking the needle valve in the float chamber.

To check this you need to take the top off the carb, remove the needle vave and also flush a little petrol through to ensure there's no remaining debris in the pipes.

Since this is more of a faff I suggest you check the other stuff first though.

A quick way to see if the lines, filters and pump are ok is to disconnect the coil, take the fuel pipe off the carb and put the end in a jar, get somebody to briefly turn the engine over. The pump should give healthy squirts of fuel.

Don't forget to re connect the coil afterwards - guess why I say that :lol:

 

[ozziedog]

That's fantastic! Thank you so much for that. I put a new fuel line between on the carb so perhaps it's before there. I'll follow the steps. I think I'll change the filters anyway and go from there.

Cheers guys!

Alex

If you changed the fuel line recently then its also possible there is a small piece of rubber partially blocking the needle valve in the float chamber.

To check this you need to take the top off the carb, remove the needle vave and also flush a little petrol through to ensure there's no remaining debris in the pipes.

Since this is more of a faff I suggest you check the other stuff first though.


A quick way to see if the lines, filters and pump are ok is to disconnect the coil, take the fuel pipe off the carb and put the end in a jar, get somebody to briefly turn the engine over. The pump should give healthy squirts of fuel.

Don't forget to re connect the coil afterwards - guess why I say that :lol:

So!! You`ve fallen for this one Mr Tricky, I am so glad it`s not just me On a side note, we was having a chat one time, that`s me and a good mechanic pal of mine and he had said virtually word for word what you have said above. What the issue was in the end , was the actual description of a healthy squirt, and how you`d describe it to someone without as much mechanical prowess such as me. Between us we came up with the one to one and a half litre water bottle led on its side, the pump should be able to squirt it up to the end of the bottle or there abouts, my fuel pump however at three or four months old could only manage a 1" squirt which was pretty feeble up to a new one but was OK if there was a full tank and funnily enough I broke down on a steep hill with a quarter of a tank of fuel, so the repro pump just couldn`t do it and bit the dust.

Ozziedog,,,,,,,,,,,,,, We like cheap crap don`t we :roll: :roll:

 

[Trikky2]

So!! You`ve fallen for this one Mr Tricky, I am so glad it`s not just me On a side note, we was having a chat one time, that`s me and a good mechanic pal of mine and he had said virtually word for word what you have said above. What the issue was in the end , was the actual description of a healthy squirt, and how you`d describe it to someone without as much mechanical prowess such as me. Between us we came up with the one to one and a half litre water bottle led on its side, the pump should be able to squirt it up to the end of the bottle or there abouts, my fuel pump however at three or four months old could only manage a 1" squirt which was pretty feeble up to a new one but was OK if there was a full tank and funnily enough I broke down on a steep hill with a quarter of a tank of fuel, so the repro pump just couldn`t do it and bit the dust.

Ozziedog,,,,,,,,,,,,,, We like cheap crap don`t we :roll: :roll:

:lol: Define a good squirt :lol: Yes your idea sounds right to me.

Interesting about the repro pump. Not come across that one before. The pushrod draws the pump diaphragm down so the pump pressure is entirely dependant on the spring under the diaphragm. The old pumps came apart so you could mess with stuff inside but the modern things are a sealed unit

I prefer the days when you could carry a spare diaphragm and a spare valve rather than a whole pump [moaning old fart smily]

I know about the bit of rubber in the needle valve problem from my first car back at the end of the 60's when I was a teenager with hair It was a hard learnt lesson because the bit of rubber would run back down the pipe when I disconnected it - hence the need to squirt the pump while its off just to make sure. It cost me many hours and much dismantling to learn that one :lol:

 

[Alex573]

Thanks for all the tips gents! I'll give it a go!

Alex

 

[Alex573]

Hi chaps. Just an update. I've had a look through these steps but not found anything. I've decided to bite the bullet and sent the van off to an air cooled specalists to make sure everything's up to scratch and check the set up.

Massively appreciate all your help!
Alex

 

[sharky71]

could it be a fubar'd condensor??

just a thought,i'll be quite now

 

[jonboylaw]

Or dying coil....


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[Alex573]

I'll see what the engine specialist comes back with. I've decided there are limits to what I can achieve on my own : )

 

[crede999]

Fuel pressure, Carb is running out of fuel. Check pump, filter and lines for blockage.

Yep

 

[Mr Brightside]

Fuel pressure, Carb is running out of fuel. Check pump, filter and lines for blockage.

Yep

Sounds very similar to a problem I had last year.

The new (non genuine) mechanical fuel pump was giving too much pressure to my ICT's. I fitted a weber style regulator & set them up with a pressure gauge. After a while at 50+ mph it would see signs of fuel starvation (as you describe). The regulator, whilst supplying the correct pressure (I had it set at 3 psi) was restricting he flow severely at high speed.

Solution was to junk the repro fuel pump & filter & fit a Huco low pressure electric pump with safety relay & cut off switch.

All sorted out & is trouble free now.


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[madmike]

What's a 'Weber style' regulator? If it's the 'Dial 'type they are PURE JUNK :roll:

 

[Mr Brightside]

What's a 'Weber style' regulator? If it's the 'Dial 'type they are PURE JUNK :roll:

No, it's not the dial style, it's this one, but also pure junk

http://www.machine7.com/product.php?xProd=466 #machine7 via @machine7_vw

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