Rear Fuel Tank

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Rear Fuel Tank

grumpin
I've had a problem getting all the fuel out of the rear tank. One thing I found was the oil pressure switch for the fuel pump had a bad connector. I have not been able to find one yet, so I butt connected the wires together, that affected both tanks.

At first the rear tank seemed to consistently run down to about 2 gallons of fuel remaining, per the fill up which would take around 17 gallons.

On a recent trip I was running on the rear tank and stopped and got gas and went to the restroom. As I drove from the station it died, I tried it again and it died. Tank was full. I watched the odometer and drove ten miles at highway speeds. Switched to the rear tank and drove the rest of the way home around 170-175 miles. The next day I was able to drive it for 20 miles or so and it died, waited a bit and it died.

This morning I switched to the rear tank before I started it, I have not fueled it yet, and was able to drive 5-6 miles and it died, I pulled over and pulled the gas cap and I can hear the pump running. Tried it a couple of more times and it died. Drove home, parked and switched to the rear tank and it sat there happily idling. Pulled the gas cap and listened. Let it run for maybe 15 minutes and it was fine and the pump sounded consistent.

By my estimate I have 1-2 gallons of gas in there.

The only thing I'm seeing different between the two tanks is the pump. I have drove it with the gas cap loose.

Looking for ideas from this knowledge laden forum!

Dane
1986 F250HD SC XLT Lariat 4x4 460 C6-Sold
1992 Bronco XLT 4x4 351W E4OD
1998 GMC Sierra SLE K1500 350 4L60E
Arizona
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Re: Rear Fuel Tank

85lebaront2
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It could be several items. The "sock" on the pump may be bad. the hose from the pump to the hanger could be leaking. How old is the pump? OEM or replacement? I went through a royal PITA when I had to replace the front one on Darth. All except Pep Boys wanted to sell me an EFI pump, they had Borg-Warner pumps and it was the exact match (this was in 1994). Other question, is the 6 port motor driven valve going completely to the rear tank and powering the pump reliably?

On the switch. Chrysler used a switch for the electric chokes on the 2.2L carbureted engines that has two 1/4" flat terminals, same as their A/C low pressure switch. One of those, and I think I have several spare molded plugs for the A/C switches.
Bill AKA "LOBO" Profile

"Getting old is inevitable, growing up is optional" Darth Vader 1986 F350 460 converted to MAF/SEFI, E4OD 12X3 1/2 rear brakes, traction loc 3:55 gear, 160 amp 3G alternator Wife's 2011 Flex Limited Daily Driver 2009 Flex Limited with factory tow package Project car 1986 Chrysler LeBaron convertible 2.2L Turbo II, modified A413

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Re: Rear Fuel Tank

grumpin
85lebaront2,  I have thought the sock or lines in the sending/pump unit could be the culprit.

Also the 6 port valve, I guess I thought since it defers to the rear tank that that "should" be OK.

The way I understand they usually fail is feeding the opposite tank you are on.  

I don't know if the pump is OEM or not. Same pump since I got the truck a couple of years ago is all I know.

Thought I would check before I get the tank pulled. I decided I'm not going to do it in my gravel driveway!

If you want to part with one of those molded plugs I would be interested in one.

Thanks for the info.!
Dane
1986 F250HD SC XLT Lariat 4x4 460 C6-Sold
1992 Bronco XLT 4x4 351W E4OD
1998 GMC Sierra SLE K1500 350 4L60E
Arizona
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Re: Rear Fuel Tank

85lebaront2
Administrator
On the 1986 system, the 6 port valve does not have a "default" position, it stays where it was set until it receives power through the tank selector switch. I may even still have the switch from Darth since he is now MAF/SEFI and is using the 1990 pump system and 1996 gauges.
Bill AKA "LOBO" Profile

