Fuel delivery issue---Help!!

I have a 1988 F-150 4x4 with the 4.9L inline-6 and manual tranny. I recently replaced the timing gears and when all was reassembled, i found i was getting no fuel. When i ground the the fuel pump slot on
the diagnostic connector, the truck will run but it will not idle and if i unplug the shunt the engine will race a bit as if i just leaned out the mixture and then dies immediately. I have replaced the fuel filter and fuel pump relay but this has not changed the situation. The truck has dual tanks with in-tank passive pumps and an in-line high-pressure pump on the frame rail. The truck IS in time, running smoothly (if a bit loaded-up sounding) as long as the shunt is in the diag. connector. Any suggestions as to what to try next will be greatly appreciated since i am now beyond the limit my technical expertise...(way beyond...) Thanks
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snipped-for-privacy@gmail.com wrote:

What is the spark timing when you have it running, shunted?
I think you have more than one problem, but start there.
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Backyard Mechanic wrote:

Timing set at 10 degrees BTDC according to Alldata.com specs (the emissions sticker is gone from the engine compartment). I dont know what it is without the shunt because it dies within about 3-4 seconds after removal but i am sure i can manage to find out. Will post as soon as i get it.
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No... doesnt matter.
Want you to see what the timing is with the FPRelay shunt in so to keep it running.
If it's 10 deg with the SPOUT connector installed or not, that tells us something. That the timing pulse isnt getting to ECM.
You didnt mention if Fuel pump ran at key-on cycle
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Doooohh. no sooner posted that than I realized you wouldnt be getting injector pulses if no spark signal to ECM Would hurt to check anyway.. but I think we need to know if FP runs initial key-on

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6 degrees BTDC with SPOUT sensor out, bumps itself to 10 with SPOUT in, and yes, the high-pressure inline pump on the frame primes itself at key-on although i cant hear whether the selected in-tank passive pump is priming. With the shunt in, all 3 pumps run simultaneously, although according to the never-wrong Haynes manual <insert sarcasm here>, only the selected in-tank pump should run. Backyard Mechanic wrote:

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Well, that spout-in timing doesnt sound right.. but I'm thinking you have a problem with your tank selector/relays/solenoids
And I dont know where they are.
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