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Was fuel smell present before you had fuel pump replaced? If yes I would sugest you drop tank and see if fuel vent hose is plugged forcing fuel back pressure line to vent through cap. If fuel smell was not present before you replaced fuel pump and seal. I would suggest you drop tank back out and check all fittings and hose conections. also if you still have old sending unit you could check to make sure they are exactly the same. As Sometimes you have to pull relief valve from old sending unit and install it in the new one, as some sending units wont have one in it. and some will have one that is regulated at a different fuel pressure. hope this helps Vic
First, using a scan tool activate the vent solenoid, sealing the system. Then monitor the fuel tank pressure (FTP) sensor. If the system is sealing properly, the number will stay consistent. If is isn't, the pressure sensor will show that as well. If the system slowly leaks, use a smoke machine and watch for smoke exiting the system at any EVAP component. Any where there is smoke exiting the system, that is the faulty component. Do not pressurize the EVAP system with air pressure. Doing so can damage the purge and vent solenoids in the system.
This diagnosis detects leaks in the Evaporative Emission (EVAP) purge
line using of vapor pressure in the fuel tank. The EVAP canister vent
control valve is closed to shut the EVAP purge line. The vacuum cut
valve bypass valve will then be opened to clear the line between the
fuel tank and the EVAP canister purge volume control solenoid valve. The
EVAP control system pressure sensor can now monitor the pressure inside
the fuel tank. If pressure increases, the Engine Control Module (ECM)
will check for leaks in the line between the vacuum cut valve and EVAP
canister purge volume control solenoid valve.
Possible causes - Incorrect fuel tank vacuum relief valve - Incorrect fuel filler cap used - Fuel filler cap remains open or fails to close - Foreign matter caught in fuel filler cap - Leak is in line between intake manifold and EVAP canister purge volume control solenoid valve - Foreign matter caught in EVAP canister vent control valve - EVAP canister or fuel tank leaks - EVAP purge line (pipe and rubber tube) leaks - EVAP purge line rubber tube bent - Blocked or bent rubber tube to EVAP control system pressure sensor - Loose or disconnected rubber tube - EVAP canister vent control valve and the circuit - O-ring of EVAP canister vent control valve is missing or damaged - EVAP canister is saturated with water - EVAP control system pressure sensor - Absolute pressure sensor
Possible solution - Loose fuel filler cap - Leaking fuel filler cap
Check this procedure to REMOVAL & INSTALLATION (see Figures 1, 2 and 3 / click over pics for zoom)
Fig. 1: Remove the nuts retaining the access cover in the trunk
Fig. 2: Once the cover is removed, access to the pump is obtained
Fig. 3: Note the alignment marks must be met to install the pump correctly
An electric fuel pump is used with fuel injection systems in
order to provide higher and more uniform fuel pressures. It is located
in the tank. To perform the testing or servicing, you will need a DRB
III or equivalent scan tool.
Release the fuel system pressure.
Disconnect the negative battery cable.
Open the trunk lid, then remove the trunk liner.
Remove the access panel fasteners.
Remove the access panel and gasket. Inspect the gasket for damage. If necessary, replace the gasket.
Disconnect the electrical wiring from the top of the pump module.
Disconnect the fuel supply and return tubes from the fuel pump module.
Disconnect the hose from the pressure relief/rollover valve.
A band clamp fastens the pump module to the tank. The module rises up from the tank after loosening the clamp.
Loosen the band clamp until the pump module rises up from the tank.
The pump reservoir may contain fuel. Do not spill fuel while removing the module.
To absorb any possible spillage, place a shop towel around the
access opening. Without removing the modular, tip it backwards to allow
fuel in the reservoir to run down the side and back into the tank.
The float arm of the sensor catches on the inside of the tank
while removing the module. Tilt the module to the one side when removing
it from the tank.
Remove the pump module and gasket from the tank.
Drain the remainder of fuel from the reservoir before servicing the pump module.
The fuel pump module and tank have alignment marks. The tank has two
molded lines at the ten o'clock position. The fuel pump has a triangular
alignment mark. Align the marks to correctly position the pump.
With a new gasket, insert the pump straight into the tank to set the float on the bottom. Align the marks on the pump and tank.
Seat the pump to tank by pushing the top downward. Make sure the
gasket does not slip over the outside or inside edge of the tank lip.
While holding the pump in the seated position, place the band clamp over
the lip of the tank and edge of the pump. Tighten the band clamp to 31
inch lbs. (4 Nm). Do not over tighten.
Install the fuel tubes over the return and supply nipples on the module.
Connect the vent line to the pressure relief/rollover valve.
Attach the electrical wiring to the pump.
Using a DRB III or equivalent scan tool, pressurize the fuel system.
Check for leaks.
Install the access cover and gasket. Tighten the fasteners.
The fuel pump is located inside the fuel tank. You can access the fuel tank thru the trunk. Inside the trunk and underneath the carpet, there is a access panel. Remove the five screws and lift the access panel. There under the panel you will see the pump. Disconnect it and take it to the auto parts store as they usually want the old one for an exchange. Joe
According to the instructions, it is not accessible through the trunk on the 94 Cadillac
REMOVAL AND INSTALLATION
Fig. 1: Fuel pump unit
Disconnect the negative battery cable.
