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Espar B4L Heater not starting at Elevation

37448 Views 322 Replies 60 Participants Last post by  brío
So I installed a Espar B4L in my 2020 transit, under the passenger seat and have a problem with the heater starting when I am at elevation.

I live in Boise ID, at around 3k feet elevation, when down here in the valley my heater starts 99% of the time without issues. When I travel to my local ski area around 6800K feet the heater NEVER starts first try and generally will take around 30+ minutes of trying to get the thing started. Once it does starts at elevation, it will run absolutely fine stopping and starting. When I got back down in elevation it also will always start fine, and then back up to elevation I again have the problem.

Ive completely taken apart the entire gas line from the pickup in the tank all the way to the heater, ensuring rise, fittings, etc are perfect... still have the same problem of getting it started at elevation.

Heatso has been sorta OK to work with, but I feel like they dont really know either. They will be sending me a new ECU (when they get them in a couple weeks).

Has anyone had this problem, is there a trick to getting it started I could use until i get the root cause sorted?

Appreciate any pointers!
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Please let me know if you find a solution. I bought a B4L from Heatso this past summer, and am having the exact same issues. The heater seems to have a rough time starting, but works most of the time at my home altitude of 3k ft. At 6k, it might start after several attempts if I'm lucky. Over 7k, forget it.

Heatso has sent me a new fuel pump. No change. I've replaced all fuel lines and connections. No change. I've sourced the fuel line directly from a fuel canister to eliminate any issues with the tap/standpipe. No change.

Eventually I found the Repair Instructions Manual for M2/S2 heaters. This describes a fuel quantity measurement test. According to the manual, during initial startup, the pump should run for 105 seconds and put out 14.2ml of fuel. I'm getting barely 9ml and the pump runs for 115 secs. Once I told Heatso this, they said it was probably a faulty ECU. I sent my heater back to them. Supposedly they confirmed it was an ECU issue and replaced it. I just got my heater back (after 2 months). I ran the fuel measurement test again, and no change.

I really don't understand how they could have fixed my heater, when I'm still seeing the exact same faulty fuel measurement values as before. I haven't had a chance to retest at high altitude yet, but it's still only working marginally at lower altitudes, just like it always has.
 

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