has anyone ever shimmed a fuel regulator on a 6.0

You can do it with a .177 BB under the spring in the housing. Some have "streched" the spring for the same affect.

HeavyAssault's Sig:

im a rookie with the whole fuel regulator if you dont mind is it possible to explain where its located on the truck were to get the part and etc thank you for your time

and just what shimming it does for you. better performance? help egts? or just what?

Stumblefoot's Sig:

2007 Ford F250 Super Duty, 6.0L AFE stage 2 dry cold air, Bully Dog PMT, Zoodad, line of fire lights, EZ down tailgate, wilson cell phone amp. XM satellite radio.

There is a pressure relief valve on the side of the upper fuel filter assembly. When fuel PSI exceeds 60+PSI the valve is pushed open to allow fuel to return to the tank. I'd have to find a picture of it to show you exactly where it is on the assembly.

I think the thought is that this would allow more fuel to go to the heads versus going to the tank.

See item labled "Fuel Regulator"
Page 30: Fuel Supply System

Fuel system info
Page 28: Fuel Supply System

Not the best idea from what ive heard, the Orings will start to fail.

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2004 F350 6.0 SCT w/ TSD tunes, straight pipe, S&B intake, 8in fabtech, 38*15.50 kumho m/t, 20in XD revolvers, F&R replacements, 07 harley headlight, custom painted grill 3.5in DP
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1968 dodge d200 38000 orig. mi

You are correct!

Shimming the fitting with a 3/16 spacer behind the spring in the fuel regulator. This is located on the right hand side of the fuel filter. You will see a 3/4 brass nut there. The spring is inside there. Shimming will raise the fuel pressure and often give you a worthwhile increase in power and no one that I can recall has reported higher fuel consumption.


Read more: Shimming Fuel Pressure Regulator For Power

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You can get a updated spring from gillette diesel. It is a little stronger than the original

I typically give the springs a little stretch, to get the fuel pressure up to INTERNATIONAL specs, not the Ford spec, which, in my opinion, is a little low.

Big Angry Hillbilly's Sig:

2008 F-350 4x4 Off Road 6.4 PSD 23+ MPG
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310-S Ontario Motor Vehicle Mechanic
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Modification Friendly Dealer Technician - Just don't try and hide it from me.

What's INTERNATIONAL list for the spec?

thankyou for all the feed back i think im just going to order a new spring from gillette diesel

OK, you guys got my attention. Since I ALREADY HAD a FUEL PRESSURE GAUGE INSTALLED I thought I would try the "BB" and verify the results.

My 2003 6.0 fuel pressure was running below what I thought was acceptable. Measured via the IDP adaptor line with a liquid filled 'permenantly installed' under hood gauge I was running about 48 PSIG at idle and 45 PSIG at WOT (in park).

I installed the BB and the results are as follows:
65 PSIG at idle
63 PSIG at WOT
I am very happy with the BB Mod. I can't say every truck will get the same results but it worked for me. I didnt stretch the spring and couldn't see paying $20 to Gillete for a spring.

So the conclusion is after 118K miles on my 03 "IT WORKED"

What's the International spec for fuel pressure?

Please don't consider me an expert, I get all my intell from these forums but everything I READ says International spec. is 70 PSIG. Ford spec is 55 PSIG "I Think".

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