Fuel Pressure Regulator ID

[mikesparker]

Hello all! I've got two FPRs...can anyone tell me why these two are so different? The one on the right came off of my '95 K1500 w/350. The one on the left was taken off another, older 220 TB. Any ideas? Thanks.

 

[L31MaxExpress]

The one on the right is a newer style replacement. It is adjustable. IIRC that unit works with either a 13 psi system or the 30 psi system.

 

[mikesparker]

The one on the right is a newer style replacement. It is adjustable. IIRC that unit works with either a 13 psi system or the 30 psi system.

Thank you! Yes, there is definitely an adjustable torx screw there but I can't get it to move...it's soaking in penetrating oil as we speak. If I can't get it to move, I'll just put it back together as it was. I don't plan on getting a fuel pressure gauge just yet, so the adjustment is irrelevant at this time.

 

[Schurkey]

Penetrating oil doesn't loosen solder/braze/welding. GM melted metal to make that "tamperproof".

I've wrecked more than one TBI regulator trying to make 'em adjustable.

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