Hello there,
My mechanic reckons the reason my VW was stalling on hot days (100F+ 37.77cc temperatures) was due to vapor lock. He didn't want an electrical pump fitted in as it would be pumping in the same amount of petrol when it was idling or doing 80mph.
So he fitted in a Pierberg pump - it is mechanical pump. And hopefully it will fix the job at hand.
Cheers,
CC
And he did not know zip about fuel pumps. You can ask him, where he thinks the same amount of fuel as when doing 80 mph goes when the car is idling? To the radiator. It won't go to the engine, that is for sure. There is a method to regulate the amount of fuel pumped to the carburettor and the method is called a needle valve in the carburettor bowl cover.
Change mechanics.
I thought the Pierburg mechanical pumps were no longer available new - I have looked around and can only find Brosol (made in Brazil) fuel pumps.
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" ..... I ain't no bandleader!!"
Um... what radiator? The old aircooled Beetle doesn't have one.
Anyhow I drove the Beetle yesterday long distance and it didn't have any problems this time round. Seems to have worked.
As I said a few days ago. I had the same problem with my bug. Due to the input of this group I installed an electric fuel pump under the fuel tank and had no more problem. I will add I got the pump from auto zone, it is a mexican pump for the beetle rated at 3,5 gpm for under $30 with a lifetime warranty. Your mechanic was wrong and it will not fix your problem.
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Um...I think he was kidding. Here's some info that will shed a little light on what he's talking about:
...............Replacing a bad mechanical fuel pump with a good mechanical fuel pump is possibly a good solution for your problem. Like you said, warmer weather may verify that everything is now OK. It still doesn't make any sense to think that electric fuel pumps don't function adequately. Many have used them over the years without any problems. There must be some ACVW mechanics in Oz who understand this. There are a lot of 'experts' who make their living in the USA by pontificating about this kind of thing while taking their customer's money. The better ACVW shops are getting more and more difficult to find these days. That's why it's becoming more and more necessary for most ACVW owners to 'bite the bullet' and learn to do their own maintenance and repairs. It's the only practical way for many of us to keep our old VW's on the road.
Olli is mostly right, but the valve is called the float valve.
The point is that neither a mechanical nor an electrical pump is a constant displacement pump. They are all intensionally made to be constant PRESSURE pumps, so that they don't even TRY to overwhelm the carb.
------------------------------------------------ Jim Adney snipped-for-privacy@vwtype3.org Madison, WI 53711 USA
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A different mechanical pump won't help vapor lock. Vapor lock occurs on the tank side of the pump and is caused by the interaction of the boiling point of the gas and the suction from the pump.
Once the gas turns to vapor even the best pump in the world is helpless.
------------------------------------------------ Jim Adney snipped-for-privacy@vwtype3.org Madison, WI 53711 USA
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No it will not, unless you have a hole in the fuel-line. Electrical fuel pumps use pressure and not value to decide how much fuel to pump. The stock replacement Electrical fuel pump only makes about 5psi, same as the mechanical pump. SO the needle valve in the car will stop the pump when the fuel bowl is full. It will however pump the tank dry if the fuel-line has a hole or brake in it "without the motor running".
As for "Vapor Lock" the car be fixed by insulating the fuel line where it passes throw and around the motor and engine compartment. And around the trans axle too wouldn't hurt.
Troy74baja
"CARB"
In finnish it is "neulaventtiili" (needle valve). Got to learn the correct terms... ;)
In finnish it is "neulaventtiili" (needle valve). Got to learn the correct terms... ;)
Let's not resort to namecalling here, kids. ;)
Jan
snipped-for-privacy@gulfaccess.net wrote:
Your English is a LOT better than my Finnish. ;-)
------------------------------------------------ Jim Adney snipped-for-privacy@vwtype3.org Madison, WI 53711 USA
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Yes. You really have to improve on that.
Sorry, but the best I can come up with is, "Turin blir best med Bonna pa bena."
And that's from 30 years ago, so I'm not sure of the spelling and even less sure of the nationality....
;-)
------------------------------------------------ Jim Adney snipped-for-privacy@vwtype3.org Madison, WI 53711 USA
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Looks a bit like swedish to me. ;)
Hmmm..., that's what I was afraid of. ;-)
------------------------------------------------ Jim Adney snipped-for-privacy@vwtype3.org Madison, WI 53711 USA
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