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I have an air dog 100 Lift pump with a SPD5 switch truck is slightly tuned and deleted deleted is the air dog 100 too small for my truck when I get on it it throws up code low fuel rail pressure
 

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I have an air dog 100 Lift pump with a SPD5 switch truck is slightly tuned and deleted deleted is the air dog 100 too small for my truck when I get on it it throws up code low fuel rail pressure
The AD 100 or FASS 95 will handle up to 600 HP which should be plenty for a slightly tuned Duramax. You would need to check if your fuel filters are dirty or if you are dropping pressure from the pump when applying a heavy load. Pressure from either unit should measure between 8 to 10 psi at the discharge side of the pump. Dean
 

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2016 Chevrolet Silverado Duramax
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When I installed my airdog lift pump, I, replaced the main filter on the engine also. Replace the main filter and see if that solves your issue.
 

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Replace your filters depending how many miles on them and if it still happens send a log to your tuner
 
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