Author Topic: Fuel Sender Question  (Read 1823 times)

Offline Tilleyman

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Fuel Sender Question
« on: October 12, 2020, 03:49:59 PM »
I have a '81 C10 shortbed with a H code 305. I need to replace my fuel sender but can't find anywhere whether it's a 2 outlet or 3.  I'd like to buy the new sender before I drop the tank and render my truck undriveable until a new sender arrives. Any input would be greatly appreciated.

Offline VileZambonie

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Re: Fuel Sender Question
« Reply #1 on: October 12, 2020, 04:18:16 PM »
All you have to do is look. You can see it behind the cab.
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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline Bronze Knight

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Re: Fuel Sender Question
« Reply #2 on: October 12, 2020, 07:15:12 PM »
You can get the three outlet one and just cap it off with hose with a bolt in it or a rubber Vacuum end cap.

There is the send/pickup tube a return line and a vapor/emissions line. Depending on where you buy it the two outlet sender may be more expensive! The vapor/emissions tube is very short ends just inside the tank.
1985 Crew Cab, 454, TH350, NP205
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Offline Mike81K10

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Re: Fuel Sender Question
« Reply #3 on: October 12, 2020, 07:26:08 PM »
I have an 81 K10 with duel 16 gal tanks and have 3 hose connections on the fuel sending units. Supply, return, and vent!
« Last Edit: October 16, 2020, 10:37:52 AM by Mike81K10 »
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Offline Tilleyman

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Re: Fuel Sender Question
« Reply #4 on: October 15, 2020, 03:39:52 PM »
Thanks. It sounds like if I go with the 3 outlet I'm safe, because as you say, I can plug it if I have to. If I get a 2 outlet and need a 3 then I'm sunk.

Online bd

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Re: Fuel Sender Question
« Reply #5 on: October 15, 2020, 04:13:43 PM »
WOW!  How many fuel lines connect to the fuel pump?
Rich
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In other words... if people learn by making mistakes, by now I should know just about everything!!!
87 R10 Silverado Fleetside 355 MPFI 700R4 3.42 Locker (aka Rusty, aka Mater)

Offline Mike81K10

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Re: Fuel Sender Question
« Reply #6 on: October 16, 2020, 10:23:44 AM »
Three hose connections on the tanks fuel sending unit (I should not have said three outlets - corrected), there is only one fuel supply (outlet), a return, and a vent (outlet) needed. I would imagine you have two hose connections on the fuel pump (a supply and a return coming from the selector valve) and a threaded connection where a line connects that goes to the carburetor if it is like my 81 K10. I attached a pic of my fuel tank selector valve, a little dirty (the pic is prior to my rebuild and is OEM). Wish the same Selector valve could still be found, new selector valves are shorter in length and have a little different design.
« Last Edit: October 16, 2020, 10:47:30 AM by Mike81K10 »
"Tell me and I forget. Teach me and I remember. Involve me and I learn." -Benjamin Franklin