Relieve fuel system pressure.
Remove fuel filler cap to release fuel tank vapors. Leave cap off until repairs are completed. Gasoline fuel vapors are extremely flammable. Ensure that fuel is stored in a container that can be properly sealed. Never store fuel in an open container. Store container in a safe place away from heat.
Remove fuel tank by performing the following:
Step 1: Drain fuel from the tank into an approved container for storage.
Step 2: Raise and safely support the vehicle.
Step 3: Remove rear stabilizer bar at links, pivot bar downward.
Step 4: Remove hoses and pipes from tank unit.
Step 5: Remove hoses at tank from filler and vent pipe.
Step 6: Disconnect tank unit harness from rear body harness.
Step 7: Support fuel tank and disconnect 2 fuel tank retaining straps.
Step 8: Remove tank from vehicle.
Remove sending unit, gasket and pump assembly by turning cam lock ring counterclockwise. Lift assembly from fuel tank and remove fuel pump from fuel tank sending unit.
Pull fuel pump up into attaching hose while pulling outward away from bottom support. Take care to prevent damage to rubber insulator and strainer during removal. After pump assembly is clear of bottom support, pull pump assembly out of rubber connector for removal.
Push fuel pump assembly into attaching hose.
Install fuel tank sending unit and pump assembly into tank assembly. Use new O-ring seal during reassembly.
Install cam lock over assembly and lock by turning clockwise.
Support tank and position in vehicle. Install tank straps and secure with retaining bolts. Tighten to 25 ft. lbs. (33 Nm).
Connect tank unit harness to body harness.
Connect hoses to filler and vent pipes. Tighten clamps.
Connect hoses and pipes to tank unit.
Connect rear stabilizer bar to links. Tighten bolts to 42 ft. lbs. (58 Nm).
First you should check your trunk. some newer chevy's have an access pannel uner the trunk liner inside the trunk. you remove the liner, remove the bolts and panel, and the pump is right there. it may take some effort to get it wiggled through, but trust me, it will fit. you must remove the fuel lines and wire harness first, then remove the lock ring completely before attempting to pull the pump through the access hole. if that fails then you need to drop you fuel tank to access the pump. there are instructions for removal and installation of the tank below.
REMOVAL & INSTALLATION
Disconnect the negative battery cable.
Drain the fuel tank, using a hand-operated pump device to drain as much fuel through the filler tube as possible.
Fig. View of fuel tank mounting
Fig. The fuel filler pipe is attached to the body with a bracket and retaining bolt
Fig. The fuel filler pipe is attach to the tank by a hose clamp
Raise and safely support the vehicle.
Unfasten the muffler hanger bolts.
Remove the rubber exhaust hangers, then allow the exhaust system to rest on the rear axle.
Disconnect the hoses from the fuel tank sender. Grasp the filter and one nylon fuel connection line fitting. Twist the quick-connect fitting 1 / 4 turn in each direction to loosen any dirt within the fitting. Repeat for the other fitting. Using compressed air, blow out the dirt from the quick-connect fittings at the end of the fuel filter.
Detach the quick-connect fittings by pulling the release tabs back on the fuel line quick connector and pulling apart.
Disconnect the hoses at the tank from the filler, vent and vapor pipes.
With the help of an assistant, support the fuel tank, then disconnect the two tank retaining straps and carefully lower the tank.
Detach the fuel sender electrical connector.
Unplug the fuel pressure sensor connector.
Remove the fuel tank from the vehicle.
If the tank is being replaced, perform the following:
Remove the sound insulators.
Remove the modular fuel pump/sender assembly, as outlined earlier in this section.
Inspect all connectors for dirt and burrs. Clean or replace, as required. Inspect the fuel line O-rings for cuts, nicks, swelling and/or distortion and replace as necessary.
Install the fuel sender assembly to the new tank, as outlined earlier in this section.
Install the sound insulators.
With the help of an assistant, raise the fuel tank to the vehicle and attach the fuel sender connector and, if equipped, the fuel pressure sensor connector.
Raise the fuel tank into position then fasten the retaining straps. Tighten the retaining bolts to 26 ft. lbs. (35 Nm).
Connect the hoses to the filler, vent and vapor pipes.
Attach the nylon fuel feed and return connecting line quick-connect fittings to the fuel sender, as follows:
Apply a few drops of clean engine oil to the male connector tube ends.
Push the connectors together to cause the retaining tabs/fingers to snap into place.
Once installed, pull on both ends of each connection to be sure they are secure.
Install the rubber exhaust hangers.
Install the muffler hanger bolts, then tighten to 11 ft. lbs. (15 Nm).
Attach the fuel tank sender electrical connector.
Carefully lower the vehicle.
Refill the fuel tank, then connect the negative battery cable.
Turn the ignition to the ON position for two seconds, then turn it to the OFF position for ten seconds. Turn again to the ON position and check for fuel leaks.