[DeTomaso] Holley 650 problem

[Will Kooiman]

Most likely you had a small piece of debris in the needle/seat.

Normally when this happens the debris prevents the needle from seating, so
gas continues to fill the fuel bowl and it has to go somewhere.  That
somewhere is through the jets and out the boosters - or out the vent tube.

It has happened to me several times.  I normally remove the needle seat,
check it for debris, and reinsert it.  It's probably better to take the fuel
bowl off and clean it out, but I've never done that, and it has always
worked fine.

To remove the needle/seat, you just unscrew it all the way, be careful, take
a look to see if it is clean.  If it is, screw it back in.  If it isn't, you
can either clean it out and screw it back in, or you can replace it.

If you are lucky, when you screw it back in, you do not need to readjust
your float.  I've done this before by using only the 9/16 (or is it 5/8?)
nut.  Do not loosen the common screw driver screw.  If you unscrew the
common screw, you are changing the float adjustment.  It sounds weird, but
that's the way it works.  At any rate, just unscrew the big nut, remove the
needle seat, clean it out, and put it back.

If the needle/seat is cruddy, replace it.  If it is nice and clean, reuse
it.

My 50cents.  (2cents 25 times)

-----Original Message-----
From: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] On
Behalf Of boyd casey
Sent: Friday, October 14, 2011 7:01 PM
To: De Tomaso List
Subject: [DeTomaso] Holley 650 problem

Hi guys. I am having a problem with my Pantera. I have a 73 L with a
Cleveland that has  some modifications. It has a Holly 650 (manual choke)
double pumper,
an Edelbrock performer manifold, MSD 6al box, blaster coil and an MSD 8577
Distributor. I don't know for a fact but I have been told that it has a mild
 upgraded cam , Hall big bore headers and mufflers. Over the past few days I
have noticed a deterioration in the way the engine has been steadily
deteriorating. At first I thought it just needed a tune up. I bought new
plugs but before I could install them the car stalled out around five miles
from home. When the engine died I started checking things out and I noticed
that the rear two barrels of the Holly 650 had allot of liquid gas sitting
in the bottom of the barrels. There was gas still pouring from what I think
are the secondary nozzles , and collecting in the bottom of the secondary
barrels. The car was not running  and in spite of the fact that I turned off
my fuel line ( I have an in line ball cock valve that I turned off when I
saw the gas pouring into the carb.) In spite of my turning off the fuel
supply the gas continued to drip steadily from the nozzles! ( I assume it
was gas that was already in the fuel bowl). I don't know allot about carbs
 but based on my limited knowledge I think it my be a stuck float. So I am
looking for advice.  Should I get a rebuild kit and rebuild it or should I
buy a new carb? If the recommendation is for a new carb should it be a
Holley or something else?  On a side note after I let the car sit for around
 1 1/2 hours (the engine cooled and a lot of the gas evaporated out of the
carb)  ( I also tapped the fuel bowl with a steel wrench handle in the hopes
that it might dislodge a stuck float )  Luckily I was able to start the car
and drive it home! So please share your advice.  It is my understanding that
Holley carbs require a change of jets to adjust the fuel flow. Are there any
carbs that can be adjusted with a screw instead of changing jets!
Thanks,
Boyd
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