Question about Cars & Trucks
These are generic in nature and can apply to virtually any fuel system. Bottom line, the fuel system is plugged. The question is: Where?
It could be the selector but unlikely. Are there individual filters for each tank? Could be plugged. You could also.have debris in one of the tanks. And the tanks have to vent. Otherwise you're pumping against a vacuum. Leave the cap off the tank that doesn't pump. If it still doesn't work, you've eliminated that possibility. If it pumps, you either need a new cap or there is a problem with anti-pollution system. If the caps are interchangeble, try switching caps before you spring for a new one.
If you can get to the hose where it hits the selector, disconnect it and see if you get fuel. Be ready to catch the fuel and plug the line until you can reconnect. If nothing happens, is there a filter between the tank and the selector. Find it and dsconnect hose from inletand chech for flow. Again be ready to plug it. If you have flow, likely a plugged filter. No flow means that either the line is plugged or there's crud in the tank. Blow air into the disconnected fuel line. When you quit blowing, avod a mouthful of fuel. If nothing happens, I'm stumped. You've eliminated crud and plugged filter to the selector.
If still no good and you're certain you blew air through the hose and it reached the tank, you're stuck with one possibility: the crud in the tank settles and seals the fuel line when you quit blowing.
As I said, these are intended to be generic, not just F-100. You're approach is to make a list of all components and then a list of possible causes for each item in te list. Finally a list of tests you can perform for each of those causes.
Posted on May 03, 2017
Yes, the switch is usually a solenoid, check to see if it is getting proper voltage and if so, listen for it to click, the clicking is it engaging.
Posted on May 03, 2017
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Posted on Jan 02, 2017
SOURCE: Dual Fuel Tanks
PROBLY NEITHER THE VALVE THAT SWITCHES TANKS IS UNDER TRUCK PROBLY AT CROSS MEMBER.IT WILL ACT UP ALOT OF TIMES BEFORE GOING OUT.CHECK IT OUT FIRST OR REPLACE IT AFTER CHECKING FOR POWER AND TRANSFER OF VALVE CLICKING WHILE SOMEONE ELSE SWITCHES TANKS FROM SWITCH.HOPE IT HELPS YOU
Posted on Jan 04, 2009
See these two threads for more info, I've heard of this happening before, in fact at one time there was a recall from Ford regarding this exact issue - http://www.fordf150.net/forums/viewtopic.php?p=227833 - http://www.fordf150.net/forums/viewtopic.php?p=46861
Posted on Feb 12, 2009
SOURCE: front fuel tank will not work
You have duel tanks with a fuel pump in each tank. You also have a fuel pump on the frame rail after the "tank selector". This device only holds a fuel filter that protects the main fuel pump. When you select front or rear tank on the dash, you are selecting which in tank fuel pump will operate. You can check the in tank fuel pump by listening for it to "humm" when the key is turned on..The in tank pumps only feed the main pump and cannot run the engine on their own. Hope this helps
Posted on May 16, 2009
I have a 1996 f150 and I had the same problem. I finally found out that the rear fuel pump is the main pump, and if it goes out then the front pump will not work either. There is a groud that both pump share on the rear cross member. If you are not getting good connection with the ground the fuel pumps will not work. Also if you replace the rear pump and it still does not work then your problem could be the fuel tank selector switch, it acts as a relay if it goes out then neither pump will work.
Posted on Aug 10, 2010
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