Slow fuel pickup

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Mar 6, 2018 | 08:17 PM

blacklab1

Thread Starter

Tuned

Joined: Aug 2009

Posts: 274

Likes: 4

From: British Columbia

Slow fuel pickup

95 F150, 5 litre Auto, 4x4
My wife was driving the other day and ran the front tank dry before she switched it over.
I filled the front tank now it doesn't pump, and when I start it on the back tank it seems to be slow on the fuel pickup.

Any suggestions appreciated.

Mar 6, 2018 | 09:37 PM

ceetwarrior

Cargo Master

Joined: Jul 2003

Posts: 2,328

Likes: 14

From: Colorado

Change fuel filter first.

Mar 7, 2018 | 07:15 AM

subford

Fleet Owner

Joined: Aug 2005

Posts: 23,667

Likes: 301

From: Easton,Ks

Sounds like the front FDM needs replacing to fix both problems.
It overheated.
The fuel is used for cooling.
If you do not replace the front FDM the front tank will overflow while running on the back FDM.

Mar 7, 2018 | 02:17 PM

blacklab1

Thread Starter

Tuned

Joined: Aug 2009

Posts: 274

Likes: 4

From: British Columbia

Thanks for the info. I just changed the filter last service.
What's a guess as to the cost to replace the fdm?

I usually do my own work, but not enthused about laying in melting snow.

Mar 15, 2018 | 08:02 PM

blacklab1

Thread Starter

Tuned

Joined: Aug 2009

Posts: 274

Likes: 4

From: British Columbia

I thought I could wait till the snow left to replace the front pump.
Now I have the rear tank filling the front tank and the front tank is overflowing.
What's up with this?

Mar 15, 2018 | 08:15 PM

rla2005

Fleet Owner

Joined: Oct 2005

Posts: 20,786

Likes: 1,751

From: Kentucky

Quote:

Originally Posted by blacklab1

I thought I could wait till the snow left to replace the front pump.
Now I have the rear tank filling the front tank and the front tank is overflowing.
What's up with this?

Post #3.....

Mar 16, 2018 | 07:31 AM

blacklab1

Thread Starter

Tuned

Joined: Aug 2009

Posts: 274

Likes: 4

From: British Columbia

OK, I know I have to replace the front pump.
Is there a way to shut off the return line to stop fuel going to the front tank?
This is my winter beater, and spring is still a month away, so I'd like to keep it running till then.
What system do they use on short WB trucks with only a front tank?

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Mar 16, 2018 | 08:30 AM

rla2005

Fleet Owner

Joined: Oct 2005

Posts: 20,786

Likes: 1,751

From: Kentucky

Quote:

Originally Posted by blacklab1

Is there a way to shut off the return line to stop fuel going to the front tank?

There are two valves that shut off flow to the unused tank. One in the return line, the other is the high pressure supply. Best bet would be to remove both lines and plug them. An ancient thread on this topic: https://www.ford-trucks.com/forums/7...uel-lines.html

A diagram from Subford:

Quote:

Originally Posted by blacklab1

What system do they use on short WB trucks with only a front tank?

There is only a supply and return line line. The tank selector switch is replaced with a jumper and the dash panel is not punched out for said switch.