Did a search but did not find the answer
Working on my 1992
Just installed rebuilt injectors and injection pump From Oregon Fuel Injection - reasonable price and good service
Have 12 V to FSS
Traced the wire to KSB, The inline resistor measures 4 ohms, then to block temp sensor - then to KSB
The voltage to the KSB is 5 V
Has anyone measured the voltage to the KSB?
Is 5 volts correct? Or what voltage activates the KSB?
Cheers

 

I've heard 10 volts. 3 ohms for the resistor.
1. Yours is low for some reason, and lower than that slight difference in resistor would make it, so either there's a short in the KSB, or the supply voltage isn't right.

2. It doesn't matter anyway. KSB shouldn't prevent starting. It only slightly advances timing for warm up.

Watched one of the Propane group guys get the engine going on a bobtail that had fuel tank done and had gotten air in the fuel lines. It was a 5.9 cummins.

He bled a few injectors, then sprayed a small amount of gasoline into the air intake as it was cranking. Took right off.

I don't think that rig had air intake heaters in it, but it should work as long as you disconnect the heaters. If you don't disconnect the heaters, wear your bomb squad gear.

 

Thanks j-martin
Have you ever measured the voltage at the KSB?
Since the pump is rebuilt (by a reputable company) I think the KSB is okay.
When I searched I couldn't find someone that had measured the voltage.
Anyone?
Thanks

 

If yours is the early (heat motor) KSB that driven through a ballast resistor, it will be somewhat less than 12V. If it is the later solenoid KSB, then it gets a full 12 Volts from the thermal switch in the head.

The KSB isn't keeping it from starting. Yer barking up the wrong tree.

 

Thanks again j-martin
The truck starts but with a lot of white smoke - so most of the posts point to the KSB.
Truck is 92. Don't know which type of KSB is in truck
But the in line resistor will lower the voltage to the KSB - I just can't seem to find a value.
Wiring diagram doesn't help because I don't know the current
Cheers

 

White smoke could be from grid heater failure or air in the fuel.

 

Thanks rattlerbob
I'll check the grid heaters
(I ordered a manual from Geno's)
So following j-martins post, I'll use 3 ohms and 10V,
I'll replace the resistor - a higher R value would lower the voltage
And I'll replace the temp sensor - I take it out to get the part number
Cheers

 

There's your problem in part.
The heat motor version has no temp sensor. A time delay is accomplished by the heat (wax) motor.

The solenoid version has a temp sensor that shuts off power when it heats up.

Never the twain shall meet.