The smell of fuel is a clue.
I believe that the SU are very sensitive to fuel
pressure, ~3 psi is recommmended ISTR.
Try this:
1) Install new (or *clean used*) set of plugs
2) Warm up the car by driving around, carefully so as
not to have the problem occur.
3) Bring your tools, find a clear open space to test.
4) Drive the car to create the problem, but as soon as
it happens, cut the ignition.
5) Pull over, pull the plugs, look for rich/lean.
6) Look for evidence of fuel bowl overflow.
Also check vacuum line attachment, etc.
Good luck!
Carter
--- Chris Sharp <sharpc@interaxs.net> wrote:
>
> Howdy--
>
> Here's one for all y'all SU experts out there.
>
> A neighbor of mine and his teenage son both have mid
> 70's Datsuns. They've
> swapped the original engine (1300 I think) for the
> larger (1500?) Datsun
> engines. They are both using the stock Datsun
> ignition. Recently, they
> converted them both to SU HS-2 carbs using a special
> manifold made for this
> application. Now they both have developed the same
> problem: the engine
> cuts out abruptly above 5000 RPM with a strong
> gasoline smell, cuts back in
> by lifting off of the accelerator. The best way to
> describe it is like
> disconnecting the ignition. But since neither car
> had this problem before
> the carb swap, the SU's are being eyed with a great
> deal of suspicion.
>
> Knowing I have SU's on my Spit, they drew me into
> the conversation. I'm
> half-way decent with a wrench but this one's got me
> stumped. Any ideas?
>
> Chris
>
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