replacing a 3-out fuel sending unit with a 4-out one, got a ?

[mofugly13]

I went to pick-n-pull today and tried to find a sending unit for a 31 gallon tank I am swapping into my K5, in place of the 25 gallon tank I took out. I could only find one with four outlets, where my original one had only three. I am guessing the fourth outlet is for the return line that comes from fuel pumps with three ports. Is it ok for me to just cap off this fourth outlet and install it in place of the three out one? It seems like it would be fine, but I figured I better ask, just in case there will be problems if I did it.

 

[dyeager535]

Was one of them a *large* diameter, something like 5/8"?

I just can't recall if the sender has the fill vent fitting on it.

SHOULD have a fuel out, fuel return, EVAP, then the fill vent line if I'm thinking correctly.

EVAP and the return CAN be plugged if you aren't running them, but you need to vent the tank somehow. Using the EVAP fitting for vent (somehow, gas filter on end of the hose, etc) is typically how people do it.

 

[mofugly13]

Yeah, one is large, like 5/8" or so. I plan on hooking up the EVAP vent to the same hose as theEVAP vent on the old sender. I was just checking to see if it was OK to cap off the fuel return line and call it good.

 

[dyeager535]

Yes, but I would use something like hose with a bolt or something, as ghetto as that sounds. I don't trust nor use those plastic or rubber caps, they deteriorate quickly and blow off when there is pressure.

Heck you could probably solder or braze it shut.

 

[mofugly13]

Thanks, I'll probably do like you said and use a hose and bolt. Maybe one day I'll run a return line down the frame, as my spare fuel pump had three ports, on for the return. When I had that one on my old 327, I used a hose and bolt to cap it off. I think I still have that piece of hose with the bolt still in it around here somewhere...