There is a metal tab in the tank that usually opens when you put in the pump for fueling. This tab will not close back up and now m check engine light is on all the time. When I take off my gas cap It is wet from fuel. How do I repair this and can I buy a new part at auto zone?
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Re: Vacuum pressure in Gas Tank
Well the tab will not cause the light to come on if the gas cap is loose or bad it possibly would make the light comeon because the emissions system would detect a leak. The only way to fix it would be to go to the junk yard or dealer and get a new fuel fill neck
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the evaporative emission system (EVAP) control system pressure sensor has sent high voltage to the ecm or engine control module and triggered this code either the purge valve located under the car by the gas tank has gone bad, or the charcoal canister has become gas soaked and is pressurizing from gas fumes, or the sensor or wires have shorted , there is also a secondary valve located und the cover of the intake that should also be checked for shorts that can trigger this code but usually it is the one under the car that goes out 9 out of 10 times it is from fuel being burped into the evap canister or charcoal canister from the gas tank which is caused from overfilling the tank or mid day heat of 90 or better with a full tank
More likely the pump is not putting gas up to the engine's fuel rail.
With key on, not start, the pump should turn on for 2 seconds to put pressure in the line and fuel rail. Do you hear the buzz or hum from the tank with key on?
Did you put a fuel pressure gauge on the fuel rail's test port (shraeder valve), and find no pressure with key on? If so, you will need to check into the pump operation (assuming the fuel filter is not clogged). A quick test is to pull off the gas tank electrical connector, find the fuel pump wire in the connector, and use a test light grounded to a metal frame or a voltmeter. Check for power on the fuel pump wire, while the engine is being cranked over. If power then, your new pump is not working. It could be the ground for the pump, so you need to check that. If no power to pump, engine cranking, then you will have to find the fuel pump relay under the hood, and check the wiring to it. There is also a fuel pump fuse-it may be under hood or in the instrument fuse panel-need to find and check it.
If the pump is working and the fuel filter is clean, you should have gas in the fuel rail (which supplies the injectors with fuel under pressure). I have not heard of a pressure regulator problem that could cause no pressure, but then...
Post back what you find, or with comments. Hope this has helped a little.
TO REMOVE FUEL TANK YOU FIRST RELIEF FUEL PRESSURE.THEN YOU RAISE THE VECHICLE AND SUPPORT ON JACK STANDS.THEN YOU DRAIN FUEL OUT OF FUEL TANK.YOU CAN GO TO ANY AUTO PARTS STORE BUY A SIPHON.DONT SIPHON GASOLINE WITH YOUR MOUTH.SWALLOWING GAS AND FUMES COULD BE FATAL.WHEN ALL FUEL OUT THE FUEL TANK.REMOVE THE FUEL FILLER.DISCONNECT THE ELECTRICAL WIRING TO FUEL TANK.THEN DISCONNECT ALL THE HOSES FROM THE FUEL TANK.PLACE A LARGE FLOOR JACK CENTER OF THE FUEL TANK.PLACE A PIECE PLY WOOD OVER FLOOR JACK LIFTING SADDLE TO KEEP FROM PUTTING A HOLE IN FUEL TANK.START RAISING FLOOR JACK UNTIL SADDLE TOUCH GAS TANK JUST ENOUGH TO HOLD TANK IN PLACE.THEN YOU REMOVE FUEL PUMP SUPPORT STRAP BOLTS DROP FUEL TANK DISCONNECT FUEL SUPPLY AND RETURN HOSES AND DISCONNECT FUEL VAPOR LINES FROM PRESSURE RELIEF ROLLOVER VALVE.THEN REMOVE TANK.IF HAVE TROUBLE REMOVING FILLER TUBE AT GAS TANK SPRAY WD40 AROUND WHERE FILLER TUBE GOES TO GAS TANK LOOSEN THE CLAMPS AND USE LARGE VISE GRIPS WORK FILLER TUBE HOSE AWAY FROM FUEL TANK SPRAY WD40 INTO IT SLIDE ON OFF.WHEN YOU GET FUEL TANK OFF USE A FUEL PUMP MODULE LOCK RING TOOL TURN LOCK RING COUNTERCLOCK WISE.IF YOU DONT HAVE THE FUEL PUMP LOCK RING TOOL.YOU CAN USE A HAMMER AND BRASS DRIFT OR A PLASTIC DRIFT DONT USE NO METAL DRIFTS OR PUNCH YOU WILL MAKE A SPARK AND HAVE EXPLOSION FROM GAS FUMES BE EXTRA CAREFUL.REPLACE FUEL PUMP SOCK AND FUEL SUPPLY LINES IF STOPPED UP AND REPLACE FUEL FILTER.PUT EVERY THING BACK IN VISA VERSA.IF ALL GOES WELL. GO TO AUTO PARTS STORE BUY A GAS CAP WITH A LOCK SO WHO EVER PUT SUGAR IN YOUR GAS WONT BE ABLE TO TRY IT AGAIN GOOD LUCK.
