Fass 150 blowing fuses - Chevy and GMC Duramax Diesel Forum
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post #1 of 7 (permalink) Old 01-06-2020, 09:32 AM Thread Starter
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Fass 150 blowing fuses

I replaced both batteries in my truck a little over a week ago. Since then my Fass 150 have been blowing the 10 amp fuse that is on the supplied wiring harness. This never happened in the past. I notice that its blown when I go to start the truck, and just have to replace it once. Today it blew a few fuses immediately. Anyone have any ideas what might cause this?

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post #2 of 7 (permalink) Old 01-08-2020, 06:01 PM
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check the fuse connections,my holder went bad and did this,,plus check the pumps ground.

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post #3 of 7 (permalink) Old 01-08-2020, 06:49 PM
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You clearly have a short somewhere. I'd start by looking at any wiring for the FASS, especially anything in the fuse box. Then I would look at anything electrical in the aftermarket category. If nothing found, then get wiring diagrams and see what is on that circuit and then find the short.

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post #4 of 7 (permalink) Old 01-08-2020, 08:40 PM
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Could it be a bad motor shortening out and blowing the fuse ?
Have you called FASS asking them if this might be the problem or for advice ?
Thatís the first thing I would have checked, constantly blowing the fuse.

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post #5 of 7 (permalink) Old 01-09-2020, 01:10 PM
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Quote:
Originally Posted by D_R_C View Post
Could it be a bad motor shortening out and blowing the fuse ?

Have you called FASS asking them if this might be the problem or for advice ?

Thatís the first thing I would have checked, constantly blowing the fuse.
I know when my AD kept blowing fuses it ended up being a bad motor and they sent me a new one. As soon as I put a new fuse in and turned the key to the run postion a few sexonds later it would pop.

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post #6 of 7 (permalink) Old 01-09-2020, 02:14 PM
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Quote:
Originally Posted by LeRoy View Post
I replaced both batteries in my truck a little over a week ago. Since then my Fass 150 have been blowing the 10 amp fuse that is on the supplied wiring harness. This never happened in the past. I notice that its blown when I go to start the truck, and just have to replace it once. Today it blew a few fuses immediately. Anyone have any ideas what might cause this?
You have a short in the wiring after the fuse. Either the pump winding are shot (unlikely) or somewhere along the harness the hot wires shorted to ground. Really not much else it could be since its a dedicated fuse for 1 system.

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post #7 of 7 (permalink) Old 01-12-2020, 01:09 PM
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This is most likely not the problem but when the water separator needs changing it will cause fuses to blow.

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