NO dont drop tank, you will be sorry, take bed off, only like 6 or 8 bolts, and you will have more room to work, and its a pain in the *** to undo the lines and drop the tank, you cant get in there to do it, but just basic tools nothing special, be sure and try not to make any sparks while takein off that ring to get the pump out, and put an ac delco pump on there
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replacing the fuel pump on this truck, requires the fuel tank to be removed. the fuel pump is installed in the fuel tank. you can either drop the fuel tank or remove the truck bed to gain access to the fuel pump
you need to go get a manual on this at your local parts store(haynes #24065)this is not a real big job to do,i have put one in my truck this manual breaks it down very good,i orderd my stuff from partsgeek.com saved a lot of money with them,i would advise you to change the whole unit,pump and sending unit,i went cheap and only replaced the fuel pump,well a month later the sending unit went out so i had to drop the tank again to put a new sending unit in it..
I don't think there is enought slack to drop the tank without unhooking the lines. You can take this advise if you want or not its up to you, but i always found it easier to unbolt the bed and lift it back about a foot and i could get right at the sender where the pump is and in some cases i dident even have to unhook the fuel lines, pull the sending unit out chg. the pump and put it back together. Or you can do it the other way, unhook the lines, electrical wires, filler hose, and straps, if its got gas in it better have some help 8# a gal. adds up.
the fuel tank will need to be removed. Put truck on jack stands..disconnect battery...loosen straps holding tank and lower enough to disconnconnect fuel lines and wiring connectors...you will need a special tool to disconnect the fuel lines....the sending unit and fuel pump assembly is held in by a big lock ring....rotate the ring and it will then lift off...remove the pump/sender assy....remember to replace the fuel pump strainer...this would be alot easier with pictures to show you..li would suggest buying a book at like autozone..
when mine went bad I pulled the bed off and moved it back enough toget to the top of the fuel tank it was easier to remove and replace versus dropping the tank tookme and my buddy about 2 hours rig a sling and use a cherry picker to lift bed don't forget to unplug wire harness hope this helps