Crank, spark, no start

[Canadian Rust Bucket]

Hi all,
I had an issue crop up with my '95 c1500 350tbi over the weekend and I have exhausted my diagnostic abilities. I have also read up on the forum to try to figure this out but am at a loss.
The sequence of events:
-Pulled the truck out of the garage Saturday, it gave some grief starting. Had to hold the throttle down slightly to maintain a smooth idle. More pressing issues at the time, so did not investigate promptly.
-Turned the truck off.
-Attempted to start the truck the next day, no dice.
-checked the voltage at the fuel pump harness, pump has 11v with the key on. Good spray from the injectors when cranking.
-Put 20 litres of fresh gas in the tank, which was reading at just below 1/4.
-checked spark by pulling #1 and #3 plugs, good arc across the gap. Measured the gap at .035 as per my manual. Plug is carbon fouled, but nothing extreme.
-checked timing, the distributor rotor + cap are set correctly and match when #1 is at TDC.
-Cap, rotor, plug wires, fuel pump, spark plugs, starter, ignition coil, all less than 2 years old and with less than 10km on them.
-No scan tool to read obd1 data on hand, and no codes showing with the jumper wire/CEL.

At this point, I've checked everything I know how to check. Are there any potential culprits I've overlooked?

Thank you for your help!

 

[Erik the Awful]

Look at your TBI barrels while cranking (do not put your head over the TBI, though). Are your injectors firing?
Doh!

Good spray from the injectors when cranking.

Bad gas?

 

[Canadian Rust Bucket]

Bad gas?

I put fresh gas in after the initial no-start, with no change afterwards. The bit of old gas in the tank was about ten months old, though.
I'll find a way to test it to rule it out.

 

[Keeper]

Had to hold the throttle down slightly to maintain a smooth idle.

fuel filter?

 

[Canadian Rust Bucket]

fuel filter?

Good idea! I have a spare on the bench, I'll swap it in tonight. At the very least that should eliminate fuel delivery as a potential cause.

 

[Keeper]

another thought is plugged air, either coming or going

 

[movietvet]

You said good spray from injectors when cranking. What is the fuel pressure? But, if you are getting any fuel at all, down the throat, it should at least sputter. If looking at the fuel spray, you have air getting in there.

 

[Canadian Rust Bucket]

You said good spray from injectors when cranking. What is the fuel pressure? But, if you are getting any fuel at all, down the throat, it should at least sputter. If looking at the fuel spray, you have air getting in there.

There's no stock fuel pressure gauge, right? I'll have to add one to check the pressure. I had the same thought w.r.t. getting fuel down the throttle body, but I'm not getting any ignition. Even when I tried pouring it in manually, nothing.

 

[movietvet]

You said you checked spark at #1 and #3 plugs. Blue spark or orange spark? Blue spark is good. What do ALL the plugs look like?

 

[Canadian Rust Bucket]

You said you checked spark at #1 and #3 plugs. Blue spark or orange spark? Blue spark is good. What do ALL the plugs look like?

Blue-white spark. I can pull the other plugs, just hadn't yet. Is there anything in particular I should look out for when I do?