1978 Puch Maxi Luxe Fuel Leaking

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1978 Puch Maxi Luxe Fuel Leaking

Postby Zander » Sun Dec 27, 2009 11:02 pm

I just bought this moped, and now realize that when it sits idling, fuel drips off of the bottom of the motor at a high rate. Any suggestions as to what could be the problem and how to fix it? Thanks!
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re: 1978 Puch Maxi Luxe Fuel Leaking

Postby John » Mon Dec 28, 2009 6:34 am

Wipe it down and try to follow the trail/track of the fuel.
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re: 1978 Puch Maxi Luxe Fuel Leaking

Postby supercub » Mon Dec 28, 2009 10:07 am

Hopefully its' the petcock seal or the float bowl gasket. Easy stuff. The petcock nut is a combination right and left thread, check the manual for messing with it.
The tank takes a bend horizontally for a bit, going above the motor. That is the very bottom of the tank. Check by taking off the air filter and looking or swabbing into the round hole in the side of the frame for gas. It may be hard to acess that area for patching but if the tank is rusty that may be a tell tale sign of a weak frame.
Hopefully not, but Marine Tex for patching over clean bare steel on the outside, with Kreem or other tank sealer for the inside, following the directions to the tee.
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Re: re: 1978 Puch Maxi Luxe Fuel Leaking

Postby RebelMob » Mon Dec 28, 2009 3:06 pm

Replace the fuel line and add in a fuel filter - you will need to do that anyhow even if it is not where it is leaking - use clear line only for fuel line.
To trouble shoot the source of the leak do as John suggested and wipe down to see if you can see the source. If it is sort of coming from somewhere and nowhere or whatever you can use some of the blue chalk powder they have in the hardware store for chalk lines. Puff some on the lines around the carby and the tank and look for where the light powder colour turns dark (it is usually blue but there is red and green chalk also).
Like SuperCup mentioned - follow the sealing compound instructions exactly - or you might mess up the tank or have to do it over again.
Processed on shared equipment that may have come in contact with nuts.
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re: 1978 Puch Maxi Luxe Fuel Leaking

Postby MotoVerde » Mon Jan 04, 2010 9:18 am

It's probably some dried up goo on the float needle seat.

http://www.mopedarmy.com/wiki/Fix_a_leaky_Bing
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re: 1978 Puch Maxi Luxe Fuel Leaking

Postby MotoVerde » Tue Jan 05, 2010 11:58 am

I had to clean out a bing yesterday that was doing the same thing. As suggested in the above link I put a Q-tip in the chuck of a drill, put some Brasso in the hole and let her rip! Worked incredibly well!! Just thoroughly rinse out the carb when done.
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re: 1978 Puch Maxi Luxe Fuel Leaking

Postby jay d » Mon Feb 01, 2010 11:12 am

check frame for pinhole leak
i just found one yesterday on my76 maxi,gas tank leaking
when we all are on mopeds we will be happy
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