Trying to Start my engine up and I have a spark but won't run. I noticed that my fuel tank isn't getting any fuel back down the return pipe to the tank. Would this cause a problem with it running?

Is there any fuel arriving at the fuel rail?

Is there fuel getting to the TB's?

Are your feed and return lines connected to the right ends of the fuel rail? You wouldn't be the first to have the feed going in the return end (where the reg is) of the rail.

With the engine off, but pump on is there full flow on the return ?

[Edited on 6-2-15 by ken555]

Main things to check are as follows

Compression
Spark
Fuel
Timing.

If all of those are right it should run.

Carl