High pressure relieve valve

[EB]

Does anyone know how to plug off or shim this valve on the fuel rail. My truck is in the shop to have the third one replaced. I haven't run my edge box since the first one went out in Dec. so it isn't an over pressure issue from a box, I never ran higher than level 2 anyway. This valve is a "star" part and the dealer has to get permission from DC to order it. The dealer can't stock this part and I have to wait for it to come in. This is starting to get old and is costing me quite a bit of money since I make my living with this truck.

I'm also having a problem with injectors, but that is a story for another day.

 

[lmills]

yes there is a couple people selling rail caps. I am more than certain one will chime in shortly.



they are

NADP

Floor-it diesel and

NGM diesel

 

[Mark1si]

Call Wade @301-884-2175 he will hook you up! I am ordering one also.

 

[1965LONEWOLF]

what is a rail cap and whats it do ?

 

[Mark1si]

A rail cap holds the pressure in the rail. It doesnt allow any return back to the pump.

 

[1965LONEWOLF]

well i have a 2004. 5 325/600 and i will be puttimg on a tst box and a fass 150 pump (just the pump itself) going to hopefully fun it threw the stock fuel filter , so do i need rail cap ?

 

[Diesel Power]

Does anyone know how to plug off or shim this valve on the fuel rail. My truck is in the shop to have the third one replaced. I haven't run my edge box since the first one went out in Dec. so it isn't an over pressure issue from a box, I never ran higher than level 2 anyway. This valve is a "star" part and the dealer has to get permission from DC to order it. The dealer can't stock this part and I have to wait for it to come in. This is starting to get old and is costing me quite a bit of money since I make my living with this truck.

I'm also having a problem with injectors, but that is a story for another day.

Oo. hey man i can get you a stock set up or you can be done with the problems and we can get you a rail cap kit, pm me for priceing or you can call. thanks :-laf

 

[TCluff]

I TOOK ONE OF MY RELIEF VALVES APART AND THE SPRING INSIDE WAS PRETTY SMALL AND HAS VERY LITTLE SPRING RATE, I AM NOT SURE HOW IT GETS DAMAGED SO EASILY UNLESS IT COIL BINDS, I USED SOME CATERPILLAR SHIMS TO TIGHTEN IT UP, IT FEELS THE SAME AS A NEW ONE, BUT I DONT KNOW WHAT PRESSURE IT IS SET AT SO I TOOK IT OFF IN CASE I LOSE ANOTHER ONE... ... I WILL HAVE A WAY TO GET BY UNTILL I GET A NEW ONE

 

[Diesel Power]

A rail cap holds the pressure in the rail. It doesnt allow any return back to the pump.

thats correct it allows you to get the most out of your cp3, stock or mod :-laf

 

[Diesel Power]

I TOOK ONE OF MY RELIEF VALVES APART AND THE SPRING INSIDE WAS PRETTY SMALL AND HAS VERY LITTLE SPRING RATE, I AM NOT SURE HOW IT GETS DAMAGED SO EASILY UNLESS IT COIL BINDS, I USED SOME CATERPILLAR SHIMS TO TIGHTEN IT UP, IT FEELS THE SAME AS A NEW ONE, BUT I DONT KNOW WHAT PRESSURE IT IS SET AT SO I TOOK IT OFF IN CASE I LOSE ANOTHER ONE... ... I WILL HAVE A WAY TO GET BY UNTILL I GET A NEW ONE

Oo. the problem is not the pressure of the spring but that it can not handle constant cycling that a pressure box can produce----even stock power can kill them... ... .

 

[1965LONEWOLF]

it won t hurt anything ? it seems only a few are doing it

 

[EB]

The problem I had was that it was taking longer and longer to crank (start) the truck. I went over a week with never shutting the truck off after I finally got it started in the morning while out on a run. Friday morning I was leaving the house to go on a job and it wouldn't start at all. Missed that job, one later that afternoon and one for tomorrow morning. Like I said, it is costing me money.

Diesel Power, I'll be calling you Monday.

 

[TCDiesel]

EB, I would be more concern with what is causing it. Just a thought, if you install any type of restriction you may find what is the main cause with allot more expense than a valve.

 

[Diesel Power]

EB, I would be more concern with what is causing it. Just a thought, if you install any type of restriction you may find what is the main cause with allot more expense than a valve.

the only thing thats causes valves to go are the quality of the material in the valve ( 1st suspect) or the pressure box your running is on constantly---the valve cant handle stock pressure in most cases

 

[1965LONEWOLF]

so if i use my tst box all the time on 3/3 or 4/4 i m going to have valve problem ?

 

[TCDiesel]

the only thing thats causes valves to go are the quality of the material in the valve ( 1st suspect) or the pressure box your running is on constantly---the valve cant handle stock pressure in most cases

He is on his Third,almost all of the issues associate with this valve is spike Pressure, NOT constant, your thought on quality control on three valves is highly unlikely.

 

[Diesel Power]

so if i use my tst box all the time on 3/3 or 4/4 i m going to have valve problem ?

no, i said pressure box---heavy pressure boxs, timing and duration ( tst ) is fine

 

[Diesel Power]

He is on his Third,almost all of the issues associate with this valve is spike Pressure, NOT constant, your thought on quality control on three valves is highly unlikely.

sorry bud but i have seen a record of 6 valves replaced on one truck also a 03, the valves are not very strong, what else do you think would cause the valve to break?---pressure box or weak valve! right, the cp3 only makes 23,209 max in stock form!!

 

[EB]

I am not running a pressure box. It has been a stock setup, since December. I ran the edge ez on level 2 for about 270,000 miles without any problems. Since I have taken it off I have gone through 2 of the valves. Maybe I should put it back on.

 

[Diesel Power]

I am not running a pressure box. It has been a stock setup, since December. I ran the edge ez on level 2 for about 270,000 miles without any problems. Since I have taken it off I have gone through 2 of the valves. Maybe I should put it back on.

somthing you may want to consider is the symtoms of a bad cp3 are the same as a bad valve! you may want to check the return flow on the cp3 before you buy another valve :-laf