fuel sys meltdown under dash
Thread Starter
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Lead Driver
Joined: Oct 1999
Posts: 6,782
Likes: 558
From: Kalispell, MT
fuel sys meltdown under dash
I could use some help. 88 F250 gas/dual tanks. When I bought the truck the rear tank didn't work, but gauge appeared to.
Recently installed a new in-tank fuel pump in the rear tank. Had to put a new connector on the wires as the old one crumbled when it came off. I'm pretty sure I got them back where they should be.
Dumped in 10 gal gas and went for a ride. Engine ran fine on the rear tank. Gauge didn't seem to come up where it should have - stayed near empty.
After 5 miles I smelled hot electrical and then saw the smoke under the dash around the tank selector switch. Shut things down immediately and tore the dash panels off - no fire but did melt things.
Selector switch wires brown/white and red/yellow melted and switch bubbled around the 2 and 3 pins. Only melted as far as the connector.
Inertia switch melted down - both wires and the switch.
Didn't blow the fuse.
Did I screw something up when I connected the in-tank pump? Or is the cause likely something else? Any ideas appreciated. Thanks!
Tim
Recently installed a new in-tank fuel pump in the rear tank. Had to put a new connector on the wires as the old one crumbled when it came off. I'm pretty sure I got them back where they should be.
Dumped in 10 gal gas and went for a ride. Engine ran fine on the rear tank. Gauge didn't seem to come up where it should have - stayed near empty.
After 5 miles I smelled hot electrical and then saw the smoke under the dash around the tank selector switch. Shut things down immediately and tore the dash panels off - no fire but did melt things.
Selector switch wires brown/white and red/yellow melted and switch bubbled around the 2 and 3 pins. Only melted as far as the connector.
Inertia switch melted down - both wires and the switch.
Didn't blow the fuse.
Did I screw something up when I connected the in-tank pump? Or is the cause likely something else? Any ideas appreciated. Thanks!
Tim
Cargo Master
Joined: Aug 2003
Posts: 3,237
Likes: 3
From: Belleville, Ontario
Just a real quick guess, the selector switch hadn't been used for quite some time & the ground got corroded?
What are the colours of the wires to the rear tank fuel pump?
These should be 2 separate circuits?
AL.
What are the colours of the wires to the rear tank fuel pump?
These should be 2 separate circuits?
AL.
Moderator
Joined: Jan 2001
Posts: 57,025
Likes: 2,756
From: Virginia
Here's a diagram that has a little bit of info on your wiring.
http://www.autozone.com/images/cds/g...3d800a3a44.gif
I would venture to say there is something wrong with the wire going from the switch to the rear fuel pump/tank.
http://www.autozone.com/images/cds/g...3d800a3a44.gif
I would venture to say there is something wrong with the wire going from the switch to the rear fuel pump/tank.
Thread Starter
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Lead Driver
Joined: Oct 1999
Posts: 6,782
Likes: 558
From: Kalispell, MT
Thanks for the info and links. I'll check it out and let you know what I find. Is it possible for the pump to work and still have a bad ground or bad wire? That's what's throwing me off.
I 'spose it could carry some of the load, enough to run the pump, but the defective wiring draws too much current and heats things up slowly. It took about 10 minutes of driving for this to get crispy.
Again, thanks. You guys are terrific!
I 'spose it could carry some of the load, enough to run the pump, but the defective wiring draws too much current and heats things up slowly. It took about 10 minutes of driving for this to get crispy.
Again, thanks. You guys are terrific!
Moderator
Joined: Jan 2001
Posts: 57,025
Likes: 2,756
From: Virginia
Originally Posted by mtflat
Is it possible for the pump to work and still have a bad ground or bad wire? That's what's throwing me off.
I 'spose it could carry some of the load, enough to run the pump, but the defective wiring draws too much current and heats things up slowly. It took about 10 minutes of driving for this to get crispy.
I 'spose it could carry some of the load, enough to run the pump, but the defective wiring draws too much current and heats things up slowly. It took about 10 minutes of driving for this to get crispy.
