[Tom Evans]

I have a 2002 Suburban with a 5.3L FLex Fuel engine (code Z). It won't start at all. Not even a lick. I checked the fuel pressure Schraeder valve and got a little gas when I depressed it. I then tried spraying a little starting fluid (ether) into the throttle body. The engine caught and ran for a few seconds.

I can hear the fuel pump run for a few seconds and then stop when I first turn on the ignition switch. There are no trouble codes set.

Any suggestions as to where to go next for troubleshooting?

Thanks.

 

[Revredneck]

You need to put a fuel pressure gage on that fitting and get an accurate reading. Just because there's fuel present doesn't mean it's getting enough. I'm not sure what the correct reading should be, but I'd be willing to bet you need a fuel pump.
Good Luck and God Bless

 

[Tom Evans]

I took your advice and went to Harbor Freight and bought a fuel pressure gauge. Virtually zero pressure at the test port on the fuel rail. I had resigned myself the replacing the fuel pump. I had also bought a fuel filter today and decided to replace it today since I stank of gasoline already. While replacing the filter, I got a whoosh of fuel when I removed the connection going to the fuel pump. I didn't expect that. I completed the installation and decided to try the engine once more. It cranked for a long time and I was just about to stop cranking when it sprang to life and settled down to its normal smooth idle.

I have had several Diesel engines stop due to plugged up filters (due to bacteria), but have never had a gasoline engine refuse to run due to a clogged fuel filter.

After replacing the filter, the fuel pressure read a steady 45 PSI.

I wish modern tanks had a drain plug, but the accountants have prevailed in automotive design. My two Diesels have drain plugs on their tanks and I "drain the swamp" about every two-three years.

 

[Revredneck]

Glad to know you got it figured out.