Carb Rebuild - Beware!

[stoshzack]

Hi All -

I rebuilt my '70 FJ40 carb a few years ago. It was the first carb that I rebuilt - so I took my time. The 40 has pretty much sat in my driveway for the last few years as I work on restoring it (i.e. I have not been driving it a lot). However, I start it up and run it on a regular basis. Not too long after the carb rebuild, I had significant problems with hesitation on acceleration. I figured I did something wrong in the carb rebuild. Today, I pulled the carb and this is what I found.

As you can see, the o-ring on the accelerator plunger is toast - hence the acceleration issues. Anyone have any ideas how to remedy this problem. I think I read that the original plungers used a leather ring instead of the rubber.

Thanks,
Stoshzack

 

[Brownd3max]

What brand carb kit was this from? Maybe the ethanol in today's gas is to blame.

 

[GA Architect]

Hi All -

I rebuilt my '70 FJ40 carb a few years ago. It was the first carb that I rebuilt - so I took my time. The 40 has pretty much sat in my driveway for the last few years as I work on restoring it (i.e. I have not been driving it a lot). However, I start it up and run it on a regular basis. Not too long after the carb rebuild, I had significant problems with hesitation on acceleration. I figured I did something wrong in the carb rebuild. Today, I pulled the carb and this is what I found.
View attachment 1359427

As you can see, the o-ring on the accelerator plunger is toast - hence the acceleration issues. Anyone have any ideas how to remedy this problem. I think I read that the original plungers used a leather ring instead of the rubber.

Thanks,
Stoshzack

Being that you have your carb apart, you may want to check the fuel solenoid's rubber O-ring to see if it is toasted as well.

 

[FJ40Jim]

That is the rubber plunger from a Keyster kit. Get any other kit, or buy just the plunger from Toyota, and you'll have a leather pump cup.
There is no ICS o-ring on E-74 carbs.

 

[stoshzack]

Thanks guys - yes, it was Keyster. I happened to have a Napa rebuild kit laying around and it in fact has a leather ring.

 

[Landpimp]

OEM leather plungers are now NLA...........

 

[FJ40Jim]

In that case, my parts stash just trebled in value.
I'm rich, Bishes!