Sounds like the Grosjets are gross :)
Do you have any used float needles to put in? I have heard from several MG
members that Grosjets aren't all they're cracked up to be and several people
had problems with them and swapped them out.
I think its the needles as the fuel pump pressure doesn't/shouldn't change.
Sounds like the springs in the needles are weak.
Mike
----- Original Message -----
From: "Dan Neff" <neffster189@yahoo.com>
To: "Roadster Listgroup" <datsun-roadsters@autox.team.net>
Sent: Monday, August 20, 2001 4:58 PM
Subject: float bowl overflow Q
> I am stumped y'all. Any idea's?
>
> Short version:
> All of a sudden my (SU) float bowls started overflowing on high speed
> downhill decelleration (and gagging and sputtering the engine when
resuming
> cruise). I have Ztherapy carbs, and Scott Bruning hasn't a clue. The best
> improvement I've gotten is by putting a fuel line regulator in (with a
> mechanical fuel pump!!?) -- setting it to 2psi eliminates the problem
about
> 95% of the time, but am suspicious it might be leaning it out a hair on
> acceleration (6,000rpm+) - getting intermittent 'bumps' in the
acceleration/-
> power.
> I don't think I've fixed The Problem, just found a workaround. Any
idea's
> what the REAL problem is?
> I'm wondering if the Grosjets could be that touchy about fuel pressure,
> except I'd still want an explanation as to why they worked fine for 11
> months!
>
> Long version:
> [When she gets mad about something...]
> Back around the end of June (I'd already put over 5,000 trouble-free
miles
> on it since a valve/cam job, 10,000 miles since Ztherapy carbs), I seemed
to
> have gotten a bad tank of gas. Sputtering and spitting off and on.
Alternator
> seized 400 miles later.
> What's weird is about that time, I swapped my fuel pump into a 1600 to
> determine if 1600's pump was bad. When I put mine back (and replaced alt,
> checked and re-checked connectors), I started having problems with float
> bowl overflow on low-grade downhill decelleration (usually above 40mph)!
> Did plugs, points, rotor, condenser, cap, swapped an old air filter
> (being unemployed I had to draw the line somewhere), swapped plug wires,
> fuel filter, checked floats and Grosjets, and checked with Ztherapy. still
> having problems.
> Last year, my fuel line gas-tank return reed valve was leaking, so I had
> put a "T" in and run a straight line with a restrictor in it back to the
> tank. It's been fine until now. So when overflow started happening, I
tried
> running without any gas tank return restrictor (leaned it out too much on
> uphill/load). Drilled out restrictor and improved it significantly. Put an
> EI distr'r in, with a 12v coil (which eliminated ballast resistor - a
suspect
> at that point). Nada. 'Borrowed' a reed valve to go back to stock. Problem
> was worse!
> That's when I tried the fuel line regulator. I'm comfortable daily
driving
> it at this point, but wouldn't want to take it on a road trip.
>
> thanks,
>
> Dan Neff '69 2000
> Colorado Springs, CO
> www.wycroc.org
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