SICK 351

If it did fine on the first pass and started acting up on the way home, maybe the fuel filter got clogged in that amount of time it was doing fine. Maybe you need to clean your tank, and install new lines. Are you using any of the black rubber hose anywhere, after time this material begins to break down, and cloggs fuel filters horribly.

jmho

Get down to some serious thinking here, guys. Hook up a fuel pressure gauge, and drive the truck. Obviously monitoring the fuel pressure. 30 psi (regulated/w/vacuum/idle). Anywhere from there on UP to 40 psi, (plus/minus 2-3), unplugged, and/or under throttle.
That vehicle has 2 seperate fuel filters on it. The one large one on the frame, and possibly another inline one on the pressure line behind the intake/bellhousing area. (depending on build date).
That, or it's got the 2 on the frame. In either case, I've seen lots of people chaseing their tails for LONG time, throwing LOTS of parts when it's just been a simple fuel filter related problem.

Secondly, IF the filters are ok, it's possibly a pump (in tank), problem.

Now, if you're ruled out fuel (pressure/volume), cats won't do it. IT'd do it all the time. There would be no good times/bad times. (well, there could be this once, but I haven't seen it).

Ignition.............not likely. If you're replaced all the secondary ignition, the possibilities of a magnetized distributor, (don't ask), are fairly remote.
If nothing else, unplug the spout and drive it, see what happens.

If it jumped time, again, it'd do it all the time, besides either being gutless as hell, plus lots of other concerns.

I'll sit here and think of any other silly little things come to mind.

KISS...........Keep it simple......................sir..............[img]/phpBB/images/smiles/icon_wink.gif[/img]
[addsig]

i just sold my 92 F150 with the 351W....Dual tanks is key here.

the rear tank would run fine, the front take would do EXACTLY what your saying. after a few fuel pumps, gate valve, and filters, the problem was still there. i had alot in it going this far, along with all the other goodies, like cap, rotor, plugs, wires & such.

come to find out, i had a bad connection from the fuel line to the fuel filter block (the large one on the inside of the frame).....only when under pressure! small hair line crack that flexed when the fuel pump was pumping.


[addsig]

SORRY I HAVEN'T BEEN ON FOR AWILE JOB IS TAKING UP TO MUTCH TIME. I HAVE RULED OUT THE FUEL PUMP IT IS THE SAME WAY ON EATHER TANK I'M ASSUMEING THERE IS TWO FUEL PUMPS WITH DUEL TANKSI CAN'T FIND A KINKED FUEL LINE AND THE IDEA OF TWO FUEL FILTERS IS INTERESTING I WILL LOOK FOR THE OTHER ONE. IT'S F!!!KING COLD HERE SO IT WILL HAVE TO WAIT UNTILL WARNER WEATHER. JAY[img]/phpBB/images/smiles/icon_bicker.gif[/img]