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fass or airdog

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Looking at putting a aftermarket lift pump on my 98 12 valve.....
When installing a fass or airdog do they go right to your injection pump or do they still go through the stock filter
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If you buy one with water separator and filter, you bypass the stock fuel canister.

Curious why you would do this mod on a 12v..??
 

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Discussion Starter · #3 ·
Also have one of the other brand(duramax)and was having fuel pressure problems(long story)and had a 95/150 on that so i moved up in size and no more fuel pressure codes!!! So I have a nice 95/150 with filters that I thought would go good on my dodge
 
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