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  1. #1
    I'm Awesome 1BadBowtie's Avatar
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    Default 98 GMC Sierra Fuel Pump Replacement

    I am looking to replace my fuel pump soon. I can hear it surging in and out while running at constant throttle, it is also 15 years old. Any recommendation of brand of pumps, install tips etc.


    98 Sierra. New crate motor, DIC, K&N,
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  2. #2
    I'm Awesome 1993GMCSierra's Avatar
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    AC Delco or Delphi.

    Get anything else, and you'll be doing it again, sooner than later.


    Put a NAPA one in my old Caprice (350, TBI), was on #3 when I sold it a year after the initial replacement. I used to keep a rubber mallet in the trunk to get me home in case.
    1993 GMC Sierra K1500 SLE - 130,023 miles
    2002 Lincoln Town Car Cartier Edition - 73,308 miles
    1993 GMC Sierra C2500 SL - 254,177 miles - sold!
    1995 Chevrolet Caprice Classic - 157,326 miles -sold!

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    I'm Awesome 1993GMCSierra's Avatar
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    As far as install tips, people either drain and drop the tank, remove the bed, or cut a 12"x12" hole in the bed and make it into an access door.


    When the time comes for me, if I have a lot of gas in the tank, I'll remove the bed. Otherwise, drop the tank.
    1993 GMC Sierra K1500 SLE - 130,023 miles
    2002 Lincoln Town Car Cartier Edition - 73,308 miles
    1993 GMC Sierra C2500 SL - 254,177 miles - sold!
    1995 Chevrolet Caprice Classic - 157,326 miles -sold!

  4. #4
    8 Lug Hoarder volunteerff21's Avatar
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    Your going to get a lot of different opinions on remove bed vs drop the tank. Dropping the tank is easier IMO. Did mine by myself and it only took about 2 hours.

    If you do choose to drop the tank make sure it's as close to empty as you can get it. You'd be amazed how much fuel weighs lol.

    And remember that PB Blaster is gonna be your friend
    98' GMC K2500 ECSB, 7.4L, 4L80E, K&N, 11 Blade Fan, GM HD Ignition Box, 2" B&C, Rancho Shocks, Tow Mirrors, B&M Shift Improver (The work truck)

    94' C1500 RCLB, 4.3L, 4L60E, TBI Mods Stage 1, TB Spacer, K&N Filter, 2" lift. (The forever project)



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    94' C2500 ECLB: Sold it back to Grandpa
    96' K2500 ECLB: Killed by electrical gremlins. (Future mud truck)

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    I'm Awesome 1BadBowtie's Avatar
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    Did you have to replace the brackets when you put it back in place?


    98 Sierra. New crate motor, DIC, K&N,
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    I'm Awesome Mean Green's Avatar
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    I personally think it's easiest to unbolt the bed and slide it back a few feet. An impact and a 18mm socket make quick work of removing the bolts that fasten the bed to the frame, and doesn't take long to do at all.

    As for brand, as mentioned above; AC Delco or Delphi is the only way to go. Other tips, be sure not to bend the float or your gauge will not be accurate. Sand down the grounding point for the pump on the frame for a low resistance connection, and keep er' above a half tank after you replace it!
    Baron

    1994 GMC SLE K2500 4X4 ECSB
    350 / 4L60E/ 14 bolt SF / 3.73 / Kicker Audio / Cherry bomb / AR Wheels / KL-78's / HID's / LED's

    1967 Chevy C/10 Custom - shortbox, 327 W/ 3 on the tree
    1949 Chevy 1/2 - Stretched cab, shortbox, 350/T5
    1991 Chevy K1500 ECSB 4X4 700R4
    1987 Chevrolet Camaro Z28 305/700R4

    88-98 Chevy & GMC Heavy Duty Headlight Relay Harness's For Sale HERE

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    8 Lug Hoarder volunteerff21's Avatar
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    On my current 96' no, but on my old 94' yes. They were so rusted I'm surprised the tank didn't fall out.

