After reading Midewestdually's post yesterday and it turned out to be his KSB, I thought I would try something on mine this morning. I unplugged the KSB and started it. To my surprise there was no difference in how it started. So that made me start thinking it has never worked. So while I had the wire pulled off, I lifted up the harness a little bit and I saw another connector not hooked to anything coming out of the same harness. My question is, where does this other one go? I looked for 10 minutes, felt around with my hand, and still could not find anyplace it might go. Could someone please give me some insight as to where this might go. I am thinking my KSB is either bad or not hooked up properly and has never been working. Although I have no problem starting my truck without it plugged in down to -5 below so far this year. Thanks, Bill

 

The KSB circuit is pretty simple to trace. The blue wire from the KSB goes into the harness and to one pin on the KSB sensor ( the rear most sensor) in the intake manifold. Then from there it goes up to the fuel shutdown solenoid. Basically the KSB is only live when the power to the Shutdown solenoid is on. When the temp is below the sensor setting (I'm not sure that value :-[ ) The KSB sensor (really a switch) closes and powers the KSB. <br><br>You can check the KSB switch if you swing it out and put it in a glass of icewater. It should click, then hold it over a heat source and it should click again, closed and open.<br><br>I think alot of midwestdually's problem is that his timing is retarded and he needs the KSB to start more so than you would with good timing.<br><br>J-eh

 

Well now that you mention the fuel solenoid. I saw in Bushy/Bushwackr's post yesterday that the fuel solenoid has 2 wires on it. Mine only has one wire on it. I had the guy we bought the truck from replace it. That was part of the deal, he took the string off the pump and replaced the fuel solenoid. He said he bought it from Cummins, so I assumed it was the right one. Perhaps it is one that just works off one wire instead of two. I wonder since the other wire is not hooked up, it would cause the KSB not to work properly? <br><br>It starts and runs ok, so should I worry about getting the right solenoid. Or just leave it be and run it like it is. It won't hurt the pump not to have the KSB work will it?<br><br>

 

The fuel solenoid has a double spade connector on it. One wire feeds what I call &quot;trigger voltage&quot; to open the solenoid, and the other wire supply's &quot;maintainence voltage&quot; to hold it open once the truck starts. Both go thru the same contact on the solenoid. I think the trigger voltage is 12v, and the maintainence voltage is 10v but that needs to be confirmed.<br><br>As for the KSB, you won't hurt your pump if it's not connected or used, but you will have harsher starts, more smoke, and rougher idle without it.<br>What happens with the KSB function is this.. the solenoid increases the internal pump pressure from about 4bar to 8 bar, pretty much doubling it.<br>That increase serves to increase pump timing advance. That increased advance smooths out the idle, reduces the smoke etc.etc.... it is only on a relatively short time, depending on temps of course, but it is a help on initial startup. You are likely to have more raw fuel, maybe even some washdown on the cylinder walls, depending on your injectors, without it. You will certainly have a little more soot deposits on the injector tips, that is until you warm it up and drive it hard to clean them up.<br><br>Bob.

 

I will take a couple pics and let you see what I am talking about. There is no double post on the fuel solenoid. Bill

 

[quote author=Bushy link=board=9;threadid=11473;start=0#109018 date=1046208513]<br>The fuel solenoid has a double spade connector on it. One wire feeds what I call &quot;trigger voltage&quot; to open the solenoid, and the other wire supply's &quot;maintainence voltage&quot; to hold it open once the truck starts. Both go thru the same contact on the solenoid. I think the trigger voltage is 12v, and the maintainence voltage is 10v but that needs to be confirmed.<br><br>As for the KSB, you won't hurt your pump if it's not connected or used, but you will have harsher starts, more smoke, and rougher idle without it.<br>What happens with the KSB function is this.. the solenoid increases the internal pump pressure from about 4bar to 8 bar, pretty much doubling it.<br>That increase serves to increase pump timing advance. That increased advance smooths out the idle, reduces the smoke etc.etc.... it is only on a relatively short time, depending on temps of course, but it is a help on initial startup. You are likely to have more raw fuel, maybe even some washdown on the cylinder walls, depending on your injectors, without it. You will certainly have a little more soot deposits on the injector tips, that is until you warm it up and drive it hard to clean them up.<br><br>Bob.<br>[/quote]<br><br>Ok Bob, here are the pics. You can see the one that is not hooked to anything to the right of the KSB coming out of the same wire harness. Answer me this though. Why will the fuel solenoid stay open if it don't have a maintained voltage? Or is the one hooked up the constant voltage line and it has enough to make it open and shut when the key is turned on? Bill<br><br><br><br><br><br>

 

The blue wire that goes to the fuel solenoid comes directly from pin #9 on the PCM and the ignition switch and powers the fuel solenoid. From there there is the jumper wire that goes to the KSB circuit.

