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I'm having the same Espar M2 B4L heater problems at elevation. Works great below 5000', struggles at 7000' - spits and spudders a lot and barely runs, at 9000' it wont run at all. I'm Taking my Transit in to have the 2mm standpipe installed as per the Esparparts.com Tech. R. Lawrence suggests. Taking the van in next Thursday. Who knows.....I hope this helps.

 

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I had the new Transit straw put in As I was having heater problems at elevation. Works at 6400’ but I haven’t been to 8000’ yet. Hoping to get out and give it a test soon. I wonder if the octane grade of gasoline makes a difference. I’ve been running ethanol free premium gasoline in the Transit. Maybe I should try a lower grade of fuel. Any thoughts on different grades of gasoline with the Espar ?.

 

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I sympathize and feel everyone’s pain regarding the Espar m2B4L heater. Mine has been a total pain in the ass as well. Started out with a an improper install by the installer who ran the German wiring harness and the Heatso unit. Quit working after a couple times. I took it to Thermo King in Billings MT. (Never again) who were clueless on Gasoline Espar heaters. Told me to get a new fuel pump. 5 hours drive time and $240 down the drain. Took it back to installer to have interior finished and he never fixed heater but set up a call tag to have me take it out and send it to Espar. ( claimed heater worked fine originally and it’s Espar problem) 7 hour drive time and 5 weeks later and no working heater yet. Took Van to Thermo King in Missoula MT. ( awesome people) who looked at the install and informed me of the German heater and No warranty on it. They took a new heater and tested it with the installed harness and it worked but threw an error code about the mis matched German wiring harness. They would not warranty it with that harness. I said f…k it and replaced the whole unit with one that works and has warranty support. Another $2500 and 6 hours driving time and the heater works. I sent the original heater in and the ECU was bad and was replaced and returned to me. Anyone need a heater? Everything seems to work fine. Now I’m without heat at altitude. I returned to Thermo King (Missoula MT. ) Who dropped the gas tank and put in the Esparparts straw kit. $240 and 6 hours driving time and hopefully the heater works. I’ve only been to 7000’ and it took two tries but it worked. I’ll try at altitude later this spring. I bet I’ve got the most expensive Espar heater in Montana.

 

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RRandTrails, Thanks for the write up. Nice job. I still havn’t been able to test my heater at altitude since having the new Espar straw put in. I’m hoping for the best.