Finally got a trip in this weekend. Awesome snow. Rode 3 days. Built lots of under hood heat & had the sputtering issue trying to come off of idle a few times while in the trees on day 1... had a couple hot-start/no start issues as well. Fuel pressure appeared to be low when it was sputtering at idle/ barely running (35-40psi). I replaced the fuel pump (pump only -- not the assembly) before day 2 and ran great most of the day... but had a hot start/no start issue again on day 2. Pulled fuel line off & pulled it over a couple times to make sure pump was moving fuel... hooked it back up & then it fired right up.
Day 3, I rerouted the fuel line so it ran below the pipe instead of above it as kidwoo suggested.... burned about 8 gallons of fuel & it worked fine. Had a little burble on restart once but much improved.
Still working on confirming my suspicions... but I think my issue is 2-part: fuel vaporizing in the line & low fuel pressure.
My fuel pressure is a little low for sure (even with the new pump) & think the factory fuel line routing along with my non-insulated aftermarket pipe was vaporizing fuel in the line.
My fuel pressure doesn't "build" each time I pull it over when restarting the sled when hot. After each pull, pressure drops to zero... so takes a really good yank to get all the way to 35-40psi where it tries to fire.
Going to do a little more testing to see why fuel pressure appears low... maybe just the gauge... maybe the regulator... maybe a small leak in the pump assembly.
Will update in a week or two after I get a chance to look it over again. --Matt
Day 3, I rerouted the fuel line so it ran below the pipe instead of above it as kidwoo suggested.... burned about 8 gallons of fuel & it worked fine. Had a little burble on restart once but much improved.
Still working on confirming my suspicions... but I think my issue is 2-part: fuel vaporizing in the line & low fuel pressure.
My fuel pressure is a little low for sure (even with the new pump) & think the factory fuel line routing along with my non-insulated aftermarket pipe was vaporizing fuel in the line.
My fuel pressure doesn't "build" each time I pull it over when restarting the sled when hot. After each pull, pressure drops to zero... so takes a really good yank to get all the way to 35-40psi where it tries to fire.
Going to do a little more testing to see why fuel pressure appears low... maybe just the gauge... maybe the regulator... maybe a small leak in the pump assembly.
Will update in a week or two after I get a chance to look it over again. --Matt