Your picture shows a spade connector just laying there. That is the KSB feed wire . It needs to be spliced into the wire on the fuel solenoid.

I have had the whole harness out for the KSB, its totally separate from the others. Follow the wires from the KSB sensor back to the pump just to be sure..

J-eh

 

Yes, I'm certain Lil' Dog is right on that..
My fuel solenoid has a blue and a black attached. It may be that the original dual spade connector on the fuel solenoid got dropped or lost and that's what got put on in its place.

There is something else here too... I'm certain (just not which years) some KSB's ran on a 10 volt signal not 12v.
They had some sort of wax interior, and could be damaged by over supplying with 12v.
Maybe someone else could confirm this for us...

Last, it kinda looks like your breakover spring needs adjusting a bit too. On your last of three pictures, it is on the far left side, in the upper part, and looks like the radius end of a hair pin, with a small metal post between the ends of the hair pin.
The firewall end of the spring (hairpin) should be touching the metal center post when the throttle is at rest. That's how it looks to me ...
The way to adjust that is to slightly lengthen the throttle linkage until the pin is up against the spring end.

Bob.

 

lil dog is right. There is supossed to be two male spades on the fuel selonoid. One is power from ign. for eng. to run. The other(where your loose wire should be) is power supply up to a temp. switch in the intake. It then goes back down to the ksb. The wires from selonoid to switch to ksb are in one little bundle by by themselves(I've had mine off as well). <br> It appears as if someone has put the wrong fuel selonoid on your pump. If you still have the old one you might be able to swap the spade connectors. A friend of mine (a cummins tech) told me the ksb and the intake heater were added mainly for emissions. When I first got mine going the heater &amp; ksb didn't work and had now problems starting on 20% morns.

 

Ok how do you adjust that and what does it affect? <br><br>As for the KSB, I just remembered my neighbor has a 92' as well. So I am going over there first thing in the morning and look and see how his is hooked up. If that loose spade is supposed to go on the solenoid, I will just cut the connector off and use a splice and put it ont the blue wire running to the solenoid. <br><br>Bill

 

Bushy you are fast. Just can't let anybody else get the jump can you?

 

[quote author=ZUNK link=board=9;threadid=11473;start=0#109187 date=1046234868]<br>lil dog is right. There is supossed to be two male spades on the fuel selonoid. One is power from ign. for eng. to run. The other(where your loose wire should be) is power supply up to a temp. switch in the intake. It then goes back down to the ksb. The wires from selonoid to switch to ksb are in one little bundle by by themselves(I've had mine off as well). <br> It appears as if someone has put the wrong fuel selonoid on your pump. If you still have the old one you might be able to swap the spade connectors. A friend of mine (a cummins tech) told me the ksb and the intake heater were added mainly for emissions. When I first got mine going the heater &amp; ksb didn't work and had now problems starting on 20% morns.<br>[/quote]<br><br>Well I went out and looked at my wire tonight and saw that it ran back up the harness. so that tells me what you just said is 100% correct. I am not even going to go look at my neigbors in the morning now. I am just going to splice that wire into the blue solenoid wire before I start it in the morning. I want to see how much of a difference it makes in the idel. My luck the KSB won't even work, like everything else on the truck when I bought it. And if it don't work it can just stay broke. I have never had this not start. When my computer was out and had no heaters it started at 5* one morning without being plugged in. Since I have that fixed it has started at-5* without being plugged in, with no problems. It will be nice if it works though. ;D<br><br>Bill

 

Is there anyway to test the KSB for operation. I put a jumper wire from the positive side of my battery down to the ksb and i didn't here any clicking? My truck is smoking really hard with a raw fuel smell to it. It's also knocking.

 

Sounds more like a bad injector, Luther.

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Mine has been disconnected for years. Haven't found a use for it.