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Espar B4L Heater not starting at Elevation

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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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2020 AWD 250 Crew HR 148"
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Totally slacked this summer and didn't start. Been trying to fire it up this week but my pump isn't clicking, unit is trying to start, blowing air etc. Checked fuse panel but nothing blown. Haven't pulled apart yet.

Anyone deal with this? Seems strange pump would go out over the summer.
 

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2021 HR Extended AWD Transit T-250
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Did the heater put up any error codes?

I would check the electrical connection on the pump itself is properly clicked into place. If that is OK, I'd disconnect the electrical connector and check the voltage on the connector to the pump with a multimeter to see if the heater is trying to activate the pump. If you see voltage on that connector and the pump is quiet, then likely the pump has failed.

I recently started mine after not running it all summer and fortunately for me, it fired right up.
 

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Yeah I get the P00012a which is fuel supply / pump but I also get that same error along with others when it fails and shuts off.

Connection at pump seemed solid, couldn't pull it off by hand. Will start checking voltage tomorrow. Thanks!
 

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Try a factory reset. I know that doesn't make sense... but it's resolved issues for us (and others) in the past. 🤷‍♀️
Just curious, what issues have you seen resolved by this? I haven't run across this as a solution before, but I can add it to my troubleshooting guide if it will help others.
 

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Skied Abasin this morning and wish I had it for my pup first thing but wasn’t too cold especially once sun came up.

Got it working this afternoon finally but not sure exactly what the issue was

Tried the reset, no luck

Unplugged pump wire and tried to check voltage but unit won’t even try to start when pump is disconnected so figured that was verification of power to pump

Took pump off and let some fuel drain out

Replaced fuel filter in pump (forgot I bought a couple) it looked yellow but filter seemed ok [emoji2371]

Put it back together and finally started ticking on first attempt.

Took 3 or 4 tries and fired up [emoji869]

Now I have to go back and do the standpipe install and redo the lines before it gets too cold.

Thanks for feedback!
 

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2020 High-Extended AWD EcoBoost Cargo with windows
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Just curious, what issues have you seen resolved by this? I haven't run across this as a solution before, but I can add it to my troubleshooting guide if it will help others.
Any error code we've encountered so far has been cleared with a factory reset. I think we did this two times - maybe more? - before diving into codes that presented as pump or fan errors. My best-guess is some errant input data causes the code; but if they don't return (for months or ever) then it was likely an errant input data issue, not really a fault as logged.
 

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So got a Transit this spring. Installed an Espar M2 B4L. Used the factory aux output from the tank. Worked. That was at 600ft elevation.


Started using the heater this fall and was having trouble starting at altitude. About 6000ft was my cutoff for reliable starts. It would make a pretty loud woomp woomp noise during startup. Louder than at lower elevations. and still worked fine at lower elevations.


Then I found this thread. And consensus seemed that I should install the Espar standpipe. So I did that yesterday. And I’m currently in Colorado at 6700ft. And it still doesn’t work. I see gas going through the line. It seems to get further into the start process than before. But will eventually shutoff with the same error codes.


Now I’m curious what to try next. Ski season is here and I’m feeling pretty annoyed with this Espar. What do you all think? Should i try replacing the pump? It still clicks fine but maybe it was just not up to snuff from the beginning? 🤷‍♂️
 

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2021 HR Extended AWD Transit T-250
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Have you inspected the fuel line for cavitation bubbles on startup? Cavitation is more prevalent at altitude. The fuel line connections, if they are not butted right up against each other can add to the cavitation.

Fuel pump angle must be within spec.

I don't think we've solved this by replacing the fuel pump. I do have a spare that I used to rule that out for my issue. If you are near Evergreen, you are welcome to try it.
 

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I've never been able to get that noise to go away at high elevation. Heater still works right? It's just noisy? Never starts first try either. Did you try the backpack trick I posted a while ago?
 

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Where’s your fuel pump mounted? What Angle? Is it near any heat sources?
 

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2020 High-Extended AWD EcoBoost Cargo with windows
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So got a Transit this spring. Installed an Espar M2 B4L. Used the factory aux output from the tank. Worked. That was at 600ft elevation.


Started using the heater this fall and was having trouble starting at altitude. About 6000ft was my cutoff for reliable starts. It would make a pretty loud woomp woomp noise during startup. Louder than at lower elevations. and still worked fine at lower elevations.


Then I found this thread. And consensus seemed that I should install the Espar standpipe. So I did that yesterday. And I’m currently in Colorado at 6700ft. And it still doesn’t work. I see gas going through the line. It seems to get further into the start process than before. But will eventually shutoff with the same error codes.


Now I’m curious what to try next. Ski season is here and I’m feeling pretty annoyed with this Espar. What do you all think? Should i try replacing the pump? It still clicks fine but maybe it was just not up to snuff from the beginning? 🤷‍♂️
Def curious if you disassemble to do maintenance whether the failed starts have caused / contributed to a build-up on it. 🤔

Or if the, "block the output," trick helps?

And a "factory reset" for sure.

It still seems crazy what a breadth of experiences everyone has had with these things.
 
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