Hey there, I'm working on my buddies '89 Bronco EB 5.8. I'm replacing the tank and just want to make sure I hook up the lines right. The lines cracked and broke as I was taking down the tank ( also was more than a year ago) so I can't just go by the fittings that were on the lines, they broke off and are MIA at this point. Both of the lines are 5/16" even though most places assure me that one is 3/8". I was able to get new fittings on 5/16" lines from Dorman. I have a diagram of a '90 Bronco but it doesn't show the accumulator thing.
Questions: Looking at the accumulator which lines are the inlet and return to the tank? and I'm thinking I should open the reservoir to clean it out, the truck has sat for many years & the fuel in the old tank was like varnish. Any tips on cleaning it and lines? Should I put carb cleaner (acetone) in the fuel tank, open the schrader valve on the fuel rail and pump it through?

 

Cleaning the tank will be futile IMO, better plan on replacing it
The lines should have been different sizes but no matter
Follow the lines from the rail back
The rail defiantly has two sizes of lines, and the big one is the pressure feed and the small one is the return
There is some good info in the 89 PCED about the tank crossover reservoir valve
The 3 pump style broncos with one gas tank use the reservoir to provide adequate fuel for the high pressure pump
I would leave the reservoir alone for now and focus on getting the fuel pumps working
Once that is done, take fuel samples in a couple of spots
I got a feeling, when that varnish starts to dissolve, you will be replacing 3 or more in tank pumps shortly
That means it will be more cost effective to replace the tank now IMO

 

I'm already changing the fuel tank, I asked about cleaning the accumulator and the identification of the fuel lines to the tank from the accumulator. I'm also putting in a new in-tank pump, I forgot to add that

 

What do you mean PCED?

 

Okay I did a search for this PCED, I saw your post with this pic

I see now your referring to a manual of sorts, I think I have similar manual. Mine is the Master Parts Catalog for 1990 light trucks. Since the Bronco in question is an '89 does your PCED have a pic/diagram of the accumulator? Broncos only have one tank so it isn't the same as this selector valve but, if I'm right it is in the same location in the fuel system.

 

You are calling the accumulator what I am calling the reservoir?
Right, the PCED or powertrain control emissions diagnosis manual is a big honkin book
And right, that page is what I was talking about
There are a few more pages of that selector valve / reservoir diagnosis in the manual and there are a few types
I can post them later if you want
So, on identifying what line is what
Your new pump module assembly will have one big line and one small line
Your reservoir matches that, big and small, the big is the pressure feed and the small is the return
All the way to the fuel rail at the intake manifold, and back
Test fire that pump and see the big one squirt
have fun

 

Yes, I've seen it called both things. So I was thinking where I saw that they meant it was the accumulator that had a reservoir in it, but Idk lol. Whatever it is called it is located above a skidplate for the transfercase and it's hard to see. I was just trying to see which line was which because on this truck they're both 5/16" lines. If, for instance, I find out the upper line is the big one I can trace it back to where the tank is and install the big fitting onto the line then attach the 3/8" fitting on the pump. If your PCED has a pic of it, that would be awesome!

TIA Justin

 

Is there a reason why you cannot follow the lines to see which one goes to the rail and the other from the regulator?

 

Both lines go into the accumulator/reservoir and exit out the other side. If one line bypassed it altogether I would do just that

 

I have never seen where both lines are the same inside diameter. They are different sizes so you cannot connect them incorrectly.

 

My understanding is the fuel lines are different sizes as well.

A photo of the Single Function Reservoir:

courtesy of Steve83

more info here: https://www.supermotors.net/registry/media/669585

 

There are 43 pages of fuel delivery diagnosis in the PCED
Not going to post them all, but here are 5 pages that should be a good start for your Bronco

 

 

I take him at his word and think those early broncos might have had the same size lines
Note that 2 line reservoir in the picture
Those illustrators do a real good job
Those lines look the same size in the picture to me
Agreed, if you cannot identify the lines easily, that will make it tough for his situation
I have also never seen any that were the same size, pressure and return

 

Never mind,
On a second look, the picture does show the one line bigger than the other