Service & Maintenance Question
I have a yth1848xp tractor with the 18 hp Kawasaki engine....escalated
Service & Maintenance Question posted July 22, 2014 by Dan Cohen
1419 Views, 3 Comments
Question:
I have a yth1848xp tractor with the 18 hp Kawasaki engine. I am having a problem with the fuel delivery on the engine in that as the engine gets warm the vacuum for the fuel pump gets less and less until there is no fuel in the fuel filter and the engine starts cutting out and eventually will not run at all until the tractor cools down again. Each time the tractor is started cold it runs great and will do so for about 20 to 30 minutes depending on how hot it is outside and then it becomes starved for fuel. I have put a new fuel pump and filter on it and also adjusted the valves to the proper spec in the manual. The fuel tank cap is not the problem as the engine will do the same thing with no cap installed on the tank so I have eliminated that. Fuel flow from the tank is excellent too. The only thing it could be is the actual vacuum from the motor that runs the fuel pump itself. What would cause the vacuum to dissipate as the engine gets warm? I would really like to fix this problem properly and have considered installing an electric low pressure fuel pump, but don't want to cause further problems by doing so. Any advice would be greatly appreciated. Thanks!
Answer
We at PPETEN forum went through a very similar problem back in May this year except it was with a Kohler engine that suck the fuel filter dry after 20+ minutes of normal operation time. The final solution was to change all the fuel lines and the filter a second time. I also would check the tanks elbow for a partial blockage.
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Well I took your advise and replaced all the fuel line up to the fuel pump. The fuel filter had only been used for an hour max so I didn't replace it. I also made sure the fuel tank elbow was clear as I used a wire to go back and forth inside it and also blew 100 psi of air through it to clear any blockages. There were none. I already knew I had good flow from the lines as I used them to drain the fuel tank to allow the new ones to be installed. So I just got done using the mower and it is still sucking the filter dry. I am still leaning toward the vacuum issue being the problem. I read that this particular engine has a positive crankcase ventilation system and am wondering if this could be the problem with the motor not giving enough vacuum to suck the fuel through the pump. I cannot imagine that the motor is losing compression as it gets hot because it just runs so darn good otherwise. If it had a continuous supply of fuel it would run forever. Still considering using an electric fuel pump. Could the motor actually cause the fuel pump to stop working due to a vapor lock of some sort? I have enough fuel line to put new line from the pump to the carb, but I figured once the fuel reached the pump it wasn't going to be an issue especially now that the mower is still acting the same way. Any other suggestions?
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I am having the same problem with a Husqvarna LOGTH2448T lawn tractor with a Briggs 24 hp OHV model 445677. I drained the fuel from the tank and changed the fuel filter, and fuel pump. Ran a bottle of "mechanic in a can" through the carb for 5 minutes then let the engine cool for 4-6 hours. I refilled the gas tank and ran the engine for 30 minutes cutting grass only to have the the ##$%^& engine shut down again! I tried choking the carb to suck fuel and that worked once or twice but then it finally just quit. When I checked the fuel filter, it was near empty! What to do?
Mike K.
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