87 Formula; 5.0 L; 5-speed; low fuel pressure. Idles okay - stumbles bad as soon as step on gas to pull out. Fuel pressure at idle is around 18 psi (should be around 40). I picked up a new pressure regulator. The new regulator looks exactly like the old regulator. The new regulator included a baggie with 8 O-rings of various sizes. Why? What are these for? The original regulator didn't have any O-rings anywhere. There was no mention of the O-rings in the minimalist instructions that came with the regulator. Unfortunately, one of the tamper-proof T10 torx bolts broke off and now I have to deal with fixing it.

Any guidance would be greatly appreciated!

- Jimmy

 

Just a guess, but probably for the injectors or the fuel rail.

 

They're for the fuel rail

 

great... thanks.

 

Update. In the process of putting the new pressure regulator on, one of the six tamper-resistant T10 screws broke off. I attempted to drill out the broken screw and put in a self taping screw - but it leaks. Does anybody know the part number for the pressure regulator base assembly? Is there any chance I can find a replacement base assembly or will I need to replace the entire fuel rail assembly? Any ideas or suggestions?

Thanks. Jimmy

 

The saga continues. As mentioned above, one of the TT10 screws broke off when putting the new regulator on. I ordered six new screws from Fastenal. All they had that were close were slotted screws #6 x 40. I just tried the new screws and they start but only go in about 2 turns before stopping. I got out a powerful magnifying glass and it looks like these screws have 42 threads/inch. Does anybody have any idea where I can order screws these oddball screws? I haven't visited the junkyards yet, but I suspect that is my next step.

Does anybody know the exact size of these six screws?

thanks.
- Jimmy

p.s. In the above diagram added by badSS; these are the six screws that attach the regulator to base (#240).

 

A lot for screws but they have them on eBay.
if you need a fpr body let me know I have one I’d sell.

https://www.ebay.com/itm/TPI-Fuel-Pr...oAAOSwzd9cLOmJ

 

Thanks! I don't see the size listed on the ebay link... I'll post a question to the seller.

 

I've an old rail assembly I won't ever use. You can have it for shipping and a 6pack.

 

Metric. 3.5mm.

 

https://www.microfasteners.com/scm35...ric-alloy.html

https://www.thirdgen.org/forums/tpi/...tor-bolts.html

 

Excellent - Thanks!

 

8Mike9 - Thanks for the offer... Let me see if I can use the replacement I just purchased. I may get back to you.