What does this vacuum bulb and lines go too ?

[candymancan]

Sorry if i seem ignorant. But im trying to get this 360 running properly on my J10. It start immediatly but dies immediatly. Gas tank oddly eveb though the bed is gone.. the tank is ok outside.. but the filler tube is gone. Probly would explain why gas splashed on the uhaul trailer lol.

For now ima bypass the tank and use a 5 gallon gas tank. The question i have is this. The prior owner... i mean he didnt route these vacuum lines properly.

Did the 76 even come with a charcial canister ? I dont have one.

The pcv valve in the back.. jiat pulls outa the intake flopping around.. on my 90 the valve back there screws into the intake with a 90 degree metal tube.. and the rubber line goes into it. On this 76 it seems like the pcv valve goes direcfly into the intake ? But mine flops around.. im not sure how to get this mounted back on.. its odd. What did the 76s pcv look likw back there ? Anyone have a pic ?

Also the ditributor vacuum line.. he has routed DIRECTLY to the left side of the carb. Where the choke is. On my 90.. the distributor line goes into the cto on the thermostat housing.. then a line goes from that cto to the left of the carb.. i assume he has this routed wrong.. and it should be like my 90.

The other vacuum lines are all messed up too.. I think ima just use my 90 as a refference.. as i routed ny 90 based off 70s wagoneer diagrans i found.

Behind the carb on the firewall is a big vacuum ball.. on my 90 it routes to the cto in the back with like 6 diff nipples all routing to the charcoal canister and what not.

On this 76.. there is only a 2 nipple vacuum thingy on the intake.. Its deff diff than my 90.

On the 76 there are also small metal tubes that are open near the trans dipstick.. going down the back of the engine somewhere... what do these go too ?

Sorry i just gatta get this figured out.. It seems it has so many vacuum routes wrong.. or vacuum leaka.. and exhaust leaks.. ima delete these injection tubes on the manifold as well.. meaning break em off and weld em shut.

The oil smells of gasoline too.. and seems like it thin. And a quart overfilled.. So that has to be drained and refilled.

I suspect whwn he got this engine running.. he dumped too much gasoline in the carbs bowel and intake directly.. it only ran for like 20 seconds.. so i doubt any dmg to the beaeings occured.. but i did notice oil pressure was 0 whwn it was once 50+.

Ill worry about that later though once i drain refill and get these vacuum line right. And have it running off a a fuel can.. versus the tank.. while i drop the tank and clean it anyway.

[tgreese]

Check the 1976 TSM. Free to read and download on the Tom Collins site.

There is a table in section 4A. Pretty sure the 49 states truck does not have a catalytic convertor or the FTVC.

There should be a grommet for the intake manifold that the PCV plugs into.

Suggest you change the oil and filter. Diluted with gas is bad. Delo or Rotella 15W40 is good.

Forget the vacuum plumbing on the '90. Totally different. The '76 is way simpler. Read the TSM - way more there than I can type out.

[candymancan]

Ima just put what i got which is 5-40 or 10-30 i have 5 quarts of either. No sense in buying more.

Ya i noticed it only has a few vacuum lines.. but my 90 doesnt have many either after i deleted them all and routed it like a 70s wag..

Ya the lcv looked like it has a rubber gromment i guess its rotted mostly. I wonder if they still sell them. Or ill have to silicone it on lol.

Ya this exhaust is new.. someone did duel pipe. Routed out the sides of the front of the bed.. not sure i like the pipe right NEXT to the gas tank though.. id probly put some kinda sheild there.

No cats.. Looks like magnaflow glass pack mufflers.

[candymancan]

Ok i read 4a.. seems i didnt have a cat.. thats good saves me money... it mentions a charcoal canister.. but only shows pics of the 4.2l.. nothing on the v8.. so i have no idea where this canister would go


It also didnt include pics of full vacuum routings.. just pics of a few vacuum routes and thats it..

The tsm wasnt very helpfull tbh.. it didnt explain the vacuum ball in the back either.. or these 3 tubes here. I dont care about emission crap or nox fumes... I just want it routed to work simplest lol this thing isnt ever gonna need to be inspected.. ever.

This carb looks very diff from my 2150.. i assume its a 2100..

[tgreese]

Look at the table at the end of the chapter. No cat or FTVC on a 49 states truck. Please read the TSM.

No vacuum diagram for 'a 76. Vacuum plumbing is shown at the section about each device. Do not assume emissions are like your '90. Much simpler.

Quadratrac locked 4WD vs full time is controlled by vacuum. This is in the TSM. Please read the fine manual. You could also read the Jubilee Jeeps Quadratrac page. Some homework required. https://www.jubileejeeps.org/quadratrac/index.htm

The '76 book also expects more competence from the reader and will not have the detail of the '90 book. Nothing a dealership mechanic or service manager would know in 1976 is included.

[Stuka]

The vacuum bulb is just a vacuum reservoir. So when the engine is in a low vacuum condition, things that are vacuum operated (like the Quadra-Trac, heater/defrost flapper, various vacuum operated engine bits) continue to work.

The carb is a Motorcraft 2100. That one is a rebuilt replacement most likely going off the sticker.

