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Anything below 158° is considered cold for an indirect injection diesel engine. I agree with your diagnosis of something not letting it glow when the engine is above overnight cold but below normal operating temperature. By the way. Just about every 6.2 glow plug system has trouble with the...

Check the ground on the flasher box plug as well.

It is nice you are trying to figure this out yourself. If you have to pay someone to maintain a 40 year old vehicle it will break you and not be what you want anyway. Make the -20 Technical Manual your friend. It has over 100 pages of trouble shooting and in the appendix the wiring diagrams.

Here is the link: https://www.offroaddesign.com/front-and-rear-spring-bushing-kit.html

Off Road Design might be able to answer your question and maybe have a better option. I put some of their gray bushings with the greaseable bolts in my front suspension. Very firm with no noises.

Most electric pumps like to push fuel. They really don’t suck fuel very well in comparison. Here is a video I did after pretty much your exact same scenario showing how long it takes to reprime the injection pump with a pusher electric pump. Different truck but same engine:

Don’t limit your search to just K5 blazers. Suburban’s and trucks will be the same. The exhaust behind the seats is the only difference. That can be fixed with a saw.

Does the bubbling happen when there is no air in the air system?

A quick search showed several new kits still for sale. I didn’t try to check out though.

No, The octopus was not an engineering masterpiece. At least not when put into production. It combined the CUCV sensor that is screwed into the cylinder head for temperature sensing and the printed circuit board under the dash all into 1 housing exposed to vibration, heat and liquid. At least...

That is the “octopus” controller for the very early civilian 6.2. I know they used them at least as long as 1984.

Threaded holes are in the floor already so seat belts are easy. I used HMMWV ones. I like the idea of self retracting models. A wet muddy strap across your lap is not always good.

NDT figured out the numbers while I was writing.

Are your rear engine mounts held in with rivets or bolts? That is the standard for a Gasser swapped over to a multifuel. If rivets, that is the engine the frame came with. If bolts then it has been swapped over. I think you have a Gasser frame and multifuel body work. The thing about going...

Good news.

I forgot about the partitioned intake. The one of mine that I swapped over has a HMMWV open plenum. Thanks for bringing it up.

The non turbo valve cover mounted CDR just has a single hose that goes to the intake. Exactly like the 6.2 unit. But, just a single hose to one side under the air filter. Not trying to sell you on a bunch of work. If you can get good 6.2 parts. That is the easiest route to go.

When they built the last 6.2, they built the last set of those fittings. So, any you find will be over 30 years old. Keep that in mind when looking. The 6.5 engine got the press into the valve cover CDR. That is a much better set up for us looking to keep an old engine running. You will need a...

I finally had good enough weather and the time to make a video:

The gasser had 4th gear up and right With 5th 1:1 bottom right. The multifuel used the 1:1 gear as 4th and had an overdrive gear in the up and right spot as 5th.