I have seen where many of you changed over to ele. fuel pump.  If so, do you still use the fuel return line?  Where is that coming out from?

Also I was told that it is best to install ele. pump closer to fuel tank but I have seen here that many have in engine compartment.

Thanks, Ron

Electric pumps that do not use a diaphram do not pull very good vacuum.  The further away from the tank, the less fuel, if any, it may deliver due to lack of ability to pull vacuum from the tank.   If it can't get fuel, it can't make pressure and flow.  Check the specs on the pump.

The return line depends on the pump also.  If the pump is operating at the correct pressure, a regulator is not needed.  If a regulator is used, it may use a return line, and it may not depending on design.  Most of them do not.

That means you could simply seal the return line.  But the return line is there to help cool fuel by keeping it curculating.  This prevents vapor lock in hot weather due to overheated fuel boiling in the fuel lines,  or preheating fuel in the lines before it goes into the car and boils there.

If you find you have, or suspect that you will have, vapor lock problems, it easy to prevent.   Just use a pump with more flow than you need.  Connect a tee in line between the pump  and carb.  Run the tee to a fixed orifice, and allow a constant flow to return to the tank.   If the orifice is too small, it won't cool enough.  If it is too large you will starve the engine.   It may require a larger capacity pump and the return.

Typically at 5 - 6 psi, the max for most carbs, the fuel won't boil.  But in hot weather it may.  More true with a set of headers.

I was looking at the Holley blue that Ben has suggested in the past.  It seems to have more than enough power to "pull" fuel up.  Since I now live in Phoenix (It was in 90s yesterday) I was concerned about vapor lock.  I will have to find out if the Holley regulator has a return line.  Thanks.

Does the fuel pump run all the time or shut off like a compressor untill more presure is needed?? 

I was told today by a neighbor that with a mild modified, (guessing 350Hp) engine that my mech. fuel pump will do just fine.  So my questions still is..is it worth the extra $150 or so to go to ele??

Actually a return is quite simple.  You just need to use a bypass regulator on the outlet side of the fuel pump.

Holley's Part number is 12-803BP.

1.  run the fuel line from the take to the inlet on the pump.

2. run the outlet of the pump to the inlet on the regulator

3. run the outlet of the regulator to the inlet on the carb, making sure you install a line pressure gauge.

4. run a line from the return side of the regulator to the existing return line on the chassis.

5. start your engine and adjust your fuel pressure.

6. check your fuel level in your fuel bowls and adjust if necessary.

Don't forget you will need to make sure you have all the fittings to install these items.  Most holley fuel pumps and regulators have 3/8" NPT inlets and outlets.  I find it easiest to connect things using AN lines and fittings.

5.