Thanks to Charley, Jim, & Alan for your replies.
Here's a little more info in answer to your questions & suggestions:
Fuel pump is new
Fuel filter is new
Fuel lines are new (from Doug Reid at 18G)
Distributor is okay - good springs & breaker plate moves freely
The car does run fine when running at a constant rpm on a flat level surface,
but when I give it the gas the sputtering starts. The higher the RPM, the
worse the problem.
I did have the fuel tank cleaned and sloshed with that stuff that's supposed
to coat the inside & seal it from future leaks. I wonder if that wonderstuff
could've clogged the pickup tube? Is it correct that I should be able to see
the fuel filter run dry, or close to it, if that's the problem? Anyone have a
similar experience with a pickup tube getting jammed up with the tank sealer?
Could be a good excuse for a new aluminum tank.
----- Original Message -----
From: Alan Seigrist Blue 100
To: Mick Vander Ploeg
Cc: healeys@autox.team.net
Sent: Monday, August 14, 2006 3:26 PM
Subject: Re: Vapor lock?
Mick -
If your car is running well at slow speeds, it shouldn't be vapor lock.
Usually with vapor lock, the symptoms dissapear when you step on the gas,
because as fresh cold fuel starts getting pumped through the system faster, it
has less opportunity to vaporize.
It sounds to me either:
1) You have a clogged fuel filter or clog in the fuel line somewhere which
is restricting fuel flow
2) Your fuel pump is not pumping enough fuel (maybe it's old?)
3) Your fuel tank's pick up is clogged with rust or some other type of crud
4) Your mechanical advance on the carburettor is not working correctly
(maybe the contact breaker plate is stuck in place or some of the springs are
broken).
Good Luck!
Alan
'52 A90
'53 BN1
'64 BJ8
On 8/14/06, Mick Vander Ploeg <mvanderploeg@nc.rr.com> wrote:
Could someone describe the symptoms of vapor lock? My '57 BN4 has had a
persistent problem of sputtering when under load. Idles fine, revs fine,
but
when given the gas to go up a hill or something, it'll run extremely
rough.
When I say rough, I don't mean rough like when one cylinder is not
firing,
it's more like a very rapid sputtering.
The timing's correct, the mixture's correct (per lifting the piston in SU
method & plug color), valve clearance is fine, no vacuum leaks that I can
find, & I've replaced the distributor cap, ignition wires, coil, plugs,
points, rotor, & condenser. I'm out of ideas. Could it be a vacuum
advance
problem or does it sound like fuel?
The vehicle is 100% stock other than a spin on oil filter, so it has the
original "heat shield" (piece of metal) between carbs and exhaust manifold
&
has fuel pump located above exhaust pipe.
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