Vapor Lock on a 1600 is pretty rare, not impossible, but if your fuel lines are
run correctly, I'd doubt it. I would first check my needle valve that feeds
into the float chamber to make sure you do not have a piece of trash, or more
likely a piece of deteriorating rubber hose, that is intermittently blocking
fuel from entering the float chamber. BTDT. Also since you have installed an
electric fuel pump (I have found the mechanical pump to be quite adequate, and
frankly I prefer it) you need to be sure that it delivers the correct pressure.
May require a pressure regulator (just one extra problem with an electric pump
in addition to the infernal noise). Finally, if you are still using the glass
fuel filter (I think they are pretty neat, and very retro/original) be sure
that your gasket is seated and not sucking air. A little grease or petroleum
jelly will help. Sounds like you are starving the carbs (or one carb).
Good luck in tracing this!
Mike Harper
'66 1600
Charleston SC
--- On Fri, 10/31/08, Steven Burton <pscowboy9@yahoo.com> wrote:
> From: Steven Burton <pscowboy9@yahoo.com>
> Subject: [Roadsters] Fuel system problem
> To: Datsun-roadsters@autox.team.net
> Date: Friday, October 31, 2008, 12:29 AM
> I'm new to the list (well, belonged to it a few years
> ago) and I need some
> help. I've got a 66 SPL that has a fuel problem. both
> SU carbs have been
> rebuild, the mechanical pump has been replaced, I've
> got a new fuel filter and
> my tank, replaced the seal on the gas cap and lines appear
> to be clean,
> however, I'm don't seem to be getting a good supply
> of fuel to the carbs. I'm
> also having an issue with vapor lock for the first time
> since I've owned the
> car.
>
> the car will drive fine for a while then just stall out
> from lack of fuel or
> will vapor lock when I shut off the engine. As you can see
> above, I've gone
> over everything in the fuel system I can think of with no
> luck. This all
> started after doing two projects on the engine. Replacing
> the distributor and
> rebuilding the carbs.
>
> Any suggestions would be greatly appreciated.
>
> Steve
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