Decided to check my OPS switch (Opening the T valve) and the truck ran for a second then spit and sputtered and died. Nothing came out of the hose and I'd been driving the truck all morning so it was good and warm. I just replaced it about 3 months ago but I used a Napa brand. Should I replace it again or put a new lift pump on? Or replace both? Also what's a good brand OPS switch to get and where to get it? Thanks.

 

Ac delco only for ops and lift pump

 

Napa as far as parts house brands go are good mine went out on a Saturday and could not get a AC/Delco so OPS in my truck is from Napa and has been for 2 years Have you run 12 volts to G terminal with the T valve open if fuel comes out LP is working you might want to do the OPS mod save yourself headaches in the long run.

 

Use AC Delco OPS and google OPS relay mod and install for long term reliability.

 

See Lift Pump Replacement, The Right Way