Just re-read your post & I missed the part about not starting at all, duh!
To get mine started this year I ended up going through about a dozen plug changes ( I had a bunch of spares). I had gas & spark as well. Long process but once I got it running, it was fine. I wrote that off as a combination of stabilizer, old gas & fogging oil. If I let this thing sit for 2 or 3 weeks, it starts hard......that's the fuel pump issue, I think???
Never had an issue when I could start them up occasionally in the summer, just wasn't able to do that this year so they sat for about 8 months. I say they because I had the same trouble with the SRX.