[northwestmark]

Not sure if it'd be related, but according to the guy at Esparparts.com you need this standpipe when using the B4L on the transit:

Espar / Eberspacher Fuel Standpipe 300mm

Espar / Eberspacher Fuel Standpipe 300mm 221000201600

www.heatso.com

I was told the same thing. The Ford auxiliary port has a standpipe built in with 3x the diameter needed/recommended for use with the Espar heater. Supposedly thats the issue that'll keep the pump from delivering the right amount of fuel to start it at elevation.