When is it really empty?

The question should actually read when is my gas tank empty. I just wanted to see if any of you would suffer pangs of memory guilt. Better yet, do you have a history of driving the car plain out of gas. Do you?

Is it more than likely if the engine stalls and won't restart that your first thoughts are of gasoline? Or what about the light that resembles a tiny gas pump. Does it flash or steadily glow yellow? And it's been doing that for nearly thirty miles so far...?

Look at what 30,000 miles of repetitive vapor driving left in a new fuel filter. That crap was the fuel pump, it was new, but now it doesn't work. look. 

One fact we all seem to forget, this includes myself, our vehicles have fuel pumps. These fuel pumps feed the fuel injection system; they're the heart of the system you could say. These fuel pumps are submerged in the gas tank for a reason.

The internal parts of a fuel pump are cooled and lubricated with the fuel in the gas tank. Let the level run low and the fuel pump wears out at an accelerated rate. So to keep the fuel pump alive try to make QUARTER FULL the same as empty.

It is so rewarding to finish!

Six hours to trace out all fuel system controls; both electrical and mechanical. The bad part was found. It was the PCM or computer that was cycling powers and grounds off so rapidly a lab scope with a high millisecond grid was the only tool that saw the problem. Using a breakout box paired with a lab scope was the trick. Diagnostics time, and final restoration of this Ford trucks’ sensors system would all be a learning experience. Sorry about the tech speak; just excited.

Someone had to find the problem; you can’t just throw away hard to diagnose vehicles. Lucky me, I guess.

This what it looks like when things are working!

One millisecond of data

Other problems found were engine oil mixed contaminated with gas.

DPFE was melted down. The catalytic convertors had been removed and tossed!

All four of them were needed for the system to work properly.

Spark plugs were so carbon fouled they were useless so they were replaced with original brand Motorcraft Platinum plugs.

Incorrect O2 sensors were not helping the problem either, new OE cost almost the same as NAPA. All testing drilled down to a PCM not supplying ground OR power to internal board component logic modules.

But what caused this to happen? My guess is a simple jump start, zappp! Do you have any ideas?