87 F250 TSV Question
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Junior User
Joined: May 2007
Posts: 65
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From: Connecticut
87 F250 TSV Question
Ok guys I have a new prob with my truck, was out plowing the other day and truck stalled like it was out of gas, got it started, went to station and filled it but it only took 6 gallons.
(acting like it is trying to run on rear tank wich doesn't work)
wouldnt restart without priming carb.
Now it wants to stall going uphills or after running for a period of time (like plowing)
BTW 1987 F250 4X4 351 4BB
I have allready replaced the mechanical fuel pump, now im thinking the selector valve is s###ting the bed for good.
Any suggestions??????
(acting like it is trying to run on rear tank wich doesn't work)
wouldnt restart without priming carb.
Now it wants to stall going uphills or after running for a period of time (like plowing)
BTW 1987 F250 4X4 351 4BB
I have allready replaced the mechanical fuel pump, now im thinking the selector valve is s###ting the bed for good.
Any suggestions??????
Moderator
Joined: Dec 2001
Posts: 22,436
Likes: 17
From: Louisville,Ky.
Could be the selector valve. I also wonder if the tank is venting properly? Try driving with the gas cap off for a bit and see if it acts up.
I have also seen dry rotted rubber lines from the tank to the frame allow air to be sucked in and cause it to lose it's siphon.
I have also seen dry rotted rubber lines from the tank to the frame allow air to be sucked in and cause it to lose it's siphon.
Thread Starter
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Junior User
Joined: May 2007
Posts: 65
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From: Connecticut
Thanks for the info. will check the lines, but wouldnt i see leaking fuel somewhere? I do smell gas when this happens but dont see any leakage.
Kind of hard right now to check frame rails as it is all frozen snow/ice
Could it be an electrical problem?
Kind of hard right now to check frame rails as it is all frozen snow/ice
Could it be an electrical problem?
Moderator
Joined: Dec 2001
Posts: 22,436
Likes: 17
From: Louisville,Ky.
Usually, for some reason, the lines won't leak, but will allow air to be sucked in. Odd but true. As for electrical, I guess you could check for voltage at the selector if it has connections.
Thread Starter
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Junior User
Joined: May 2007
Posts: 65
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From: Connecticut
ok, and there is an electrical connection at the selection valve, 6 wires I think that is why I asked if it could be electrical, shorting out causing it to switch to the rear tank,
Hasnt snowed in a couple of days now and havent had any problems, which is also why I asked if it could be elelctrical, not sure if the truck has internal low pressure pumps or not.(Havent had time to drop tanks to replace sending units yet)
As far as venting replaced both caps recently, and there is no pressure build-up when caps are removed for fueling, which leads me to believe that the system is venting properly.
Hasnt snowed in a couple of days now and havent had any problems, which is also why I asked if it could be elelctrical, not sure if the truck has internal low pressure pumps or not.(Havent had time to drop tanks to replace sending units yet)
As far as venting replaced both caps recently, and there is no pressure build-up when caps are removed for fueling, which leads me to believe that the system is venting properly.
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Moderator
Joined: Dec 2001
Posts: 22,436
Likes: 17
From: Louisville,Ky.
I think that only the 460 with hot fuel option had electric pumps.
If you have more than 2 wires going to the sending unit, then it may have pumps. 2 for the gauge and 2 for the pump.
If you have more than 2 wires going to the sending unit, then it may have pumps. 2 for the gauge and 2 for the pump.
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