    As long as they are in good shape you should be able to re-use them.
    98' GMC K2500 ECSB, 7.4L, 4L80E, K&N, 11 Blade Fan, GM HD Ignition Box, 2" B&C, Rancho Shocks, Tow Mirrors, B&M Shift Improver (The work truck)

    94' C1500 RCLB, 4.3L, 4L60E, TBI Mods Stage 1, TB Spacer, K&N Filter, 2" lift. (The forever project)



    OLD
    94' C2500 ECLB: Sold it back to Grandpa
    96' K2500 ECLB: Killed by electrical gremlins. (Future mud truck)

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    8 Lug Hoarder volunteerff21's Avatar
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    One other install tip, if your planning on re-using the sending unit be extra careful on the fittings for the fuel lines. Soak them in PB Blaster and don't wrench on them too hard or you'll end up snapping the line.
    98' GMC K2500 ECSB, 7.4L, 4L80E, K&N, 11 Blade Fan, GM HD Ignition Box, 2" B&C, Rancho Shocks, Tow Mirrors, B&M Shift Improver (The work truck)

    94' C1500 RCLB, 4.3L, 4L60E, TBI Mods Stage 1, TB Spacer, K&N Filter, 2" lift. (The forever project)



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    94' C2500 ECLB: Sold it back to Grandpa
    96' K2500 ECLB: Killed by electrical gremlins. (Future mud truck)

  9. #9
    I'm Awesome Mean Green's Avatar
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    Quote Originally Posted by volunteerff21 View Post
    One other install tip, if your planning on re-using the sending unit be extra careful on the fittings for the fuel lines. Soak them in PB Blaster and don't wrench on them too hard or you'll end up snapping the line.
    On the 96-98 Vortec equiped trucks, the fuel sending unit and pump are one unit. If one goes bad you have to replace both. But on the 88-95 TBI trucks, that is a very good point. The lines coming out of the tank are often pretty brittle, and won't take much force to twist off or brake a line.
    Baron

    1994 GMC SLE K2500 4X4 ECSB
    350 / 4L60E/ 14 bolt SF / 3.73 / Kicker Audio / Cherry bomb / AR Wheels / KL-78's / HID's / LED's

    1967 Chevy C/10 Custom - shortbox, 327 W/ 3 on the tree
    1949 Chevy 1/2 - Stretched cab, shortbox, 350/T5
    1991 Chevy K1500 ECSB 4X4 700R4
    1987 Chevrolet Camaro Z28 305/700R4

    88-98 Chevy & GMC Heavy Duty Headlight Relay Harness's For Sale HERE

  10. #10
    8 Lug Hoarder volunteerff21's Avatar
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    Quote Originally Posted by Mean Green View Post
    On the 96-98 Vortec equiped trucks, the fuel sending unit and pump are one unit. If one goes bad you have to replace both. But on the 88-95 TBI trucks, that is a very good point. The lines coming out of the tank are often pretty brittle, and won't take much force to twist off or brake a line.
    You can replace just the pump, its just two plastic clamps that hold it into the sending unit IIRC. That's all I was going to do on mine until one of the lines snapped and then I had to go buy the sending unit minus a pump. Not trying to argue just telling you what I went through when I did mine. Unless the 96' differs from the later years for some reason.......
    98' GMC K2500 ECSB, 7.4L, 4L80E, K&N, 11 Blade Fan, GM HD Ignition Box, 2" B&C, Rancho Shocks, Tow Mirrors, B&M Shift Improver (The work truck)

    94' C1500 RCLB, 4.3L, 4L60E, TBI Mods Stage 1, TB Spacer, K&N Filter, 2" lift. (The forever project)



    OLD
    94' C2500 ECLB: Sold it back to Grandpa
    96' K2500 ECLB: Killed by electrical gremlins. (Future mud truck)

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