My 2007 G35 (w/VQ35HR engine) has turned into my backup car, and I haven't needed to drive it for about 1 year while it just sat in my garage. I tried to start it the other day and the battery was dead (no surprise), so I replaced the battery and it still won't start. I had read that bad fuel could be an issue, so I syphoned everything out of the tank and filled it up with fresh fuel - still won't start. It cranks just fine so it's not the starter, and I can hear the electrical whine of the fuel pump when I turn the car on. In other cars I could check for fuel pressure by simply using a screwdriver on the pressure valve to see if fuel sprays out, but this engine doesn't appear to have a valve. Is there any way to check for fuel pressure? Or does anyone have any other suggestions or ideas?

 

U need to install a special adapter to check for fuel pressure on these cars.

Is your intake clean? (Mice can build nests in there over time).

Are u getting spark?

 

Could be the injectors are fouled/clogged from the bad gas sitting. I'd verify you have spark too.
You could try spraying some starting fluid into the intake manifold (maybe through the PCV ports) to try to get the engine to light off at all.

 

Intake is clean. Haven't yet checked for spark, that's the next thing I'm gonna due. And bummer about needing a special adapter to check fuel pressure on this engine, that's ridiculous. I looked it up and seems like I could just disconnect that damper and crank it, or even just push the button once without the brake depressed to trigger the pump to come on, and see if fuels sprays out, no?
Yeah, hope it's not something like an injector. But for it to not start, wouldn't all of them need to be clogged? And to me that seems unlikely to happen in a year. I've let other vehicles sit for a year before with gas in them an no issues.

 

Maybe a bad fuel pressure regulator, lots can go wrong yk what they say fuel air compression and spark !!