Good Morning!

I bought my truck 15 months ago. 1994 F-150 4x4 with the wonderful I-6 and the horrible E40D transmission.

First month, I had to replace the pump and torque converter in the transmission. That was OK, as I was suspecting issues with the tranny anyway. It's fixed and running fine.

The fuel pumps: The front tank gauge sender does not work. Rear tank, gauge works, but the pump is getting very noisy at times. I'm currently running the back tank, trying to get all the gas out before the pump dies. I've been looking at pump and gauge sender combinations, and many look totally different. Without pulling my tanks, I have no idea what the pumps look like in my truck. Also, they are horribly expensive. I have a Mercedes Benz, and the fuel pump for it cost more than half of what these things run, and the OEM pump lasted 400 thousand miles before it failed.

I've got plastic gas tanks. Should I bite the bullet and pull the bed off the truck?

Here's an idea I had: Go to the Ford dealer with my VIN number, and see what Ford part number I should be looking for. What do you think?

I really miss the days of a nice mechanical fuel pump on the engine block. Why would they think a pair of pumps is a better idea than a single OUTBOARD pump ahead of the tanks on the frame at the filter assembly? Awful Idea, imho.

This problem will put me out of driving the truck for awhile. I'm not happy right now. This expense is going to be hard to absorb.

I'm not enjoying driving this truck right now. The roar from the back tank is so irritating.

Truck has 152K on it now.

Thanks for reading my rant. Have a good day.

 

Go here and put your VIN into the search engine:Official Ford Parts Site | Buy Motorcraft & OEM Ford Parts Online | FordParts.com

You would think Ford's official parts website would display the correct pump assemblies...

 

Plastic Tanks? Haven't seen any OEM plastic tanks before. You sure they're OEM Pumps?
I hear these are some good pumps, and the price isn't bad at all.
HFP 255LPH Fuel Pump Assembly *Rear Tank* Ford F150 1990 - 1996

Maybe someone here has actually bought them and give us an answer.

 

Once you have the OEM number, you can go to Rockauto.com and price a high-quality part.


There may be a Bosch pump.


Do rear tank first as you mentioned that was the circuit that registered on the gauge.


Tank must be cleaned out, perfect.


Only way to do that is to pull the tank.


Don't run fuel tanks with electric fuel pumps below 1/4 to 1/8th tank.

 

You don't need to pull the box to replace the pump… my avatar shows my F350 getting the pump/sending unit being replaced with the box on. You can remove the straps and pull the tank down far enough to pull the pump assembly out of the tank. Mine deal took a little over an hour to do.

You can buy a pump without the expensive sending unit… most are under $50.00. My local parts stores have 'em in stock. They simply clamp to the fuel lines on the sender/pump assembly.

Your truck actually has three pumps… one low pressure pump in each tank and a high pressure pump that's needed to make the FI work. Common deal in most modern cars and trucks.

I've never had to clean a tank when replacing a pump…

 

The OP's truck is a 1994 model year. It has a high pressure pump in each tank. No external pump...

An excellent fuel system diagram of the 1990 and later F series trucks w/gas engines:



courtesy of subford

 

'94 truck would utilize only one pump. That would just be the in tank pump and if dual tanks, then just single pump in each tank. No high psi fuel pump on the rail or low psi fuel in tank.

 

I've now got the OEM part numbers for both the front and back tanks. Tech at Ford parts department said this is what is called for via my VIN number:

Front Pump: F6TZ 9A407 AA
Front Sender: FoTZ 9A299 AA

__________________________

Back Pump F6TZ 9A407 CC
Back Sender FoTZ 9A299 CB

Only 2 pumps on this truck.

This is my 3rd F-150 truck since 1982. The first two ran over 350K with no major issues, and were running just fine when they were sold.

This truck has a total of 155K on it, and is nickle and diming me to death.

 

I stand corrected… thanks.

 

That is what this forum is all about..learning from each other!

 

Now I got to raise the money to replace the pumps and the gauge senders! I sure don't want this job to come back again.