When the larger mixers are applied to smaller engines, enrichment for acceleration or power occurs too high in the RPM range to be practical. Use of a mixer that is too large for the engine displacement makes idle adjustment extremely sensitive. It is important to correctly size the air flow capacity of the mixer to the engine requirement. Be sure the PCV valve does close properly after the engine starts. The orifice in the PCV valve, which is open during cranking and closed under vacuum, can add a sizeable amount of air. Air leaks may also be found in the engine, through intake valve seals or past rings, which are not seated. This technique is quite effective around the gasoline carburetor area. If a leak is located, the engine will speed up due to the richer mixture. Vacuum leaks may be detected by spraying gasket sealed surfaces with a soapy solution. A primer may furnish the added fuel around the metering valve to allow the engine to start, and with more numerous intake cycles the leak may be overcome. In extreme conditions, air enters through the leak during the entire stroke, while the gas valve is lifted only during part of the stroke. Any leak downstream of the air gas valve will reduce the amount the valve will rise off its seat during cranking. In dual fuel applications on small displacement engines, an air leak, which would not bother a larger engine, becomes critical, especially at cranking speed. Improper location of electric fuel lock head.Incorrect location of carburetor, regulator and or fuel lock.However, with dual fuel applications, especially those under 250 cid, there are many factors that can contribute to hard starting. Starting has never been a serious problem when dealing with single fuel alternate fuel engines. You might try changing the spark plug gap to around. Propane and natural gas require from 50% to 100% higher temperature to ignite a charge as compared to gasoline. If propane or natural gas make up more than 10% of the fuel air charge, the spark plug will not ignite the mixture, it is too rich. More starting problems are caused by over priming or dirt on one of the regulating seats causing gas to leak through. Problem:Įngine won't start or is hard to start. Your tank may be over filled or oriented wrong. Frost is always caused by drawing liquid from the tank. Is it possible the vapor pressure reduction and flow is causing this? Answer: I have a vapor withdrawal kit and the engine runs fine for a while and then frost starts to form on the regulator. If you want to install the conversion kit by connecting into a pressure line at a reduced pressure or low pressure, call us. Our propane conversion kits are made to connect to full propane tank pressure. Almost all conversion kits are designed so that the engine will loosed power if the load adjusting screw is opened too far. This lean mixture is often caused by too many pressure regulators in the system or some small or restrictive fitting causing poor flow. In most cases poor power is caused by a mixture that is too lean. Problem:Įngine runs but won't come up to full speed or power. At that air flow, always set the gas idle mixture screw for fastest speed. This adjustment controls the throttle butterfly valve opening at idle and in turn the idle air flow. Idle speed should be controlled with the idle stop screw near the governor. Never attempt to control idle speed with the idle mixture. My engine was idling too fast so I closed down on the idle mixture screw to reduce the speed but it runs rough. Keep working the speed down and keep the idle needle screw adjusted until you reach the desired idle speed. Slowly reduce the speed and as the engine tends to run a little rough, open the idle needle screw just enough to make it run smoothly. You should close off the idle screw completely, open the main load and get the engine running okay at governed speed. This wrong combination will run the engine at one speed and load. This is probably caused by the idle screw being open too far, and the load screw turned in too far. I can get the engine to run at one speed and load okay, but it won't run right if I try to speed it up or slow it down.
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