Got the new VP44 on and a FASS DDRP lift pump. Truck runs great, about 20 mpg but as of last night, the fuel pressure gauge is jumping around 2 or 3 psi at idle and about half that while going down the highway. Are FASS products ok with bio ? Or Auto Meter gauges for that matter ?

 

i had my 01 for 7 years now a Fass pump for about 4 i make my own bio at home some in my truck now & its fairly cold here right now.i also have an Autometer fuelpressure gauge.i'v had no fuel rated problems thus far.so it may be your gauge.do you have the electonic gauge?i do & once had the connector where it plugs into the sensor.it looked fine at first glance,so look closely.i was able to get one through my local diesel shop from Autometer.hope this helps.