Adjustable FP regulator question

[sgarlic]

Hi guys, here's an easy one. Amazingly, I couldn't find the answer anywhere I looked.

A buddy of mine with a 5.0 Bronco just slapped a Powerdyne kit on. He put an adjustable FP regulator on there, and found that he had a leak, so he swapped the stock one back on. Basically, he bought a second adjustable regulator, which doesn't appear to be leaking, but he's noticed that the FP gauge on the rail stays at 40ish with the stock regulator, regardless of key position (i.e. car off, and car on.) With the adjustable, he's around 40 with ignition on or running, but it drops back down to zero when he shuts it off.

He wants to know if that's normal.

 

[Vipersix]

That really shouldn't be happening unless he's got a return line.

 

[HISSIN50]

Andy, as I'm sure you recall, I'd note that some aftermarket FPR's do tend to bleed of pretty quick (BBK comes to mind). As long as pressure stays copacetic while the pump primes or the engine's running, I wouldn't sweat it. Even from 0 PSIG, he should get back to 30 PSIG real quick (and not having the lines stay pressurized with the car off isnt a real bad thing IMHO).

MHO.
Good luck Andy.

 

[Vipersix]

Let me elaborate... I wouldn't be too concerned about it either. As HISSN50 has pointed out, as long as it maintains the proper pressure without any leakage or leakdown it's not a big enough deal to warrant a new regulator.

 

[sgarlic]

Cool. I'll let him know. Thanks JT and other posters!