My GPX30 starts and runs for a short time then stalls. It will run for 20-40 seconds at a slow idle before it dies. It'srunning really lean- if I press on the accelerator it dies right away. If I try starting it again right away it will catch for a few seconds or not at all, but if I let it sit for a few minutes it will run longer. The longer I wait the longer it runs, up to about 40 seconds. I'm not really familiar with propane systems, but it seems like it isn't getting enough fuel. It seems like some component slowly fills up like a reservoir and allows the system to run, but then there isn't enough flow to keep it going. It has an Impco 100 with a vacuum regulator. There is coolant going from the vaporizer to the regulator, and there is a strong vacuum at the hose going to the valve cover breather. I pulled the back side of the regulator and the diaphragm looked good. I played with the timing and checked the rotor and cap-they aren't perfect, but it doesn't misfire so I don't think that's a problem.
For the record, I had just fixed another problem (fwd/rev not working, directional fuse blown) and I had the instrument panel off and the directional switch disassembled, and when I put everything back together the stalling problem started. I can't see how the two are related because I don't think the Impco system has any electrical connections, but it was running fine before that (other than overheating from low coolant), so the timing is a little suspicious...
Showing items 21 - 23 of 23 results.
I have a funny feeling the Model J just happened to go bad while you were working on the dash (I've seen it before)
I would do the following:
Bleed the line from the propane bottle to the vaporizer (bleed it away from you- it's very cold & EXTREMELY flammable- make sure no open flames & plenty of ventilation for fumes to dissipate) & hook line back up to bottle
Start engine-if engine fails to start- just quickly crack open & close the propane bottle shut off valve.
Once engine started- let engine begin to run out of gas- as engine begins to stall- crack open (very quickly) & re-close the shut off valve once again. Engine should pick up & run normal once again.
If you can keep the engine running doing this procedure then the Model J regulator is faulty (passing to much fuel & flooding the engine). Replace with the newer Cobra regulator.
Pretty sure it's a J. I'll check the pressure. Does the oil pressure switch interact with the regulator or carb? I feel the button on the regulator pulsing if I push it while cranking the engine, and when I stop cranking the button pushes out hard- I can't hold it in.
Ther is a couple possibilities, 1)... When you had dash apart a wire for the oil pressure switch broke or came loose( going to the light in the dash)..or the PSI switch itself maybe bad....2) the regulator,even tho it " looked god" May need rebuilt/replaced..,or possibly the Diaphram in the air mixer needs replaced,just a few things to check.....on the back of the IMPCO. regulator(probably a model J?) there is a 1/8 pipe plug,put a pressure gauge here and see what your pressure is,should be around 2-3 PSI I believe.....IF you plan on replacing the regulator,I recommend installing a IMPCO Cobra model regulator,they are more reliable than the model J,little more $ put worth it in the long run,TRUST ME
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