I had a theory after my mom's car sat for 9 months and ran funny, that there was water in the tank from condensation so I added HEET and that didnt seem to work well so I decided to drain the tank, I bought a cheap Pennzoil Siphon Pump from Walmart (do not buy it, it is ••••), the hose was too short, but I got to thinking of other ways, I didnt want to drop the gas tank to empty it, so I started to think, I remember a few weeks back when I changed the head gasket, I remembered on the fuel line the fuel pressure release valve just before it connected the fuel rail, I noticed there was a tire compressor in the trunk so I cut the hose and used the tire connector part to hook my siphon line to the pressure valve, got in, started the car up to run the fuel pump and it filled my jugs up, got 4 1/2 gallons out and it died, so now that the pump isn't picking any fuel up how much is left?, should I add more HEET and refuel?