You're absolutely right about your problem being a Fuel issue,since its requiring an alternate fuel source to start and its actually able to start period.IOW - if the no start was due to a no spark issue,it would not have started at all,even with the alternate fuel source.....
A no start due to a fuel issue is usually either low/no fuel pressure,no injector pulse or a engine flood condition.However,since the engine is requiring you to add a alternate fuel source to allow startup,an engine flood condition can likely be ruled out,which should also rule out the possibility of a stuck open/leaking FPR or leaking injector.
If you cant hear the fuel pump running its 2-5 second priming sequence when the key is turned on,check the inertia switch first to make sure its not tripped.If its good & the pump is running its priming sequence,try cycling the key on/off (for a few seconds each time) 4-5 times then attempt a startup.If it starts,thats usually an indicator of a weak fuel pump or possibly a leak inside the tank,like a leaking fuel pump "S" hose or a split fuel supply pipe on the fuel pump hanger assembly.If it still doesn't start,do this to make sure injector pulse is present:: Use a noid light or test light for this test.Disconnect the easiest to access injector harness plug.If using a test light, once you disconnect whichever injector harness plug you're gonna use for testing, get a paperclip to insert down into one of the harness plug terminals,then attach your test light clip to the paperclip.Touch your test light probe to the other plug terminal then get an assistant to crank the engine with the key.If assistant isnt available,make sure the transmission is in neutral (T5) park (AOD) & use a long screwdriver to jump across both large posts on the fender mounted solenoid and this will manually crank the engine over.Do NOT fail to put the shifter in N or P or your car will run you and everything else over,because when you jump the solenoid it bypasses the clutch safety & neutral safety switch.Once the starter begins turning over,the noid/test light should flash repetitively if the pip sensor is working.If the light flashes,you've got injector pulse.A fuel pressure test should be done now.
91 LX 342ci (10.5:1)
TFS 190cc (stage ll)
TFS Track Heat
Flowtech 1 3/4" Shorties
Weld ProStar XP'S
ISIT EVER ENUFF
Last edited by wbrockstar; October 10th, 2019 at 08:06 PM.
Reason: Added info