[Healeys] fuel pump polarity

[Bob Spidell]

By 'cap' I mean capacitor (except for 'plastic cap'). 



bs 

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Bob Spidell - San Jose, CA 

----- Original Message ----- 
From: "Bob Spidell" <bspidell at comcast.net> 
To: "Mal Bruce" <mbruce6 at cogeco.ca> 
Cc: healeys at autox.team.net 
Sent: Monday, August 31, 2009 8:55:00 AM GMT -08:00 US/Canada Pacific 
Subject: Re: [Healeys] fuel pump polarity 

The only determinant of polarity is what's used to mitigate point erosion: 

1) nothing (early pumps) 
2) capacitor (mid-age pumps) 
3) diode (most recent pumps) 

To be sure, remove the plastic cap on the end of the pump. If there's nothing besides points and the throwover mechanism, polarity doesn't matter. If there's a diode--the stock ones are a black plastic canister with red (positive) and black (negative) leads--determine which lead goes to ground (across the points). Same story with a capacitor, but it might be harder to determine the polarity, if any, of the cap (it might have a "+" and "-" on either end). I believe the caps are electrolytic, and if the polarity is reversed the cap will be destroyed (probably become a dead short). If the diode is forward-biased you'll have a dead short, and the pump won't work. 

To change polarity reverse the cap or diode leads. 


bs 

-------------------------------- 
Bob Spidell - San Jose, CA 

----- Original Message ----- 
From: "Mal Bruce" <mbruce6 at cogeco.ca> 
To: healeys at autox.team.net 
Sent: Monday, August 31, 2009 8:10:51 AM GMT -08:00 US/Canada Pacific 
Subject: [Healeys] fuel pump polarity 

I have four fuel pumps, three are AUB 662-1 and the other is AUB 662. Since 
the pumps have all been used at one time or another on both MGC and BJ8, 
negative and positive ground respectively, how do I find the polarity. Thanks 
in advance for the help. 

Mal 
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