Release Valve Shim Kit?

[James Hess]

What exactly does it do? i read that it reduces the amount of fuel returned to the tank but what does that mean, is that saying more fuel is sent to the motor? i also read that it was really cheap at less than 10 bucks, is this a worth it mod or something to waste your money?:confuzeld:

If anyone knows about this mod i would love to hear some pros and cons so i can decide if i want to do this. :Handshake:

What are yalls opinions on the Air Dog fuel system compared to the FASS system? Which one offers more for the money, i know they both do the same thing but my question is more like which one works better and is actually worth the money and not just a name or hype.

[hondarider552]

What exactly does it do? i read that it reduces the amount of fuel returned to the tank but what does that mean, is that saying more fuel is sent to the motor? i also read that it was really cheap at less than 10 bucks, is this a worth it mod or something to waste your money?:confuzeld:

If anyone knows about this mod i would love to hear some pros and cons so i can decide if i want to do this. :Handshake:

What are yalls opinions on the Air Dog fuel system compared to the FASS system? Which one offers more for the money, i know they both do the same thing but my question is more like which one works better and is actually worth the money and not just a name or hype.
the shim can help stop the 0087 code from coming up when you run out of rail pressure, it doesnt stop the code, i tried that.

I would buy a TTS single or dual IMO, the fass and airdog you can see where it is, but the TTS is hidden, by bolting to the oem fuel cooler. quick connects for the TTS and clean install.

[Crazy_Steve]

I thought it was a p1093?

Anyways...a while back i bought the 'race valve' from PPE that eliminates the spring alltogether.

My stock valve was tightened by the hand of God...so that never got installed. ):h

[diesel6.7]

We have installed a couple of those kits here at the shop..... have seen what we thought to be good results with the shiming, and to this date, we have not heard any complaints from the customers..... seems to be an inexpensive mod... the one truck I remember working on did have a P1093 code.....

as far as FASS and Airdog, both great systems with great reliability... I like the FASS a little better...just my opinion, but as far as bang for the buck, its a tough call, like I said they both work great...

[Timthecarman2004]

We use and sell many FASS systems. The install is done in the frame rail and looks very nice. The new systems are almost silent, so many people do not know that it is even there. Also many of the dealerships do not mind the system as they have seen the benefits.

[James Hess]

See i heard that the FASS systems were fairly loud and that the air dog systems werent, but you just stated that the NEW systems arent loud so cool. Thanks for the replies i was just curious. :Handshake:

[madmaxdmax]

...Or you could make your own version. Another project James ?):h

[hondarider552]

...Or you could make your own version. Another project James ?):h
bilge pump :lol:

[James Hess]

bilge pump :lol:

HAHAHA ):h, That was pretty good:thumb:. I figure it would have to be one heck of a pump.

I wouldnt even begin to know how to make my own setup lol.

Back to the shim kit though how exactly does it work and what are the performance gains seen from this? Is it well worth the 10 bucks or so to do this and will it cause any major problems? Some of yall said it will throw a code, is that just because its puttin out more fuel than it should and the computer reads it as operating irregular and can you fix that code with EFI Live?

[Timthecarman2004]

The shim kit will keep more fuel in the rails and more pressure available to the injectors. That is a quick way to explain it. The kit is supposed to fix the problem that the LLY's and LBZ's have with return fuel. The rail releases too much pressure and the truck falls on it's face. The filter is the culprit some times, but more often it is the relief valve in the rail. The best way to fix this is shimming the rail, and then installing a lift pump of some kind on the rail. This keeps fuel in the filter, and keeps the truck from limping.

Hope that helps some

Tim

[James Hess]

Yeah bud thanks for the reply, you said that it keeps the truck from limping but i thought limping was from the tranny not being able to hold the gears when big power is pushed through. I was just wondering about this cause i am thinking about doing it to my truck and was just wanting a bit of info on it.

Do you know how exactly it is installed? I spose when i do it i will do a write up on the install for a DIY im not a very good author though ):h.

[blksmok]

You can have a trans limp or an engine limp. This is to deal with an engine limp due to the fuel rail pressure being less than commanded due to the FPRV letting fuel return to the tank rather than keeping pressure in the rail.

You really only "need" to do this mod if you are getting the p0087 code due to the FPRV blowing open. There is a test called the "bottle test" that will determine if your FPRV is in fact blowing open and only after that has verified that the FPRV is letting fuel get past it, should this mod be done IMO. This is not a difficult mod, but it is easily screwed up and could lead to more costly repairs, if done incorrectly or if something happens to the valve while doing the mod. This is another thing on the truck that was tightened by their 1000 lb gorrila IIRC.

[James Hess]

Ok im starting to understand how it works and why after yalls replys. But my question still stands what kind of performance gains if any will this mod bring around that is if your not fixing a low rail pressure problem? I am considering doing this cause i would like a bit more fuel and if its not going to the tank then its going to the motor but again how much more and what are the gains to be had.

[blksmok]

Ok im starting to understand how it works and why after yalls replys. But my question still stands what kind of performance gains if any will this mod bring around that is if your not fixing a low rail pressure problem? I am considering doing this cause i would like a bit more fuel and if its not going to the tank then its going to the motor but again how much more and what are the gains to be had.

It won't make any difference for you. You can have all the fuel pressure you want in the rail and the engine is still only going to receive what you command in the fuel tables. (it would just spray the amount of fuel you requested in a shorter time due to increased rail pressure) Also, this mod alone won't increase pressure in the rail because that is determined by the commanded fuel rail pressure. This mod is only needed if you are currently blowing fuel past the valve. It has no benefits other than keeping the valve closed, but your valve is staying closed already so... :confuzeld:

[IOWA LLY]

He has an LLY, his code would be a 1093. LBZ would be 0087.


James, this mod is only helpful if you get one of these codes.

[James Hess]

Ok now i am getting it then.

So in other words if your demanding a large amount of fuel(tweaked fuel table which would push more fuel and cause the valve to open due to higher pressures and cause the codes) and your valve cant hold the pressure then this is the mod for you but for someone who has a stock fuel table its worthless(unless you have plans for later on). :thumb:

Did i understand that the right way?:)

[blksmok]

He has an LLY, his code would be a 1093. LBZ would be 0087.

James, this mod is only helpful if you get one of these codes.

Correct. Good catch, thanks.

Ok now i am getting it then.

So in other words if your demanding a large amount of fuel(tweaked fuel table which would push more fuel and cause the valve to open due to higher pressures and cause the codes) and your valve cant hold the pressure then this is the mod for you but for someone who has a stock fuel table its worthless(unless you have plans for later on). :thumb:

Did i understand that the right way?:)

I think you got it. :thumb:

[James Hess]

Cool, look yall i learned somethin HAHA ):h

Thanks for the input yall.

[hondarider552]

Cool, look yall i learned somethin HAHA ):h

Thanks for the input yall.no problem :lol: