No gas to the carb

Asked by Aug 23, 2019 at 02:02 PM about the 1978 Ford F-250

Question type: Maintenance & Repair

I have a 78 ford f-250 king cab factory tow package(heavy half) with a built
400.
Trucks been sitting for years, added gas to both duel tanks, truck would not
start.
Primed the truck, it started and I let it run for a couple minutes.
Went back next day - truck would not start, primed it and it would start but
wouldnt stay running.
Traced fuel lines from both tanks to a inline fuel filter mounted on side wall
on drivers side near the back seat. All rubber lines were deteriorated badly
as I replaced lines gas from rear take was extremely dirty, stinky, and
drained the tank. gas out of front tank appeared clear and fresh.
Several auto parts store could not find a replacement fuel filter matching
what I had, searched online for anything close in comparison, nothing
identical, this filter had an electrical plug probably running to switch on dash
triggering which tank was in use, and gas gauges possibly?
The closest filter online was a pricey $150+ and did not include the electric
connection.
Since the back tank was in condition it was, or the gas was and to save
money I went with a basic fuel filter for that model vehicle without duel tanks.
As I installed new lines(capped rear tank line) and filter, no gas was coming
out of front tank. I blew into line and created a vacuum, clean gas came
streaming out and quickly finished connection.
Primed it, it started, still would not get gas up to carb. Removed mechanical
fuel  pump(which had been replaced not long before vehicle was
parked)inspected and forced operation getting full pressure on both the in
and out ports. Reinstalled pump, primed it, still same results, not getting gas
to the carb. Up by the carb as gas line comes in there is about a 8 inch
rubber section I went ahead and replaced just in case was loosing vacuum it
was slightly deteriorated as well. As I did I blew into line again could hear the
gas in tank bubbling.. no vacuum created(did not try and draw it up to carb).
Primed, no gas to the carb. I also cracked it by the key for many minutes
hoping the mechanical pump would pull gas up to carb.
As I reinstalled the pump visually inspected best I could inside where arm
goes into. Appears the timing chain engages the unit and timing chain looked
intact no damage and not loose. And vehicle wasnt missing badly for short
time it did run.
If I can not figure out whats stopping the creation of a vacuum getting gas to
carb Im thinking of installing a cheap inline electrical pump right before the
carb, either running it to starter or to dash with a switch. Any ideas anyone,
or information on flow rate(psi) for electric fuel pump should be?

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