On Mon, 18 Jun 2007 15:18:42 GMT, "Private" >
wrote:

>
>"Bruce Bass" > wrote in message
>news:_q2dnWjvg4UlDujbnZ2dnUVZ_qOpnZ2d@metrocastca blevision.com...
>> I've just moved to N.E Pennsylvania, ( Berwick ) and am in need of someone
>> who is familiar with 1965 Rochester Fuel Injection. I had the unit
>> "rebuilt" by Jack Podell ($1500.00 ) about a year ago and just recently
>> re-installed it on my car. It used to run just fine until the seals began
>> to leak gas due to using 104 octane Sunoco racing fuel. ( Not a good idea
>> according to Podell ). Now it seems to surge and /or buck when cruising at
>> a steady speed or under moderate acceleration. It seems to run OK under
>> hard acceleration. I've been using premium unleaded with Podell supplied
>> lead additive/octane booster. Any help would greatly be appreciated.
>> Thanks.
>>
>> P.S. Are there any Corvette Clubs in this neck of the woods ?
>> Thanks again.
>
>IMHE most fuel suspected drivability problems are caused by faulty ignition.
>I suggest you use a good distributor testing machine to check the advance
>curve and particularly for any sign of sticking or jumping advance weights
>or vacuum advance. New distributor bearings may be required. This is not
>an expensive or difficult system check and satisfies the rule of checking
>the easy stuff first.
>
>Good luck YMMV
>


When I raced my 1964, had 65 FI, the biggest problem was wear on the
pivot holes on the diapham attachment. there was a standard and heavy
duty diaphram assy from Chevy, but do not remember the differences and
part numbers would mean little these days. The Die cast units ran
rich when the diapham screwed up while the sand cast units ran lean.
Die cast controlled the return line and the sand cast metered the feed
line to the injectors.