datsun-roadsters
[Top] [All Lists]

Re: float bowl overflow Q

To: twalter@austin.rr.com
Subject: Re: float bowl overflow Q
From: Dan Neff <neffster189@yahoo.com>
Date: Mon, 20 Aug 2001 22:04:15 -0600
Thanks for all the pointers!   

Thomas Walter wrote:
> Are BOTH carbs suddenly running rich? Or just one?
> The spark plugs will tell the tale.

Originally just one (front), then after several troubleshooting efforts,
both do it equally. 
 
> By any chance did you replace the overflow tubes recently? 

No. Well, I have about 3" tubes, and thought if I'm pouring gas all over
the place, I'll run long ones into the wheel well. I was already advised
against that, so put the 3"ers back. 

> How old are your floats? 

Came with the carbs - I assume 1 yr old. 

> The replacement items are the black plastic type. 

they are. 

> Still wondering if some fuel treatments/additives might make them take
> on "gas" sooner. If they are heavier, the fuel level will increase, too. 
> Also might explain the need for the pressure regulator.

I had never put any fuel additive in until after all this started. 

> FUEL PUMP SWAP... any chance you left out the spacer
> between the pump and block? If so, the fuel pressure
> goes sky high! (3 psi is normal, suddenly you see
> 15 psi!).

Well, THAT makes sense (Daryl Smith pointed this out too), but I'm sure
I checked! Surely I would've noticed the spacer on the garage floor!!
I just re-checked. There are what look like 2 pieces, comprising about 
7/16" thickness. I'm _pretty sure_ the only difference is I tore the 
old gasket, so made a new one - it's gotta be w/in a 1/32" of the same 
thickness. Does that sound right? 
Maybe I'll have someone ELSE check. 
 
> Oh, when Pat Horne suddenly had problems with his
> carb running too rich, I had joking suggested the
> only thing left to check was for a muddobber (wasp
> common in these parts) building in the overflow
> tube. Uh, pure luck on my guess... but couldn't
> figure anything else out!

Ok. 1) Will check for muddobbers  :) , 2) have someone else check my 
pump spacers, then 3) go for a lid swap (thanks Victor Laury and 
datsunmike), or at least back to stock jet.

thanks all!
dan neff    '69 2000
colorado springs, co
www.wycroc.org

<Prev in Thread] Current Thread [Next in Thread>