[will e]

The gas smell in the oil worries me. CHange the fuel pump. Cheap to do. It might be leaking.

[candymancan]

I think the gas in the oil was from the guy pouring a 500ml bottle if fuel into the carb bowel and flap... lol i have a spare pump though it should bolt to this. Unless the years vary.

I am reading the tsm tgrease lol thanks. I found out 76 didnt have a cat and i learned some from it.. but i couldnt find a full vacuum diagram.

Also what about the bowel vent on top of the carb ? I cant find anything in the tsm mentioning it. This carb also has no nipples for it either.. its just drilled and open. I know earlier years didnt vent to the charcoal canister.. but later years did.

Is it ok if these ports are jist open like this ?

[tgreese]

Is the port you circle open? Do you have the TAC (thermostatic air cleaner) that closes to the outside when you shut off? Only used with that.

Make sure what you circled actually goes into the float bowl, and is not a blind hole. When in use, there should be a tube pressed into the cover to accept a rubber hose.

The bowl vents on the air horn also go into the float bowl. These are open to the air cleaner. Without the TAC, they are always open to the outside through the air cleaner element. This makes a vent on top of the float bowl pointless.

This is a rebuilt carb, as Stuka pointed out and as evidenced by the sticker on the side. Realize that the rebuilders stock these things to cover as many applications as possible, and the compatibility is ... loose at best. Has a broken choke arm too - see the wire wrapped around the plastic part?

I hear the import repop 2100s and 2150s are pretty good. Does not have to be a 2100; a 2150 will work fine.

This link is not an endorsement; just an example:
https://www.amazon.com/Mophorn-Carburet ... B07JZHLFXF

[candymancan]

Ya i noticed the wire on the choke.. i am wondering if this is why it dies when it starts immediatly. Itll run for say 5 seconds. Then die but it could be fuel related too since the tabk is empty.. i havent disconnected the fuel line yet and cranked the engine to verify if its even pumping fuel.

Wondering if i should just buy a new carb with this choke arm wired like it is.

Ill check to see if the hole indeed does through or not.. i did notice on the left of what i circled it isnt drilled so its just a hole in the front.

No this air hat doesnt have those valves that open and close.. Its just open.

That hole i circled.. you sure its for that ? On my 90 it goes to the charcial canister.. that port is called a fuel bowl vent valve. It vents fuel vapors from the bowl to the charcoal canister. Since i have no charcial canister.. i guess itll just vent into the air cleaner lol.

I used to have a 2150 spare.. i shoulda never sold it lol..

[tgreese]

You can sometimes find individual parts like that plastic choke part if you search. The choke has two functions, fast idle and the choke flap. If the choke flap is closed, you should be able to keep it running by holding a high idle. Adjust the curb idle stop to idle faster.

Other vacuum leaks will make it lean and more likely to stall.

The accelerator pump diaphragm on the front of the carb may be perished. Common problem, esp. when it's been sitting. The engine will start but give it the least throttle and it will die. https://www.amazon.com/gp/product/B000C ... asin_title I keep these on hand - my experience is this cheap replacement part only lasts a couple of years.

[candymancan]

Okay thanks ill save that on my amazon page. I gatta bypass this fuel tank. Drain the oil and filter.. and refill and hook the fuel pump up to a 5 gallon can. And redo these vacuum lines and plug the leaka.. ajd see if i can get it running from a cab first. Before i go any further.. if u can get it running like this.. than its probly fine.

I need to drop the tank too.. its onky git a little aurface rust on it.. so its still a good tabk on the outside.. but lets see what the inside looks like lol

[tgreese]

You can skip the whole fuel pump thing for now. The engine will run by siphon from a fuel can on the cowl. BTDT.

Any parts store can get Dorman stuff, same or next day.

[will e]

First job is to get it running.
Plug every vacuum line on the carb and manifold except for the brakes. (You can plug the brakes too but make sure the wheels are chocked.)
Leave the PCV connected.
Everything else can be plugged and you should be able to at least get it to idle like that.

[candymancan]

So does anyone have any idea what the metal lines behind the intake are for ? That go down the back of the engine.. are the for the 1339 quadra trac ? Or are they for the fuel tank vents ?

[tgreese]

I have never owned a Quadratrac truck. Likely - it needs vacuum lock and unlock. Did you read Flint's page? Suggest you get under and see where they go.

[candymancan]

They are for the 1339. There are 3 vacuum lines in a triangle shaoe going into the dash by the intrument cluster and they go to the glive box. Two rubber lines i found hanging nesr those 2 metal lines.. the 3 rubber line is hanging near the drivers exhaust manifold.. im guessing.. this one got vacuum from the engine.

Oddly there is a 4th metal line going down near the pcv. Right next to the 2 open metal lines..

So either this quadra trac.. has 4 vacuum lines.. Or this 3rd metal line goes to the transmission or something lol

[will e]

If it is the GM TH400 there will be a vacuum controlled modulator.

[tgreese]

.. im guessing..

Geezus. Don't guess. Read the frickin' manual.

BW1339hoses.png

From Flint's page, LINKED ABOVE!!!

[will e]

RTFM? I miss that from my old IT days.