Check with ATTA, if I remember correctly they have a solution to the Ford check engine light issue with aux tanks.
As for the two pumps, I'm assuming you're talking about the small green Mr. Gasket fuel pump part #12D, I went through 2 of them. The first one lasted about 15k miles and only failed because I forgot to turn it off and the tank had run dry so I burned the pump up. The second one lasted about 3k miles.
I now have the Holley version that looks like the same pump, but black housing. It looks like it's the same, but actually operates differently. That one has been running now for about 50k miles without a problem.
To be honest, the pumps don't really run much. If you have them installed correctly, all you need to do is turn the pump on for a few seconds to establish a syphon and it'll just about drain the entire tank into the main tank while you drive. Every now and then it'll break syphon and you just have to turn the pump back on for a few seconds to get it going again. I reset my gallons used setting on the truck when I refill the tanks so I know how much fuel is in the aux tank since I never added a gauge to it. When I've used 65 gallons and the main tank is full, I know I've drained the aux tank.
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Brent
2013 Alpine 3500RE
2019 Silverado 2500HD Duramax
U.S. Air Force Retired (25 yrs)
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