What TSU?

[Pstyckiewicz]

I think I have an issue with my TSU.
The truck starts right up from a cold start. If you let it run for 10 or so minutes and shut it off and restart the wait light comes on for a second then goes out. I go to turn it on it turns over for a little bit then finally turns on. I’m assuming that there could be an issue with the TSU thinking the engine is warm enough to not need the glow plugs? If I need to replace what is the TSU I need.

 

[Pstyckiewicz]

Also I have noticed some TSU units with same part number but different branding like (KDS) . From my understanding the brand needs to correspond. So a Smart Start box would need a smart start TSU?

 

[springer1981]

I'm not an expert but I believe the TSU with the Yellow band works with Smart Start boxes. There is also a CR-2696A TSU that is also a Yellow band and should work as well.

 

[Retiredwarhorses]

Yellow Band denotes it’s a KDS manufactured TSU, Nartron doesn’t have the Yellow band….IMO, the colored band was for easy identification between a TSU and GPC. KDS got it right, because many many times I find people purchased and installed an old GPC thinking it was a Newer TSU, but you have to carefully read the unit and you will see they are in fact different

 

[Pstyckiewicz]

Temperature Sending Unit TSU PCB CR-2696A fits Humvee M998 Glow Plug Controller | eBay

Federal Military Parts is a distributor of partscompatible with the military Humvee.

www.ebay.com

 

[Pstyckiewicz]

Will that work?

 

[Pstyckiewicz]

KDS Temperature Sending Unit TSU PCB CR-2696A HMMWV M998 Glow Plug Controller | eBay

Find many great new & used options and get the best deals for KDS Temperature Sending Unit TSU PCB CR-2696A HMMWV M998 Glow Plug Controller at the best online prices at eBay! Free shipping for many products!

www.ebay.com

 

[Pstyckiewicz]

Or that one?

 

[Mogman]

There is a sticky on this forum that matches the TSU to the EESS box (EDIT it looks like the sticky is missing info about the newer smart start boxes)
Are you waiting at least 90 seconds from when you put the run switch in stop and then try to re-start it (if you don't do this every time you can burn out your glow plugs)

 

[Pstyckiewicz]

Yes I wait a decent amount of time. Shutting off and turning on. When turning on I turn to the middle wait light comes on for a second then disappears, then I wait a few more seconds to try to start.

 

[Mogman]

I would think after a full 10 min. the combustion chambers would be warm enough not to need the glow plugs.
How does it start when fully warmed up?

 

[Pstyckiewicz]

I haven’t had much chance to run it for extended periods of time. More testing required for that aspect of it.

 

[Mogman]

I haven’t had much chance to run it for extended periods of time. More testing required for that aspect of it.

Then you need to not worry about the glow plugs at this time, there are other things that can cause it to hard start when warmed up, as long as it works normally when cold go ahead and move on the other things until you can run it long enough to get it fully warmed up.
Are you still running the same fuel that came with it?

 

[Pstyckiewicz]

I replaced all the glow plugs already. Still on the same diesel it came with haha. Probably been in there for 7 years. Read another post about draining any water built up in the filter area by opening up valve when at idle. Might try that with some fresh diesel. Any additive to run through it?

 

[Mogman]

By now you should have drained and replaced ALL the fluids and filters especially the fuel filter and fuel.
Also remove the check valves in front of the fuel tank...
This is by far the cheapest insurance you can buy....

Order a new fuel tank drain plug and git rid of the fuel that came with it, if you got that machine from GP it is probably allot older than that and is likely JP

 

[Pstyckiewicz]

Engine oil and filter, transmission oil and filter, front diff oil, most of my time has been putting things back together and figuring out what is missing. Fuel system as aforementioned is next on the list.

 

[86humv]

Temperature Sending Unit TSU PCB CR-2696A fits Humvee M998 Glow Plug Controller | eBay

Federal Military Parts is a distributor of partscompatible with the military Humvee.

www.ebay.com

Chinese junk.

 

[86humv]

KDS Temperature Sending Unit TSU PCB CR-2696A HMMWV M998 Glow Plug Controller | eBay

Find many great new & used options and get the best deals for KDS Temperature Sending Unit TSU PCB CR-2696A HMMWV M998 Glow Plug Controller at the best online prices at eBay! Free shipping for many products!

www.ebay.com

Thats a real one.

 

[Pstyckiewicz]

For the check valve. I would be removing both the supply line and return line ones? Also what would I use to fill the void from which it came?

 

[Mogman]

For the check valve. I would be removing both the supply line and return line ones? Also what would I use to fill the void from which it came?

Yes remove both check valves, replace with a new pieces of good quality fuel hose, IIRC 5/16 for the return line and 3/8" for the fuel supply line.