Wondering how accurate testing fuel pressure regulators on the bench with air would be?
I've been using this to set up Injector Pods with serviced injectors, stock regulators converted to adjustable with new springs and set fuel pressure before installing them on a vehicle. With a known pump the pressure on vehicle is always spot on! So it's a good tool. But wondering how far I could push it for testing springs and accuracy?
One thing I learned about air as pressure and testing different springs! You can hear the regulator flutter when pressure in is in range of spring pressure and adjustment of regulator! It does not flutter and make noise if fuel pump pressure is higher or lower then spring capability's. The regulator is either stuck closed when not enough pressure to open regulator and fuel goes through bypass, or regulator is blown wide open if it's not strong enough for pressure. Either way there is little to no adjustment from regulator at these highs and lows.
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