"Getting old is inevitable, growing up is optional" Darth Vader 1986 F350 460 converted to MAF/SEFI, E4OD 12X3 1/2 rear brakes, traction loc 3:55 gear, 160 amp 3G alternator Wife's 2011 Flex Limited Daily Driver 2009 Flex Limited with factory tow package Project car 1986 Chrysler LeBaron convertible 2.2L Turbo II, modified A413

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Re: Rear Fuel Tank

grumpin
85lebaront2 wrote
On the 1986 system, the 6 port valve does not have a "default" position, it stays where it was set until it receives power through the tank selector switch. I may even still have the switch from Darth since he is now MAF/SEFI and is using the 1990 pump system and 1996 gauges.
Oh OK, I assumed it had to be powered out of the rear position. Good to know.
Dane
1986 F250HD SC XLT Lariat 4x4 460 C6-Sold
1992 Bronco XLT 4x4 351W E4OD
1998 GMC Sierra SLE K1500 350 4L60E
Arizona
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Re: Rear Fuel Tank

grumpin
I finally got the pump to fail. It is loud too. I can hear it from the drivers seat with the door open and the fuel cap off and the engine running.

The front one I can barely hear with the cap off and my ear next to the filler with the engine running.

Going to a shop next Tuesday, quoted me $265 for parts and labor.

Also 85lebaron, on the connector, I don't think a 1/4 inch type connector will work, unless I misunderstood you.

Here is a picture of the connector.

Dane
1986 F250HD SC XLT Lariat 4x4 460 C6-Sold
1992 Bronco XLT 4x4 351W E4OD
1998 GMC Sierra SLE K1500 350 4L60E
Arizona
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Re: Rear Fuel Tank

85lebaront2
Administrator
I was talking about using the Chrysler switch if your switch was bad.
Bill AKA "LOBO" Profile

"Getting old is inevitable, growing up is optional" Darth Vader 1986 F350 460 converted to MAF/SEFI, E4OD 12X3 1/2 rear brakes, traction loc 3:55 gear, 160 amp 3G alternator Wife's 2011 Flex Limited Daily Driver 2009 Flex Limited with factory tow package Project car 1986 Chrysler LeBaron convertible 2.2L Turbo II, modified A413

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Re: Rear Fuel Tank

grumpin
85lebaront2 wrote
I was talking about using the Chrysler switch if your switch was bad.
 Ok, I misunderstood. Thanks!
Dane
1986 F250HD SC XLT Lariat 4x4 460 C6-Sold
1992 Bronco XLT 4x4 351W E4OD
1998 GMC Sierra SLE K1500 350 4L60E
Arizona
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Re: Rear Fuel Tank

grumpin
Well, the shop could not get the sending unit out, the lock ring is rusted to the tank.

I wasn't surprised, they're getting a new tank, sending unit and all. Estimate is $550 or so.

I'll just be glad to have this behind me.
Dane
1986 F250HD SC XLT Lariat 4x4 460 C6-Sold
1992 Bronco XLT 4x4 351W E4OD
1998 GMC Sierra SLE K1500 350 4L60E
Arizona
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Re: Rear Fuel Tank

Gary Lewis
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Will that be a 19, 32, or 38 gallon tank?  The 19 would be stock, 32 would be a Bronco, and 38 would be an aftermarket that will fit.
Gary, AKA "Gary fellow": Profile

Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/ZF5/3.55's, D60 w/Ox locker & 10.25 Sterling/Trutrac, Blue Top & Borgeson, & EEC-V MAF/SEFI

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Re: Rear Fuel Tank

grumpin
19, I don't want to relocate the spare. I know she's thirsty and can always use more fuel!

But I've found I'm usually ready to stop before switching tanks, on longer trips.

