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Vaccum petcock convert without replacing?

  • Thread starter Thread starter Anonymous
  • Start date Start date
I'm not sure what exact problem your valve is causing, but I also had valve problems. My solution was to buy a $4.00 spring loaded vacuum ball check valve and put it in line with the vacuum hose between the carb and the fuel valve. Poof.... like magic...and it was only $4.00 in stead of $90.00. No muss, no fuss.
 
Oh. Forgot to mention. All functions of the fuel valve work as they were intended to also. (Pri,Run,Res)
 
I'll have to admit to a lack of understanding of the vacuum system here. I wouldn't have thought to put a valve in-line with the vacuum hose. I thought about just putting an off/on valve onto the fuel line in between the petcock and carbs and just leaving the petcock on reserve but sometimes it seems like even the reserve closes up from time to time and I have to take the vacuum line off of the carb and siphon to pop the fuel valve open because the engine isn't doing it.
 
Ah. Now I understand. You are haveing a problem with lack of fuel. It sounds like the vacuum isn't getting to the fuel diaphram. Putting a check valve in line won't help you then. If your petcock is like mine, there is a "built-in" check valve in the vacuum "cover", ( the part of the petcock assembly that has the vacuum port to put the hose from the carbs onto). In my case, that "built-in" check valve was decintegrated. That made the fuel diaphram act like a fuel pump and pressureized the fuel system. You too may have a problem with this "built-in" valve. I removed mine completely. But if you do that, you WILL have to put a check valve in the vacuum line or it will pump fuel in sted of simply opening the fuel diaphram.

A bit long winded. (sory) But, hope it helps somehow.

Good luck.
 
Thanks Don. With as much trouble as this thing has given me I just bit the bullet and picked up the pingel adapter plate and the cheap petcock to fit it:

http://www.z1enterprises.com/detail.aspx?ID=1744


Hooked it all up, it fit great and solved the problem...that is until gas started leaking from under the gasket that's provided with the adapter plate :|

I'm hoping that I just didn't prep it well enough with the sealing compound. Going to clean it all off and try again, we'll see.
 
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