Topic: Embarrassing Carburetor Question

[Cavu2usf]

Embarrassing because I should know (at least should have labeled on removal).

Is this the fuel flow feed FROM the Fuel Pump.....


 ... and this the fuel flow feed back TO the Fuel Pump?


 

Thanks.
Steve

[toe]

What hose fits what nipple?

[Gnarly4X]

Embarrassing because I should know (at least should have labeled on removal).

That’s a very pretty carb!

“He who doesth not labeleth while removeth thy engine, shall be label-leth and suffer embarrathment.”

~ Gnarls 

[Cavu2usf [OP]]

“He who doesth not labeleth while removeth thy engine, shall be label-leth and suffer embarrathment.”

~ Gnarls 

 
Very true.

[H8PVMNT]

First of all I need to know what truck this is on, what year, etc...  Are you running a mechanical or electric fuel pump?

I went out and looked at both trucks on my place with 20r carbs and neither of them have that second fitting.  The one with the hex head is in fact your supply, you are correct.  On all mine the return line is from the return on the mechanical fuel pump and the return never reaches the carb at all.

If this is a '79 with an electric fuel pump that may be how they do the return.  I haven't seen one like that myself. 

That second fitting does however look like a thing that vents vapors from the float bowl on a 22r carb and just goes to a charcoal canister.

[Cavu2usf [OP]]

Thanks for the reply. 

Yes, I never mentioned it.     This carb is on an '80 4X4 (RN47) with a 20R. It's a Mechanical Pump with 3 connections to it.



Something tells me California Smog has something to do with it.

Appreciate your time. 

Steve

[H8PVMNT]

OK your fuel return is there on the fuel pump so that second tube is definitely something to vent vapors from the float bowl.  Hook it to a charcoal canister and wheel on .

[Cavu2usf [OP]]

 
Thanks much!

Steve