I have a 1989 F350. It will only run on the rear tank. I think the selector valve is bad. It looks like it has a canister on the bottom. Not what the pic from the part stores look like.....
Can someone help?

 

This information is for a gas engine and not a diesel.

The fuel tank selector valve on the 89 is mechanical. The pressure from the in tank pumps is what switches the selector valve.

There are 4 fuel lines at the back of the selector valve. The two larger diameter lines are the supply. One from each tank. The two smaller lines are the return lines. One for each tank.

Be careful if you mess with the fuel lines. Don't use an incandescent work light. The heat generated by the bulb could ignite the gas. Use a fluorescent work light.

If you remove the two larger lines and place them in a bucket. Turn the ignition on. The selected in tank pump should run for 2 seconds and you should see fuel coming from the larger hose.

One of the in tank pumps is bad or the selector valve is bad.

Here's a pic. of the tank selector valve which is a dealer item and sells for around $72.00

F1uz9b263b Fuel System Service Kit

 

I can hear the pump run when I turn the ignition on. I think it would be a selector valve problem. I do have a gas engine.

 

Are you sure you're hearing the in tank pump run and not the frame rail mounted pump?

Because the valve is switched by the pressure from the in tank pump you need to compare the fuel flow from each pump. Just because you can hear the in tank pump run doesn't mean it's actually pumping the proper volume of fuel. For example the pump could have a clogged sock filter which attaches to the fuel pump pickup.

 

I'll check tomorrow

 

I have also seen the hose bad (center area missing) from the pump to the holding tube so the pump just circulates the gas in the tank and none will leave the tank.

 

It's F1TZ9B263B not F1UZ9B263B.

Marked with: Ford ID number: E7TA-9B263-AB = E7TZ9B263A > > Replaced By FOUZ9B263A

> > Replaced by: F1TZ9B263B

MSRP: $135.00 / FTEpartsguy.com price: $72.90

Info source: 1980/89 Ford Light Truck Parts Catalog

 

Pricing from the FTEpartsguy web-site

f1tz9b263b Reservoir & Valve Assembly = $100.98
f1uz9b263b Kit Fuel System Service Kit = $72.90

So which part number are you saying is correct for the 89?
Also can you post the part number for the 88?

 

Oh scheiss! Somehow, my 63 yr old eyes read a U as a T.

Ed (FTEpartsguy) just contacted me and said HUH??

MY MISTAKE...SORRY....THE CORRECT PART NUMBER IS F1UZ9B263B.

The MSRP & Ed's price are correct.

E7TZ9B263A = replaced by FOUZ9B263A = replaced by F1UZ9B263B

MSRP: $135.00 / FTEpartsguy.com price: $72.90

After that error...I suggest you get the part number for your 88 from Ed.

 

Bill, you just keep doing what you are doing. A great job!

I'll back you up when needed.

Ed

 

I havent had a chance to look for the problem yet. I needed to use my truck, and didnt want to leave it undone.
How does the fuel line disconnect from the selector valve without damage.?

 

Pry the little plastic clips out (off) with a small screw driver and then the hoses will pull right off.
There may gas leakage and I hope the fuel tanks are not full or there will be a lot and may not stop running.

 

@Bill,

Thanks!

I filled half a 5 gal bucket waiting for the gas to quit flowing before re capping the line.

This info makes me feel better.

Thanks!