I'll be glad to be able to run the rear tank down!
Dane
1986 F250HD SC XLT Lariat 4x4 460 C6-Sold
1992 Bronco XLT 4x4 351W E4OD
1998 GMC Sierra SLE K1500 350 4L60E
Arizona
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Re: Rear Fuel Tank

Gary Lewis
Administrator
Makes sense.  
Gary, AKA "Gary fellow": Profile

Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/ZF5/3.55's, D60 w/Ox locker & 10.25 Sterling/Trutrac, Blue Top & Borgeson, & EEC-V MAF/SEFI

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Re: Rear Fuel Tank

grumpin
Well, they couldn't find a sender unit for the 19 gallon rear steel tank. (I don't think there are any)

They got my old sender out and put the new pump on it, I elected to keep the new tank. Don't want to regret it later! And they called and I picked up my truck, assuming they checked it out.

Filled it up and the pump is not working. Took it back. Another service writer took care of me as the other was gone. He made the comment they couldn't check it as it had no gas in it, which I thought was odd.

New pump may be bad, or the wiring got damaged somehow I'm guessing.

At least they gave me a loaner car, makes it much easier to get back and pick it up.
Dane
1986 F250HD SC XLT Lariat 4x4 460 C6-Sold
1992 Bronco XLT 4x4 351W E4OD
1998 GMC Sierra SLE K1500 350 4L60E
Arizona
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Re: Rear Fuel Tank

Gary Lewis
Administrator
You said "the pump is not working", but is that the sender?

The senders seem to be easily damaged.  The resistance element is apparently delicate.  So, maybe it didn't survive the R&R?
Gary, AKA "Gary fellow": Profile

Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/ZF5/3.55's, D60 w/Ox locker & 10.25 Sterling/Trutrac, Blue Top & Borgeson, & EEC-V MAF/SEFI

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Re: Rear Fuel Tank

grumpin
Pump was not pumping. Sender is working so far.
Dane
1986 F250HD SC XLT Lariat 4x4 460 C6-Sold
1992 Bronco XLT 4x4 351W E4OD
1998 GMC Sierra SLE K1500 350 4L60E
Arizona
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Re: Rear Fuel Tank

grumpin
The new pump was bad. Took her for a long drive.

I'm peeling that onion!

I noticed it wasn't going to vent before it went to the shop. Today while driving it would go to vent and back to defrost when I accelerated. Been looking for a vacuum leak. Now it's staying in defrost, may have to pull the dash apart.

Might replace all the hoses in the engine compartment first.
Dane
1986 F250HD SC XLT Lariat 4x4 460 C6-Sold
1992 Bronco XLT 4x4 351W E4OD
1998 GMC Sierra SLE K1500 350 4L60E
Arizona
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Re: Rear Fuel Tank

Gary Lewis
Administrator
You are peeling the onion.  

On the HVAC, it sounds like you still have a leak.  But it may be a cracked plastic vacuum line going into the HVAC system.  Or the vacuum reservoir itself.  I would check the underhood bits out long before I'd "tear the dash apart".  That's no fun.  
Gary, AKA "Gary fellow": Profile

Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/ZF5/3.55's, D60 w/Ox locker & 10.25 Sterling/Trutrac, Blue Top & Borgeson, & EEC-V MAF/SEFI

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Re: Rear Fuel Tank

grumpin
Everything under the hood looks good. I'll have to start looking into it inside some more.
Dane
1986 F250HD SC XLT Lariat 4x4 460 C6-Sold
1992 Bronco XLT 4x4 351W E4OD
1998 GMC Sierra SLE K1500 350 4L60E
Arizona
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Re: Rear Fuel Tank

Gary Lewis
Administrator
I'm sure I don't have to tell you, but the vacuum diagrams and how things work are here: Electrical/EVTM/1986 EVTM/AC & Heater.
Gary, AKA "Gary fellow": Profile

Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/ZF5/3.55's, D60 w/Ox locker & 10.25 Sterling/Trutrac, Blue Top & Borgeson, & EEC-V MAF/SEFI

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Re: Rear Fuel Tank

grumpin
   Thanks!
Dane
1986 F250HD SC XLT Lariat 4x4 460 C6-Sold
1992 Bronco XLT 4x4 351W E4OD
1998 GMC Sierra SLE K1500 350 4L60E
Arizona
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