H&S Fuel rail plug

Its a hit or miss deal ive installed shims on the 6.7s no issues (usually a lift pump cures low rail issues) or modded pumps were this a Dmax id say go for it as we have a better design for returning fuel snd two more injectors to help bleed pressure.

If you don't have a lift pump get one if you have one id check it and make sure your supply pressure is good still then go from there
 
:thankyou2::thankyou2:
6.7silverbullet said:
I have had mine in for three years no problems, just saying...
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Me too...... never could get my truck to hold rail pressure any where close to the mid 20k range until I plugged it. Couldn't be happier. There seems to be a lot of controversery about this however I personally have never heard of any absolute proof that a rail plug has ever caused any damage.
 
Kalimán said:
:thankyou2::thankyou2:

Me too...... never could get my truck to hold rail pressure any where close to the mid 20k range until I plugged it. Couldn't be happier. There seems to be a lot of controversery about this however I personally have never heard of any absolute proof that a rail plug has ever caused any damage.
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If you couldnt hold 20k on the stock fuel rail relief valve then it already had problems. the fuel rail relief valve is there for a reason (to protect the expensive parts). shimming is the way to go you basically get the same thing as you will plugging but if pressure goes to high it can still relieve through it ,and it won't take as much a chance of damaging parts.
 
Kalimán said:
:thankyou2::thankyou2:

Me too...... never could get my truck to hold rail pressure any where close to the mid 20k range until I plugged it. Couldn't be happier. There seems to be a lot of controversery about this however I personally have never heard of any absolute proof that a rail plug has ever caused any damage.
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Haven't looked to hard have you?
 
Lostnwalmart said:
Haven't looked to hard have you?
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I'm not saying it couldn't happen. All I'm saying is I personally have never seen any proof of any failure due to a plugged fuel rail. I do agree a shimmed rail is "safer". For me the plug was the answer tho. There are plenty of warnings out there saying what will happen but then again there is not one failure due specifically to a fuel rail plug that Im aware of. If there actually is I stand to be corrected. The truth is there are a lot of folks running a plug successfully for many many miles.
 
There are hundreds of engines that fail because of too high of rail pressure, they are becoming less now due to better tuning. Most common is a cracked injector then a run away, many of the people who have a failure like this blame the part that fails but not the cause.
 
Lostnwalmart said:
There are hundreds of engines that fail because of too high of rail pressure, they are becoming less now due to better tuning. Most common is a cracked injector then a run away, many of the people who have a failure like this blame the part that fails but not the cause.
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Hundreds of cummins fail? Now your just making chit up.

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I have never heard of a 6.7 failing from it but alot of 5.9s, but I have never searched it to see what I could find. I do believe the 6.7s can with stand alot higher pressure then the 5.9s though. I run 30-31k at wot and have a shimmed valve and have never had it pop open yet, I have not seen any problems at all running this high of pressure on the rail, lines, or injectors. I have had the engine tore down all the way way too.
 
kmkdiesel said:
I have never heard of a 6.7 failing from it but alot of 5.9s, but I have never searched it to see what I could find. I do believe the 6.7s can with stand alot higher pressure then the 5.9s though. I run 30-31k at wot and have a shimmed valve and have never had it pop open yet, I have not seen any problems at all running this high of pressure on the rail, lines, or injectors. I have had the engine tore down all the way way too.
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And your doing it right. Shimmed or T&C CPRV is the only route. If you do have something happen to escalate rail pressure then a plug will be detrimental. Such as a cp3 going max at any givin time and not backing off.
 
Exactly what psi will the shimmed valve pop at ? And is that not high enough to technically cause a fuel rail or Injector to crack ?
 
Kalimán said:
Exactly what psi will the shimmed valve pop at ? And is that not high enough to technically cause a fuel rail or Injector to crack ?
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It seems they all are a little different, before I shimmed my valve on my current 6.7 running modded pump, mp8 and beta testing the hypertech it would barely open up at around 25-26k and drop my rail pressure down to 20k, if I wasnt all the way in the throttle and could maintain 24-25k all would be fine. After shimming it I havent had it pop open that I know off. I do believe there is a code you get when it does pop open and it must go off of the value in the ecm and seeing a dramatic instant drop in presurre compard to desired pressure.There is also a count in the ecm that keeps track of hw many times it pops open. My count was at 0 a couple weeks ago. Its not really the high pressures that is hard on things its the rail spike that causes the damage, the highest rail spike I have seen is 31k on mine, which is also the high pressure I will run at wot, it makes me wonder sometimes if this is the high it is seeing or is this the high that the sensor is capable of reading. Rail spike might be going alot higher then people think.
 
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