I have two 1992 ford f-150 and they are both doing the same thing. when I am driving it start to act like it is trying to vapor lock, after it sits awhile it will start but will do the same thing again. what can be the cause of this?
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It could be a vapor lock but not likely. Since the introduction of fuel injection vapor lock has been eliminated. You need to figure out if you are loosing fuel pressure or spark when it will not start back up. Could be a fuel pump relay or ignition module among other things. Even a problem with the vent for the gas tank.
Fuel Pump-a possible. The time frame of 30 minutes will vary.
The armature on the pump motor is worn, as well as the tiny bearing,so it seizes or just stops conducting current.
Drop fuel tank and replace. May be able to remove all bed bolts but rear ones, and tip bed up.
I would forget the vapor lock theory. It ran okey for years,so why not now
Vapor lock goes back 35 years to carburators and road race cars.
Do you ever get a Mil Light on dash or stored codes?
What tests were done to warrant O2 Sensors?
Did you have any overheating issues,or just thinking so?
Don't overlook an old and partially blocked converter. You haven't said what your drivability issues, really are!
Fuel systems aren't really to heat sensitive or know when summer is here.
You need to think simple, Ignition,fuel filter,pump could be partially plugged and working, but not much volume.
Tape a fuel pressure gauge to windshield and go for a drive.
when they went to fuel injection the fuel that was not used returned to the tank thus cooling the fuel and ending vapor lock, my question is did you do a fuel pressure test? and di you do a fuel leak down test? and the first thing I would do is change the fuel filter. with ethanol in the gas it kills the filter. I have to replace mine every three months they just plug up from that junk. Other than that the only other thing would be a coil breaking down when it gets hot the coil shorts out when cool it starts so check those things first. be sure fuel pressure is 50 to 60 PSI and does not drop below 30 PSI for at least a minute, if it does the fuel pump check valve is bad, also the fuel sock could be bad as well.
I had my 1999 xlt do this to me last month when we were having 95+ degree weather and I was driving in the mountains. It just stalled on me. I let it sit for a half hour and drove fairly slow with the windows down and no air. I was told that it vapor locked on me?? It hasn't acted up since. Who knows!
If we could run a test on your car when your
problem occurs, we would probably find a faulty
starter. The next thing we would check
would be a bad connection in the wiring,
especially the main power wire...could also be a