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Re: [T3] A few stock F.I. fuel pump questions

On 16 Feb 2005 at 18:55, Mysterious J wrote:

> 1. Will the stock pump, properly regulated, work with carbs?  I figure
> if I go this route now, potentially going back to F.I. at a later date
> will be that much easier. 

You CAN use the stock pump, with a FI regulator (turned to minimum pressure, 
~20 psi) and the FI return line, and then add a branch in the engine 
compartment to a second carb suitable regulator to bring it down to something 
like 4 psi. I've done this on my '73 in preparation, like you, for returning it 
to FI. It works fine, but you MUST make sure that you don't try to feed the 
carbs more pressure than they can handle.

There's a hazard to this that you should understand. With the FI, if you have 
an accident that kills the engine for any reason, the FI brain will shut the 
pump off. Without the FI brain you'll have to wire the pump to the ignition 
switch which will leave the pump running if there's an accident and you are 
knocked out. This could be a fatal situation.

My plan is to install the FI brain, wiring harness, and distributor so that I 
can still let the brain control the pump, but that's for next summer and I 
should just put the new FI engine in there at the same time.

An alternative is to install an impact safety switch in the fuel pump circuit. 
I believe that NAPA has these for something less than $20. John J. should have 
the details on these if you need them.

> 2. Will I need a fuel return fitting on my gas tank? 

Yes, definitely.

> 3. Does anyone have an extra fuel pump pigtail?

I probably have one, but may take some doing to find it.

Jim Adney, jadney@vwtype3.org
Madison, Wisconsin, USA

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