<VV> Electric fuel pump

monza67 at aol.com monza67 at aol.com
Mon Dec 17 17:40:26 EST 2007

A poorly installed electric fuel pump is much worse than a mechanical pump. I once bought a 66 110 hp Corvair?that had an electric fuel pump installed on the lower shroud by the oil cooler. The 'mechanic' that installed it made his installation easy by running hose between the body fuel line and the inlet of the pump. He routed the hose right on top of the head shroud. It was a hot August day in Iowa, and you can probably guess the rest of the story...I made it about 10 miles before it acted like I was out of fuel. We pulled it home and put the correct line on it and a mechanical pump and it worked fine. What was happening is that the hose was collapsing from being so hot and on the suction side of the pump. 

Chuck Prosise

-----Original Message-----
From: Sethracer at aol.com
To: bradwaddell at sbcglobal.net; virtualvairs at corvair.org
Sent: Mon, 17 Dec 2007 10:07 am
Subject: Re: <VV> Electric fuel pump

In a message dated 12/16/2007 11:57:00 P.M. Pacific Standard Time,  
bradwaddell at sbcglobal.net writes:

I want  to install and electric fuel pump to help the fuel delivery.   Should
this pump be a pulling pump as the engine or should it push from the  tank?

You will get a bunch of suggestions. The system I like best, if you are  
using regular carburetors, is the in-tank pump kit sold by "The Source" I  
believe. I think Lew Rishel was building them. They added a low-pressure in-tank  

pump and mounted it on the sending unit support inside the tank, adding a  
pass-through to feed it power through the sender - so no additional tank  
penetrations are needed. It is a clean set-up and, since the pump runs submerged  
fuel, it should be quieter than an external mount. The surrounding fuel acts  as 

a cooler for the motor in the pump, so don't run the car out of gas or the  
pump might be damaged. There are additional items needed for a regular street  
installation, notably a method of controlling the pump power if the oil 
pressure  drops - (due to the engine stalling or quitting). There are 
cut-off  oil pressure switches (Vega) which will help. On most installations on  

frequently driven cars, the pump will come on after the car starts and the oil 
 pressure comes up. That is usually fine. If the cars sits a bunch and the 
carbs  are dry, you might have to bypass the cut-off to get fuel to start up. 
Under no  circumstances should you mount an electric pump in the engine 
compartment. They  are much better "pushers" than pullers, and the lower the 
the better.  Also remember that with a pump added in or near the tank, your fuel 

system  is now pressurized and subject to gas leaks. Check all hoses and 
clamps! Seth  Emerson

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