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Old 31-03-2012, 06:24 PM   #1
camparikiller
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Default just utter woe

Right, I can't start my car.

The reason is because of fuel pissing out of the carb, it's a needle valve issue, I've tried three today, none are helping

So....I just refurbished my original German fuel pump, is it possible it's causing too much pressure?

I assembled it on the engine with the push rod at it's highest point, about 12mm it was, I know it's supposed to be 14mm.




The reason I refurbed it was because of fuel in the oil, natually I assumed that the shit arabic fuel pump I have was leaking, however, if it's the valve instead then that might have cause it.

Either way I'm pissed off with shit quality parts because this happens at least once every 3 months.

Here are some pictures taken in anger:-


Immediately after finishing cranking I took the carb cover off:


fuel leaking out of here:-




this is the piece of shit I was using:-




Changed it to another valve of similar quality, except this time it was GUSHING OUT




I'm wound up, I've been out there all day


Symptoms are - really really hard to start, if it does go it's revving really low, no guts at all, stinks of fuel out of the tailpipes

Flat battery now so have fucked it off until tomorrow.

Rant over, any opinions?!
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Old 31-03-2012, 06:35 PM   #2
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Dear Ranter:

The first pic was taken right after cranking engine? That looks correct. The fuel level should be about 19mm (3/4") below the rim of the bowl if the needle valve is working correctly.

The fuel pressure is determined by the spring inside the pump; I doubt that you have excessive pressure.

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Old 31-03-2012, 06:47 PM   #3
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Thanks Jim

Less ranty response:-


About half of the gasket was soaked in fuel too, the rounded part. It seems odd that the fuel level is correct, that's something I noticed too.

It seems there is too much down the throat, a quite noticeable puddle. The fuel squirts down as normal when you pull back the throttle.

When I put the second valve in to test it and got the large gurgling sound, fuel was coming out of the middle pipe on the bottom picture.


So, if the fuel level is correct and the pressure is likely correct, why would there be so much fuel forming a puddle at the bottom of the carb?


Does overfuelling produce the symptoms I described?

I did the valves last week and checked the points today, spot on, so thought initially it could be timing - currently got it statically timed at 7.5 (H1 engine 1969) as per normal - it still won't fire properly. It's a vac-only distributer; was going to do the usual checks with the strobe and then check the idle today, but can't even get it to fire because of this fuel issue.
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Old 31-03-2012, 06:55 PM   #4
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The middle brass pipe is a vent from the bowl. Assuming that the needle valve is shutting off correctly, one other reason that fuel will appear from the vent tube is boiling of the petrol. That can happen after a long hot run if the engine bay temp goes up. But I don't know if you've been able to drive it enough to create that condition.

One last thing I can think of is being parked up facing uphill. That will shift the fuel level in the bowl and let it escape from the vent. Then the needle valve opens, admitting even more fuel which promptly siphons on out the vent.

Beyond all that, I'm at a loss.

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Old 31-03-2012, 06:58 PM   #5
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Oh, wait.

The original VW fuel pumps incorporated a special valve which prevented flooding due to expansion of petrol due to engine bay temps. That expansion created high pressure in the line into the needle valve, forcing it open.

This is a long shot, but maybe the aftermarket pump lacks that feature.

Again, this only occurs under high temp conditions.
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Old 31-03-2012, 07:00 PM   #6
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It's parked completely flat, and you're right, it's not been driven!

I am also at a loss. I'll attempt to track down a Solex needle valve from somewhere and see if that helps.

Thanks Jim



Everyone else - anyone got a spare Solex needle valve?
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Old 31-03-2012, 07:05 PM   #7
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edit:-

I've actually got the original German pump back on it, first time I've used it....

I've put a new diaphragm in it from the rebuild kit, kept everything else the same after cleaning. So it's got one main diaphram in it, the big one, and one square one that sits in the top.

I don't think i messed up putting it back together as it appears to just fit in.

There was a paper gasket that I left out that is the same shape as the top square diaphragm, solely because if you put it in, you can't get the lid on....
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Old 31-03-2012, 07:09 PM   #8
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Just a quick question. Is the main jet (accessed through the side of the bowl) lose?
If it is I reckon it would probably cause over fuelling.
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Old 31-03-2012, 07:19 PM   #9
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is this the main jet?:-

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Old 31-03-2012, 07:22 PM   #10
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ignore that, i just found it!
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