Technical & General Discussion Area > Tech Torque Pre 1973

Carb Over-fuelling?

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McBrain:
Hey guys.

Have a look at the attached video. Does that look like too much fuel coming out the primary nozzles? It's not even atomizing (esp. the left hand nozzle)

Revving to approx 40% throttle

https://photos.app.goo.gl/EY5Wp8pnMpFZPssBA

McBrain:
For those that are perhaps nervous about clicking on the link...

What should the fuel look like coming out the discharge nozzles (not the squirters)? Fine mist? Or closer to opening a tap?

GLENN 70:
Make sure you float levels are correct . Set so fuel does not come out of the side of the bowls , when the screws are out ,set just below and fuel just come out when you shake the car . Don’t use BP 98 .

McBrain:
What's wrong with BP98??

That's what I always use

GLENN 70:
Can have problems in classic cars/ engines that have a holley carb on them . Too many cleaning agents in it And  all sorts of crap . Very good in late model fuel injected engines tho .  Seen fuel come out of the vent tubes on holley carbs running on BP 98 .  Yours should only be the float levels too high .

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