Posted this on oilburners, and thought someone here might have a clue.


Quote:
Originally Posted by fsmyth View Post
Me, too. New injector pump, cranks great cold. Homebrew pump system similar to
FASS (dual pumps in parallel, dual frame filters). Did NOT have this problem
before the VP44 died, tho.
Pumps off while cranking, max pressure while cranking - no difference.
Finally finished killing the starter Replacing it today.
One oddity - I hooked the pump relays back up to the ECM (the wire that
used to run the pump on the block, and now that hookup no longer runs
the pump after 1st crank (the 3-second thing), but does keep the pumps
running for about 10 seconds after the key is turned back OFF. WTF?
<als>

Replaced starter. Now turns over like it should. Now it will not crank at'all.
Got a scan tool.
First scan: 1388 (auto shutoff relay), 1689 (manuf. specific powertrain...)
Cleared codes.
Second scan: 1694 (no engine bus...), 1693 (communication w/ECM)
Previous to this, O'Reilly scanned it, found 0463 (fuel level sensor),
0336 (crank sensor), and 1693 (comms w/ECM). These codes did not
come back after clearing.
Fuel pumps still acting stupid ( 1/2 sec run at crank, then shut off,
do not come back on for 5-10 sec. like they should). They DO come on
for about 15 sec. AFTER THE KEY IS TURNED OFF and REMOVED.
What now? Any guesses?
<als>
__________________
'98.5 2500 - bone stock w/added fuel pump, filters, gauge, boost gauge.

 

RPM on the gauge while cranking?
Fuses and Relays?

Doesn't sound like a lift pump issue, more of a communication issue with the pump.

 

try swapping the fuel system relay with a different relay under the hood and see if it makes any difference?