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1987 f150: efi ac auto trans..tanks..road and after several tries

Customer Question
I have a 1987 F150...
I have a 1987 F150 5.0 EFI AC auto trans dual tanks. Sometimes it will stop running while i'm at a stop or when i'm moving down the road and after several trys it starts and may not do it again for days or weeks what could this be?
Submitted: 8 years ago.Category: Ford
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Answered in 1 minute by:
6/19/2010
Ford Mechanic: Tim Mohr, ASE MASTER TECH replied 8 years ago
Tim Mohr
Tim Mohr, ASE MASTER TECH
Category: Ford
Satisfied Customers: 16,700
Experience: 30 YRS EXPERIENCE, FOREIGN AND DOMESTIC, GAS AND DEISEL
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Hi, my name is XXXXX XXXXX it dies, can you switch tanks and it starts?
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Customer reply replied 8 years ago
sometimes I have switched the tanks but can't seem to tell whether it makes a difference.It does not seem like its running out of fuel like an older car would if it was carberated but more like it just shuts off.
Ford Mechanic: Tim Mohr, ASE MASTER TECH replied 8 years ago
This still sounds like a bad fuel pump, you will need to check for fuel pressure when its dead,Tim
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Customer reply replied 8 years ago
Both the sender and fuel pump assemblys and cross over switch and frame rail pump have been replaced by ford just recently do you think they could be failing
Ford Mechanic: Tim Mohr, ASE MASTER TECH replied 8 years ago
well, its possible, but we need to determine first if we are losing pressure, if you have good pressure, we can look at the ignition system, have you checked for spark when its dead?
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Customer reply replied 8 years ago
obviously when I am sitting on the side of the road trying to restart my truck I am not performing these tests. And if I get it towed in and it starts and runs fine whats does the mechanic possibly look for?
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