Fuel pump on 1987 GMC 2500 HD with throttle body

[Matt Noll]

So I am new to this but not GM trucks but this is first for me. I am going through this after 20 yrs of it sitting on my farm, pulled the bed and found the top of the gas tank rotted out, so I ordered a new tank. Pulled the sending unit out of the old tank and was a little surprised when it came right out with no plug for a fuel pump. So I thought while I am at it I will add a second tank, so I order the passenger side tank for said truck with a new sending unit. This sending came with a plug hanging off of it for fuel pump. So now I start scratching head and crawl underneath the truck and trace the original fuel lines from the original position left side tank up the frame rail and right I to the TB. No fuel pump in the tank and none externally. So tell me how can that be? Anyone? Thanks much!!

 

[Bextreme04]

So I am new to this but not GM trucks but this is first for me. I am going through this after 20 yrs of it sitting on my farm, pulled the bed and found the top of the gas tank rotted out, so I ordered a new tank. Pulled the sending unit out of the old tank and was a little surprised when it came right out with no plug for a fuel pump. So I thought while I am at it I will add a second tank, so I order the passenger side tank for said truck with a new sending unit. This sending came with a plug hanging off of it for fuel pump. So now I start scratching head and crawl underneath the truck and trace the original fuel lines from the original position left side tank up the frame rail and right I to the TB. No fuel pump in the tank and none externally. So tell me how can that be? Anyone? Thanks much!!

Did the tank have a baffle? Maybe at some point someone stole the sending unit and pump for something else? I think the lines are identical for 87 and earlier, it's only the blazer ones that went to the saginaw style fuel line connectors and all hard line.

 

[Matt Noll]

Thanks for the reply, after posting I did a lookup of the fuel pump for this truck and realized it is incorporated into the sending unit which didn't even notice when I pulled it from the old tank and put it in the new one. Not sure why the new sending unit didn't come with a pump but I think I am hot on the trail. Thx again and yes the old tank had a baffle in it.