93 f150 fuel problem need answers

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Joined: Sat Jan 28, 2017 5:23 pm

93 f150 fuel problem need answers

Unread post by Drewh » Sat Jan 28, 2017 5:29 pm

Have a 93 Ford f150 dual tanks had it running one day and the next day wouldn't start it's a fuel problem, none getting to the engine any suggestions

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Re: 93 f150 fuel problem need answers

Unread post by carriedi » Sun Jan 29, 2017 3:10 pm

need more information. How do you know it's a fuel problem? What is the measured fuel pressure at the fuel rail? Both tanks won't work? Can you hear the fuel pumps run when you cycle the key? )Key on engine off) Do you have spark? do you have injector pulse? Will it run with an external fuel source?

you have dual tanks. each tank has it's own fuel pump. Power for both tanks goes through the inertia switch. Actually, it goes like this: power comes from fuse o in the engine compartment to the fuel pump relay (on a yellow wire). Next to the inertia switch (on a dark green and yellow wire). Then it goes to the fuel tank selector switch (on a red and yellow wire). From there it goes to the fuel pumps (red wire for the front tank and brown and white to the rear tank).
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