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8.3 CTA Cummins fuel shutoff solenoid bracket.
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Supporting Member of Barthmobile.com 7/17
Picture of Steve VW
posted
Things may be slow here on the site but for me, never a dull moment. On the way through Knoxville traffic (why don't these things ever happen out in the country?) I lost most of the engine power. Ended up limping to an exit at 35 mph. Made it to a gas station to figure out what was wrong.

Looked in the engine bay... there's your problem! There is a fuel shut off solenoid mounted on the injector pump. It is supposed to open the fuel valve while running and close the valve to shut it down. It was hanging loose and sideways! (Actually I was lucky it didn't drop a little further and shut the fuel off completely)

The mounting bracket had failed. One bolt broken, one ear broken off. The remaining holes were worn out of round. Thanks to my heroes at Cummins, there is a part number stamped into the bottom of the bracket. (3965494 as you can see) Thumbs Up



I removed the solenoid and bracket, tied the valve open with a piece of string and drove on. When I got home I ordered a new bracket on Ebay. 4 days and only $20 later I have the new backet.



I still have to remove the broken bolt from the engine pump. FWIW, this is similar but not the same setup as the 5.9 Cummins. This solenoid is part #3936026 (with 3" bolt spacing). It has a 3 wire electrical plug. (The 5.9 solenoid has 2.5" bolt spacing.) Mechanic

It is up to 37 today but I may wait a while to reinstall. I may use a small bungee cord to hold the valve open until I get back to warm climes. Then I will also show pics of where it belongs on the engine. Mechanic

Have Barth, will travel Tooling Along


8607-3346-33TFPOB------9708-M0037-37MM-01
86 Regal SE 33 Tag axle--"98" Monarch 37
Chev P3(7) 454TBI--------Cummins 8.3 300 hp
400 hp fuel injected-------6 spd Allison, Spartan MM
 
Posts: 3313 | Location: Kalkaska, MI | Member Since: 02-04-2011Reply With QuoteReport This Post
Picture of L78steve
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I had a problem with the solenoid today.
Turned the key to start and when I released the key the engine died.
Repeated about 6 times and it finally held and didn't fail again.
These things have one circuit to pull in and another circuit to hold in.
That's why 3 wires.
I'll be carrying a bungee cord myself for a while.




1993 34 Regency WB
8.3 Cummins 300HP
 
Posts: 153 | Location: Hendersonville NC | Member Since: 02-02-2016Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 7/17
Picture of Steve VW
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On my Spartan, the pick winding runs from the starter and the hold winding is tied to one of the switched circuit breakers on the rear power panel. Check those connections.

Since it is on the switched power buss, you may have a similar relay problem to mine. The pick winding is powered by the starting circuit. The hold winding is powered through the rear master relay... hmm



You can see at the top there are 2 sets of breakers.

Immediate left is the master switch. Just to the right of that, terminals sticking up, is the rear master relay.


8607-3346-33TFPOB------9708-M0037-37MM-01
86 Regal SE 33 Tag axle--"98" Monarch 37
Chev P3(7) 454TBI--------Cummins 8.3 300 hp
400 hp fuel injected-------6 spd Allison, Spartan MM
 
Posts: 3313 | Location: Kalkaska, MI | Member Since: 02-04-2011Reply With QuoteReport This Post
Picture of L78steve
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Thanks for the tip. Heading South first thing in the AM. If it acts up again I'll get out the test light and check that circuit.




1993 34 Regency WB
8.3 Cummins 300HP
 
Posts: 153 | Location: Hendersonville NC | Member Since: 02-02-2016Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 10/08
Picture of MWrench
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I had a similar problem months ago, engine would start but would stop when the key returned to run position.

Problem was a sticking solenoid, the pull in winding had enough power to move the fuel control just enough to start but not far enough for the run winding to hold in.

I turned the key on to the run position and then went back and manually pulled up the solenoid. It did stay and then I went back to the front and started the engine.

When I got back home, I cleaned the solenoid area and lubricated all the levers, no problem since.


Ed
94 30' Breakaway #3864
30-BS-6B side entry
230 Cummins, Allison 6 speed
Spartan chassis
K9DVC
 
Posts: 1909 | Location: Los Gatos, CA | Member Since: 12-08-2005Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 7/17
Picture of Steve VW
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Notice the labels (upside down) on the 4 breakers on the far right (switched) buss.
Far right: air dryer
next: FUEL SOLENOID
then: Back up/low coolant
then: ignition reg (to the alternator)

Check for power at that fuel solenoid breaker terminal when key is on. It should be wired straight from there to the hold winding of the solenoid.


8607-3346-33TFPOB------9708-M0037-37MM-01
86 Regal SE 33 Tag axle--"98" Monarch 37
Chev P3(7) 454TBI--------Cummins 8.3 300 hp
400 hp fuel injected-------6 spd Allison, Spartan MM
 
Posts: 3313 | Location: Kalkaska, MI | Member Since: 02-04-2011Reply With QuoteReport This Post
Picture of L78steve
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quote:
Originally posted by Steve VW:
Notice the labels (upside down) on the 4 breakers on the far right (switched) buss.
Far right: air dryer
next: FUEL SOLENOID
then: Back up/low coolant
then: ignition reg (to the alternator)

check for power at that fuel solenoid breaker terminal when key is on.


I see that in your picture. Looks like #35. I have the same panel.
I'll try the lube job also. Thanks.

All the way from Alaska with no problems. A good thing to.
Not much help up in those parts.




1993 34 Regency WB
8.3 Cummins 300HP
 
Posts: 153 | Location: Hendersonville NC | Member Since: 02-02-2016Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 7/17
Picture of Steve VW
posted Hide Post
good luck Thumbs Up Mechanic


8607-3346-33TFPOB------9708-M0037-37MM-01
86 Regal SE 33 Tag axle--"98" Monarch 37
Chev P3(7) 454TBI--------Cummins 8.3 300 hp
400 hp fuel injected-------6 spd Allison, Spartan MM
 
Posts: 3313 | Location: Kalkaska, MI | Member Since: 02-04-2011Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 9/17
Picture of MichaelR
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After help from some of our experienced members, I was able to trouble-shoot the symptoms, and discovered the "hold" coil of the fuel shutoff solenoid was inop.
P/N 3919422 fuel shutoff solenoid purchased off Ebay ($32).
Was somewhat skeptical as with most everything the solenoid is manufactured in China. Upon delivery, I compared it to the solenoid that had failed (looked to be an original from Cummins). I was impressed, so I ordered another to carry as a spare.
8K miles later, the solenoid is still doing the job. Is good to have the zip-ties on hand as they can be used for a variety of applications, but for the price and proven longevity, carry an extra solenoid. Is easy to replace(the most difficult part of the job is moving the mattress off the engine access box).


1994 Breakaway XL
33'
6CTA 8.3
Banks
Allison 5 speed
Gillig
9310-3888-33XHG-7C
 
Posts: 161 | Location: Parked at a family members house for the time being in Greeneville TN | Member Since: 05-11-2012Reply With QuoteReport This Post
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