Fitting Thread Spec for early B Fuel Pump

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Conrad Carter
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Fitting Thread Spec for early B Fuel Pump

#1 Post by Conrad Carter »

Anyone know the thread spec for 1963B early fuel pump discharge port? M12 x 1.5?
Conrad

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Ron LaDow
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Re: Fitting Thread Spec for early B Fuel Pump

#2 Post by Ron LaDow »

Conrad, if this is a banjo fitting, you need to be careful. The bolt appears as if it is interchangeable with the banjo bolt on the Zenith carbs and it is NOT; the thread pitch is different.
The carb parts used to have a "V" stamped into the head ("vergasser"), but that ended at some time or other. I'm not where I can check right now, but that 1.5 pitch rings bells as the carb bolt.
Ron LaDow
www.precisionmatters.biz

Conrad Carter
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Re: Fitting Thread Spec for early B Fuel Pump

#3 Post by Conrad Carter »

Ron,
It is a banjo thread...why I am being careful. Can anyone confirm M12 or M14?
Conrad

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Ron LaDow
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Re: Fitting Thread Spec for early B Fuel Pump

#4 Post by Ron LaDow »

I'm certain is is m12, since the wrong bolt has been threaded (forced) into both the carb tops and the fuel pumps; equally certain the pitch is different.
Ron LaDow
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John Brooks
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Re: Fitting Thread Spec for early B Fuel Pump

#5 Post by John Brooks »

Geeze guys, go get a thread gauge and measure it.
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John Brooks

62 Roadster
66 912
84 Cab
getting pushed around in porsches since 1965

Conrad Carter
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Re: Fitting Thread Spec for early B Fuel Pump

#6 Post by Conrad Carter »

I would except car is 2 hours away.
Conrad

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Tom Wavrin
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Fitting Thread Spec for early B Fuel Pump

#7 Post by Tom Wavrin »

Bruce Smith's article from July/Aug 2015 states the hollow bolt for the DVG fuel pump is a 12 x 23 x 1.5 whereas the carb hollow bolt is the same except for a 1.25 pitch. I've made the mistake of interchanging them incorrectly once.
Tom, Reg # 10576, Oregon
'62 1600S Karmann HT

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