I've read a few times on here with people having problems w/ idle and 450cc. For those of you who have an adjustable FPR and have adjust for 38-40psi might be interested in something that i read yesterday!

I read that the fuel press should be 38-40 psi when the vac line is DISCONNECTED from the regulator. and should read 28psi when CONNECTED.

This would make sence since when idling (VAC) you want a lower pressure and while steppig on the gas you want a higher press (no vac, hence disconnected vac line).

any thoughts!?

UPDATE: I just read the fuel press testing in my service manual and it has been confirmed that the info is accurate!!

 

Mine won't go that low.
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With the vac line connected it wont go down to 28psi? do u have a pump and/or aftermarket FPR?

 

Mine seems to be at 20 with the line connected.. Gay... Its prolly cuz of the fuel pressure releif mod I did to my fpr when I had my big pump in to try and lean my car.. damn smc.

 

heh...set the pressure with the vac line off. BINGO! Should work like a charm ...stock is 38-42 at WOT which means if you disconect the vac line you'll be sorta simulating wot....so yeah...set your fuel pressure with the vac line off.

 

I have a BBK 255 pump and a B&M FPR. It only goes down to about 40-42 psi with the line connected.
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Damn...and your running n/a with stock compression? You gotta be running majorly rich if you are....

 

Hook up a vac gauge and see what you get, if you have low vacuum at idle your FPR wont work right. Low timing or worn rings will give you low vacume, or a big vacuum leak.

 

No, it's boosted with all the goodies.

I think it's just the FPR. I always thought stock fuel pressure was about 38psi. My vac has always been good. I lost a bit when I installed my cam though. It went from about 22in. to about 20 at idle, but the idle is a bit rough.
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did u try T.O.O mod where u drill a hole..

the B&M regulator, is it a entire unit or just a cap n the stock regulator?