OK here's the deal. Now that I installed my walbro my fuel pressure gauge has been playing tricks on me! When I start the car and idle it reads 47-49. When I drive it goes to 50-52 under normal driving. If I coast it stays at 47-48. If I get in it, it goes up to 54-57. That seems ok as I was consistently 5 # lighter (40-52)everywhere on the stock pump. The problem is now sometimes it reverts back to those low pressure # :mad: What is wrong :confused: Has anyone else with a fuel pressure gauge experienced this? What do I do to fix or diagnos this? Thanks peps.By the way the gauge is electrical. If that helps any.

How good is that gauge? Put a real gauge on and see if it still is a problem.

The fuel pressure is regulated by the fuel pressure regulator (no duh) and varies according to intake vacuum to keep the flow rate fixed under all conditions.

You could just have a bad FPR or a bad gauge, or the Walbro puts out too much volume for the stock FPR (which I haven't heard anyone say could happen before).