bamacooner1591

I checked my oil the other day and noticed it was real thin and smelt like gas, its not my rings, the diaphragm busted in my mechanical fuel pump. I ordered a new one and it came in today. My question is, do all mechanical fuel pumps require the 1/4 inch spacer gasket? Because it notes on the instructions if it doesn't have it, it can overwork itself and cause pump failure. But my older 22r didn't have one on it?

xxxtreme22r

Yes all of them need that spacer. As far as I know anyway.

bamacooner1591

It just has me confused because i had a 1980 4x4 with a 22r with no spacer plate, never had a problem.....

xxxtreme22r

1980 with a 22r? you sure? IIRC I don't think so. 20R yeah but not a 22r. 22r's wern't made till 81.

85gijunk4x4

20r = 1975? to 1980

22r= 1981, 82, 83 and then optional up untill 1995.5

and yes, spacer is pretty much manditory

bamacooner1591

i know 100% it was a 22r..it was converted from a 20r. Are you sure about a spacer being manditory? Cause my 80' model did not have one and ran fine

xxxtreme22r

I am 100% sure now that all need the isolator. Including at least the 79-80 20R.

http://www.utoyot8.com/FullImage.asp...++%2920R%2c22R

23100C INSULATOR, FUEL PUMP
Replaced by: **923-06009 **923-06001 1979.08-1983.07 20R, 22R.. RN3#, 4#





http://www.utoyot8.com/FullImage.asp...308-8808%2922R

23100C INSULATOR, FUEL PUMP
Replaced by: **923-06009 **923-06001 1983.08-1988.08 22R.. RN5#, 6#, 70

bamacooner1591

okay, you made you point lol for some odd reason my old yota didn't have one. but ill be sure to put one on this one

bamacooner1591

also, another question i have..can the fuel return line be blocked off with out any issues?

xxxtreme22r

I woulnd't block it off if running the aisin carb, weber it's ok as long as your running a regulator at 3.5-4 psi. Which is how I have mine set up, however, it does make the fuel pump work more and it also makes it louder. I've been running mine that way for almost 15K now without any issues that I can see.

bamacooner1591

I have the Aisin carb, i guess i'll run it lol im just trying to make this truck as sinple as possible

85gijunk4x4

your old yota was driving on borrowed time....