Fuel pressure?
 

Ok, I got done putting everything back(HG repalce). Truck will not start :(. It has spark, fuel is in the rail. Not sure if its at the correct pressure, gonna test the pres tuesday, it has 1/4 tank of gas. I'm worn out, three straight long days of work.

How can you pressurize the fuel system or does the truck do it on its own?

If I have low pressure what is most likey the cause? Rave says renew fuel pres regulator if pres is low.

It should prime on its own. Good fuel pressure is 2.3 to 2.5 bar

So if I don't have that, then it may be the filter or regulator?

My truck had a mysterious no start issue after replacing my crankshaft seal. I ended up just cranking and cranking and holding down the gas pedal and it finally chugged to life. Never had a single start issue before of since. It's worth a shot.

I thought that so many cranks could make it seize up. I'll give it a shot but I don't like just crankin and crankin.

Push button on top of inertia switch. Fuel pump should kick on when key turned on, before that crank position. Pump should run just a few seconds. Pump draws like 5 amps. FPR has six inch long vac hose that needs to be plugged in. 32-34 PSI pressure is expected at passenger side rail test port valve. Check F6 and F7 in underhood fuse box, F3 in satellite fuse panel under dash.

Not desired to crank and crank. Starters can overheat. If you have done a lot of this may need to charge battery by other means.

Damnit!, On my way to work I rememberd I didn't tighten a cable, cable under the throtle( one that has the plastic knob to adjust idle) would that be a cause :o. I'm gonna tighten when I get a chance.

Yeah normally I wouldn't recommend just cranking away. Just thought I'd share a weird experience/solution I encountered first.
Verify the fuel pump is running first. Then make sure the fuel is getting to the rail at the correct psi. Then move onto spark and air.
But first connect that cable. ;)

So the kick down cable if not connected would stop a disco from starting?

No luck, all fuses are good, pump can be heard and gas smell present. FPR hose is plugged. :confused: