Search results

I can confirm that after replacing the blown transistor with the MJE800G unit in the link above the module is fully functional again. I had to buy a used unit to get the part # off of the transistor so now i have an extra (will get it conformal coated at work).

So for everyone's reference if a similar issue occurs here is the replacment Darlington Transistor that controls the Aux Fuel Pump: Part #: MJE800 (obsolete), replaced with MJE800G https://www.mouser.com/ProductDetail/ON-Semiconductor/MJE800G?qs=HVbQlW5zcXXyyLGkvlgkjA%3D%3D I have 2 spliced...

Thank you so much!

Can you link to the better schematic?

Scoobyshep: I did find the schematic in the TM albeit its super tiny in the .pdf from GreenMountain. So it looks like the module's MOSFET directly controls +24VDC power to Aux Fuel pump. Maybe the pump is bad and smoked the module.... I'll investigate the pump tomorrow (found a guy on ebay...

Are you referring to replacing the MOSFET or the module? I could replace the MOSFET if I could find a part # on it. Question is what killed it.

Well my awesome MEP-803A's fuel tank gaskets were in need of replacing and I just replaced the smaller no name batteries with $440 worth of Optima 34/78 batteries (currently sitting at 25.3VDC . I went to test out the Aux fuel pump and put the system to "PRIME & RUN AUX FUEL" without starting...