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prim position on fuel valve

  • Thread starter Thread starter oldbiker
  • Start date Start date
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oldbiker

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My 1980 gs 850 gl has a vaccum operated gas valve with no manual lever exccept for a prim position that requires a small screwdriver to turn ,but turning this has never allowed fuel to pass through to the carbs.I put on a new valve but it too does not work.I took apart the old one and cannot see how this works.What gives?:cry:
 
You should have ON, RES, PRI on the tap. PRI should flow fuel at all times, ON and RES should only flow when the engine is running.

Post a pic of your tap.
 
When in doubt, check the service manual.

Your petcock has a check valve inside, and a pulse of vacuum is needed after you turn the small slot to the prime position in order to get fuel to flow.
 
Suzuki made a petcock in 1980 with no reserve.


hillsy said:
You should have ON, RES, PRI on the tap. PRI should flow fuel at all times, ON and RES should only flow when the engine is running.

Post a pic of your tap.
Click to expand...
 
My condolences on your "dreaded '80 petcock". :o

Nessism has it right. All the others will flow freely when the petcock it turned to PRI, but the '80 model (thankfully just one year and just on the L models, I think) requires just a pulse of vacuum to get it started. Once it is flowing, it will keep flowing until you turn it to RUN or the gas runs out.

.
 
Steve said:
My condolences on your "dreaded '80 petcock". :o

Nessism has it right. All the others will flow freely when the petcock it turned to PRI, but the '80 model (thankfully just one year and just on the L models, I think) requires just a pulse of vacuum to get it started. Once it is flowing, it will keep flowing until you turn it to RUN or the gas runs out.

.
Click to expand...

The "E'" models as well.
 
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