Rail Pressure Troubleshooting

[AH64ID]

Sure looks like summer diesel.

I don't really think it sounded like a fuel issue, but anything is possible.

 

Have you replaced the rail pressure sensor yet?

[2500ctd]

Not yet. Had to rebuild the forks on bike. Easier then the truck now. I pulled the tank and drained it. So hopefully no fuel issue. Which of course after I drain the tank.

Easiest way to go about testing the sensor? I'll have to back probe the harness. Least intrusive is a sewing needle. Worked for me before. 

[AH64ID]

No real good way to test it, tapping the line will not do anything. If you have replaced the FCA and are still having funky RP issue I would just swap it. 

[2500ctd]

Local Cummins $230.  

Reading the thread a few down. 'Truck died on highway…'. Might also maybe pick up a cov.  

[2500ctd]

Can someone double check me. I found the pressure relief valve for $265, the pressure sensor for $217 and a fuel rail for $299 which includes the relief valve and the pressure sensor. It would be cheaper to buy the rail and take the sensors off the new rail. I am reading that right, right?

http://hoeslidiesel.com/store/page13.html

 

I was going to stop the local Cummins and have them order a pressure sensor, Might be getting a whole rail now instead.

 

Edited February 29, 2016 by 2500ctd

[Mopar1973Man]

You could change out the entire rail cheaper... 

As for the sample of fuel it looks like you got a load of summer fuel and the last batch was clouding up.

Edited February 29, 2016 by Mopar1973Man

[AH64ID]

Yes I have heard the entire rail is cheaper. 

Just to be sure call Todd at T&C diesel. He may also be able to give you additional troubleshooting advice. 

[2500ctd]

Ordered the rail.  Debating on switching the whole thing out or just pirating what I need off of it. 

Part number is 4929618

Genos lists the rail as well for 299.00. 

Edited February 29, 2016 by 2500ctd

[2500ctd]

What pressure does the relief lift at? I thought I saw it here but cant find it now. My relief valve with the as shown 26112 psi isn't leaking

 

oops found it well top post on this page. I missed the post about calling T&C diesel 

Edited February 29, 2016 by 2500ctd

[AH64ID]

I would still call Todd and ask. He is pretty HPCR smart. 

[angus]

On ‎2‎/‎29‎/‎2016 at 11:32 AM, 2500ctd said:

Ordered the rail.  Debating on switching the whole thing out or just pirating what I need off of it. 

Part number is 4929618

Genos lists the rail as well for 299.00. 

Looking at some of the corrosion your seeing, I think I would swap the whole rail out.. Just me.

[2500ctd]

New rail is in. Anyone know the torque specs for the fuel lines? Says refer to torque specs.  Can't find them in the manual. Running out now to get a crows foot for the torque wrench. Didn't have a 19 mm but I had a 3/4 tube wrench. Also what size is the connector tube nut? 21mm ish?

 Rail is surprisingly heavy. Well it is a high pressure vessel.  

[2500ctd]

Couldn't use the crows foot. No room so I used the calibrated elbow. New filter setup is mounted as well. Gonna run the bf7633 since I have it. And my bf1212's showed up today.  So hopefully I can get a ride to get some diesel.  Don't think I want to strap 5 gal diesel can to my back on the bike. 

Pocs of filter setup:

 

[2500ctd]

Nogo. Same as before.  Rail pressure maxes after starting. So its a new rail with pressure valve and pressure sensor. Maybe try another fca? 

At a loss now.  Only code is low voltage to grid heater which I know about that issue.

Edited March 18, 2016 by 2500ctd

[Mopar1973Man]

Above picture shows the ECM voltage at 15.7 volts??? Max of 16.0 Volts??? That excessive voltage might be causing some issues.

[Killer223]

what's RP vs RP-D?

[2500ctd]

The higher voltage might be cause the batteries were a tad weak however the truck always seemsbto charge high.  According to the gage.  I haven't thrown a dvm on it yet.

Top picture shows the actual rp vs rpd. ThAT is something else I don't understand. It is obviously higher then desired yet no codes.  

Edited March 18, 2016 by 2500ctd

[dorkweed]

What does this truck sound like when idling???  With max RP, it should be loud as hell.

[2500ctd]

It does sound like crap.  Same as if the fca was unplugged. 

Checked the battery voltage with it running. 14.99. Within .25v of the smarty display when I actually compared them. 

 

So so it seems to be fixed.  As a last ditch measure, picked up one more fca.  4 total.  ?  At first the pressure has trouble stabilizing.  Was jumping +/- 1000psi at least.  Engaged the high idle let it run and it finally settled down.  At first even revving it would hang.  However seems fixed now. 

 

My idea: the other fca's were ran with the old tank of diesel.  As I posted I dropped the tank cleaned it out and ordered a fuel rail.  The fuel in the tank I used to drain it initially is still very cloudy. Like the pics in the beginning of this thread.  

So wth the new rail and just under 5 gal it started, rail pressure maxed. Then I heard it settle. Watch the smarty as the rail pressure dropped to normal…and continued to drop till it quit.  Hoping 4 gal isn't enough.  Gauge didn't even register. Add 5 more gal.  Started and max pressure but it ran.  6-6.5 psi at the cp3 with my new filter setup.  Got the new fca today and all good. After it 'learned'.  

So I am back to thinking I had a bad tank of diesel that killed the fca.  I more then likely didn't need the rail. Which I will keep the old one. However since one of the banjos showed corrosion, not a bad idea to install clean parts.  Anyone want to test my old fca? I would put it back in to see but I'm paranoid now and it's nice to have it running again.  Boy is it slow.  I got used to riding my bike. Lol.

 

[Killer223]

Glad you got it fixed. i'd test the FCA for you but i don't like turning wrenches unless i have to.

What bike? i sure miss mine.