I have been dealing with an intermittent no start issue for about 2 months now. The first no start, i swapped the propane tanks and it fired right up and ran fine.
A couple no starts after that, it start and would run on a small shot of ether. Holding throttle wide open I could crack the propane tank open and it would stay running no problem. Currently, it only runs on ether. Will not pick up the propane. Electronic Lock of verified good. Cleaned up some tar from the inline fuel filter and disassembled, cleaned up fuel converter as tar build up was present. Still no start, acting like a fuel pressure issue but this truck is a bit of a different bread concerning the fuel system and has me stumped. Any ideas would be helpful as both myself and our local service shop/technician are stumped.
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Mike,
Serial number would help with exact system. Take the hose off going to the mixer. Get a cup and fill with water halfway. Cranks engine while hose is in cup and check for bubbles. This will let you know how much fuel is going to mixer. No bubbles no fuel. Take off the top of mixer if you have bubbles and check for torn diaphragm. If the mixer has tamper proof screws, will need to order new mixer, diaphragm is not sold separate due to emissions. There is also a test port on the regulator for fuel pressure. Use a low-pressure gage and I believe a 1/4-inch adapter. Crank engine and check pressure. No more than 4.5 to 5 PSI should be going to the mixer. If the truck is newer, you may have a DEPR. This is an electronic fuel pressure regulator that will also clog with LPG debris. Unfortunately, with the emissions engines must meet, fuel specifications are very tight and cause multiple issues. Good Luck.
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