3bii injection pump and bleeding question

This site may earn a commission from merchant affiliate
links, including eBay, Amazon, Skimlinks, and others.

Joined
Jan 23, 2012
Threads
115
Messages
1,049
Location
Everett, Wa
I am in the process of replacing all my fuel lines on my 1990 BJ73 with a 3Bii. The one from the Injectors returning to the IP was cracked (and there was another that was replaced by a PO with radiator hose line). I cannot find a part number for that hose. Looks to be a 5.5mm hose, but has English writing on it, unlike all my other hoses so I am not sure its stuck. I have some 6.3mm hose I can use and seems to seal, but I wanted to check here if someone knew the correct size.

Now for bleeding the 3Bii, there is no visible hand primer on the IP like the 3b. I can snap some photos in the morning when its light, but I cannot figure out where it is. There is a primer on the fuel filter housing (see photo). Do I just use that?

3122638-1580840047-182897.jpg


IP for the 3bii:
Untitled1.jpg


Fuel line:
Untitled2.jpg
Untitled3.jpg
 
Last edited:
Yep, thats a rotary pump. Wouldn't worry too much about fuel line, if it works it works.

Yes, the pump on the the filter housing is your ticket to priming this type of fuel system. Pump until it stiffens up, most likely won't go rock hard however you'll feel the difference. I'd bet this system will return fuel to the tank once the feed side lines are full, if you listen very carefully you *may* be able to hear fuel returning to the tank as you pump.

So, once its time to hit the key, I'd recommend doing so with the hood open, once the engine catches, it may only run for a few seconds and sound like it wants to quit, but you can quickly get back under the hood and keep pumping to help things along until fuel system sorts itself out again. May take a couple tries but if youre quick can usually get it the first go.
 
Very similar priming process when its time to change your fuel filter. If you don't know how old it is, it's time... I like to do them yearly but could be a bit of overkill depending on mileage. Never know what kind of junk or even water is accumulating in there if you don't change it tho. Prevention beats cure, especially for less common vehicles such as this.
 
Thanks! Do you crack the injectors as well like I've read about for the 2h and 3b, or will the air be pushed back with the fuel in the return line?
 
If injector lines are still full of fuel and haven't gotten any air pushed their way from pump side "shouldn't" need to crack injectors. I'd try it as is first, if you don't get any action fairly quickly after the above procedure, cracking injectors would be your next step.
 

Users who are viewing this thread

Back
Top Bottom