What fuel pressure should I set my fuel pressure safety switch at?

[JAvery20]

I dont think the guy that installed my kit ever touched it, so I believe its still set at the stock setting(35psi). Had alil backfire last year from leaning out, so pretty sure its too low. I was thinking it should be around 45-50psi, but how do you even tell on this thing? Im not real experienced w/ working on the kit, just spraying the hell out of the car. :beer:

Any advice appreciated. Car is a 99 vette. Intake, exhaust, gears, nx wet kit, nitrous dyno tune.

[mrr23]

how do you know it was from leaning out because of fuel pressure going too low? backfires are normally from having excessive fuel in the exhaust if it popped out the exhaust.

without having some way to mock it up on a fluid flowing system with a gauge and multimeter would be to keep bringing it up while it's on the car until it won't come on at all. then back off until it comes on then off due to pressure drop. you'll have to have a fuel pressure gauge in the car nad watch it while testing it out.

[JAvery20]

Well it popped from the engine. Actually blew my air bridge in half. I just had it tuned, I was very rich before and was tripping O2 codes. Dropped a size down on the fuel jet too.

So a week later just on the 100 it popped a few times then BOOM. Then we pulled the fuel filter, and it was pretty bad. So after a new fuel filter the car felt much better just on the motor. Thats why i beleive it leaned out, car has been fine since.

[mrr23]

that would do it.