on a dodge neon the fuel pump is in the SIDE of the tank... NOT the top. to remove the pump follow these steps... ******* first unplug battery and remove ******** 1. unbolt passenger side tank strap and lower side of tank. 2. a. if tank is plastic, CAREFULLY unscrew plastic retainer ring but do NOT remove. b. if metal tank, unscrew metal retainer flange but do NOT remove 3. unplug electrical connector and fuel line from pump. move aside. 4. completely remove retainer BE CAREFUL not to disturb pump. 5. have drain pan or wide-shallow bucket available to collect gas. (if tank is full this will need to be able to hold 7-8 gallons) 6. gently twist and pull pump out till gas comes fourth. catch gas in pan/bucket. 7. remove pump when gas stops flowing. 8. install is reverse of removal. 9 BE CAREFUL not to wrinkle gasket or lose gasket into tank when installing or the tank will leak around pump. 10. tighten retainer but DO NOT OVER TIGHTEN. 11. reconnect plug and fuel lines check for leaks. 12. reattach tank strap and fasten 13. refill tank with clean gas. check for leaks. 14. put battery back in. connect battery, start your neon and check for leaks one last time. 15, have fun. this will take about 4hrs to do by yourself with proper tools.
Initially since the fuel pump is located in the gas tank ,it is not a
task for the average home mechanic. It is electric puts out about 15
lbs. pressure uses the gas in the tank as a coolant. In older models it
is possible to have the pump wiring burn and short out.The results could
be a fire or if you are fortunate pump failure.
There are 4 hoses comimg out of the tank that are held on by clamps get
those of then un clamp the filler hose then un screw bolts holding
the tank and it drops right down.
You need to open the tank then you can
put in the new pump witch is 40 dollars make sure its facing the same
way as took it out then you slide it back in close up the tank then
raiseit up put the 4 bolts back in to hold it up the put the 4 hoses
back on were they go tightin the clamps and you are done.
remember you are messing with gas.so no fire,sparks and smoking allowed around car.dissconnect neg. on battery.then relieve fuel pressure by taking off gas cap.take all gas out of tank.undo fuel neck,both straps,hoses and any electrical conectors.take take out from under car.remove any dirt or debri from around fuel pump.there is a locking ring that needs to turn counterclockwise.remove fuel pump and bracket assembly.discard seal.clean pump flange,surface and seal ring groove.apply a light coat of grease to seal to hold in place during install.put seal in ring groove.install fuel pump and bracket carfully to ensure filter dont get damaged.make sure the locating keys are in keyways and seal stays in groove.hold pump in place and install locking ring finger-tight.make sure locking tabs are under the tank lock ring tabs.rotate lock ring clockwise intill it stops fully.put tank back in car.make sure all connections and lines are tight.put only 10gals in tank and check for leaks.put a fuel pressure gauge on the valve on the fuel rail.turn ignition on,but dont start.turn ignition on for 3 seconds then back to off.repeat this 5-10 times or until pressure is at 35psi.if you dont get 35psi or it drops back down check for leaks.if it stays at 35psi then remove fuel pressure gauge and start car.while running check for leaks.this is directly from ford motor co.verbatom.good luck.