There is no access from under the back seat on your particular model. You are going to have to drop the gas tank to get to it. The nice thing is that the Honda's come with a fuel drain which you will see when you get under there. Drain the fuel and then you will have to drop the tank and have somebod hold the tank while you get up into the fuel pump area. The problem is probably not your fuel pump though, they do not go bad very often on these cars. I thought mine was bad until I hooked up direct power from the battery and it worked. Try replacing the main relay under the driver's side dash it is underneath a silver box which controls your cruise control. The relay will say MAIN with 12V underneat it. It is brown and grey. Hope this helps
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The fuel pump is built into the gas tank usually if u pull up the trunk carpet or pull up the bottom part of the back seat you will see a 10" disc with bolts around the edge. This is the fuel pump access cover. The fuel pump is under there.
The fuel pump is probably located at the fuel tank. You will find the fuel pump mounted on the top of the fuel tank. There will be an access cover, about the size of a saucer, glued down with caulk under the trunk carpet just behind the back seat, or under the back seat bottom. Once you have located this cover, pry it up--I don't think there will be any screws. You should then be able to unscrew the plate from the top of the tank which will lift the fuel pump and sender unit. PLEASE OBSERVE EVERY PRUDENT PRECAUTION FOR WORKING AROUND FLAMMABLE VAPORS AND LIQUIDS! EVEN IF THE TANK IS EMPTY! THE FUEL PUMP IS INSIDE THE GAS TANK. GOT TO DROP THE GAS TANK TO CHANGE IT.
91, 92 and 93 Honda accord sedans have a tank access hatch which allows you to remove the sending unit with out dropping the tank. It is located under the trunk carpet behind the drop foward rear seat back. on the passanger side.
I suggest the battery be disconnected before you attempt this. If you have a factory equipt radio, you will need your code to reset it after reconnecting the battery.
Tools needed brass punch (to prevent sparks and explosions from the striling hammer), hammer, phillips screw driver toothe brush or equivilent cleaning brush..
I opened all doors and trunk for ventilation. Put the rear seat back down. The trunck carpet folds foward to the front of the car. You should be able see the access hatch with three phillips head screws. Remove the screws and lift te hatch carefully not to dammage the wire harness. Remove the wire harness fron the sending unit. Pull rubber protector back to expose the harness connecter. Clean this area good with the brush. Dirt in the tank will cause other preformance issues with your vehicle. With the brass punch rotate the locking ring 1/3 of a turn to allow it to dissengage it. lift the locking ring out and place aside. Lift the sending unit while twisting it getly counter closkwise 1/4 of a turn. gentlh minipulate the sending unit out of the tank by assisting the float thru the opening. Replace in reverse order.
On the firewall underneath the vacuum control box. Thats just to the left of the throttle body, behind the black air intake hose.
The website below shows how to find and change the fuel filter on a 93 Honda Accord: