The electric fuel lock-off solenoid functions properly and isn't restricted. It appears to be getting a signal from perhaps the alternator as it will only energize when the engine rotates. It does not energize with the key switch on start or run. There is liquid propane to the convertor/regulator. I have not measured the pressure as I don't know exactly what it should be. We have verified base engine timing is correct by removing e valve cover, rotating to the tdc mark on the crank pulley and verifying that the distributor is aligned with #1 cylinder with #1 valves both "loose". When it was running we rotated the distributor advanced/retarded and it seems to be adjusted properly based on how it idled and ran although I have no advance specification. I read about 8* advanced but not sure this is correct. The crank pulley has three timing marks and I have no explanation of which means what. We are going off of the largest notch which if I recall is in the middle. We have used two fresh full tanks of propane and they are verified good as they work on his other forklift. We used a spark tester and all plugs are firing. We cleaned out the intake manifold as there was a tremendous buildup of crap, mostly black crud that was gooey which I assume is carbon and unburnt propane. The coolant system is topped up and operating properly. The regulator/converter does not ice up when running. Vacuum during cranking bounces around 5in mercury. I never did check running vacuum. I hooked up a vacuum pump to both the old and new convertor and the vacuum lock off works. I tested the vacuum advance on the distributor and it didn't seem to work, but I can hardly see is as the issue as we did have it running well with this same distributor. We tested compression and all cylinders are at 170psi. Cranking speed is good and we have the battery on a charger when testing and cranking. The oil pressure dummy warning lamp goes off when he engine has been started. There is no Murphy switch that I can see. We have cleaned out the intake pipe that bolts to the carburetor and replaced most of the vacuum hoses. We have tried to run without the air filter to see if it was clogged but that made no difference.

There appears to be some sort of governor under the carb but I dont know how it works. We tried to manipulate it by hand with the cover off but it didn't change anything. It bounces around as it uses a vacuum hose to ported vacuum rig above the carburetor inlet. I assume it regulates intake air based on vacuum but have no information to confirm. There is an adjustment for it but it is safety wired and we have not adjusted it. We have not touched the throttle plate stop but have tried with the throttle at several positions and cleaned the entire carburetor with brake clean. When the throttle is at maximum there is some sort of "accelerator pump" on the carburetor but I have no idea it's use or operation. There is a solenoid on the side of the carb that does seem to work, but I don't know it's significance. We tested it and it energizes, and we tried jumping it with direct power but it solved nothing. There is a plate under the carburetor that vents to what appears to be a crankcase breather bolted to the side of the engine block. I plugged the hose to see If we had a vacuum leak but that solved nothing. I am assuming this is an emissions device but can't confirm. I removed the check valve inline with the hose from the carb to the piece on the block and cleaned it with brake clean. It moves freely when you jiggle it as it should in a regular gasoline engine. I am in need of someone who Is experienced enough to have dealt with this type of lift. It seems the issue is that there might not be significant enough vacuum to pull in the propane perhaps. Sometimes you can hear the propane vapor escaping into the carburetor when you crank, and other times you hear nothing. I am a heavy duty Diesel engine mechanic by trade. If someone has specs on pressures I have all the tooling needed to check. Also the convertor has a scare to adjust the distance that one of the vacuum operated membranes moves but I have no information on its proper adjustment. Any and all help is appreciated guys!

P.S.

I have tried to determine how to get some photos uploaded but didn't find any information. I have pictures of the forklift, the carburetor, the regulator/convertor and the data plate. The serial number is 404FGC25-20778.

Ben