66fastback wrote:

Considering that you are using an aftermarket harness, I would have to take a guess on how they are using the "red" wire.  I would expect them to include directions for things like whether or not you would need a relay.  If I were building an aftermarket harness, I would include all the relays needed and the wire would hook up dirctly to your fuel pump.  Even the factory Ford Mustang harness used a relay up front and the wires that ran to the back hooked up directly to the fuel pump.  If they have not supplied a ground wire, make sure that you hook up the ground very well.

I know I have not answered your question, but hopefully have given you some insight on how it typically done.

On a related note, good luck with the inline fuel pump.  We tried a variety of inline pumps, mounted as low as was safe, and always experienced vapor lock when the summer temps got up into the 95 degree range.....which was every day in Texas.  We eventually converted the fuel tanks to accept the 5.0 Mustang style pump assemblies and never had any more problems.  Just something to keep in the back of your head in case you ever experience the same problem.

 Can you elaborate on exactly what you did to install the pump inside the tank?

MS....it has been a lot of years since we converted our cars (amazing how time flies).  I would say about 15-20 years ago we converted our cars to efi.  We took the tanks to have the bungs brazed to the tops of the tanks.  The part I don't really recall is just how much modification was required after that to make the 5.0 Mustang pump assemblies fit.

I am pretty certain that I had to shorten mine to fit the standard 16 gallon tank.  I think the one we put in my dad's car was more of a straight swap.....he had put the 20 gallon tank from the 69 models into his 67.  The taller tank was just about the right height, if I remember correctly. 

I do recall not being happy with the seal on the bungs that were welded in.   I could almost always smell a little gas.  I think the best option these days is to get a new tank from Tanksinc....they have them with the fittings welded on for the sending unit and the pump assembly on top of the tank, eliminating the sending unit in the front that is below the fuel line (who ever came up with that idea?).  Anyway, the tanksinc tank is also baffled for better fuel control around the pickup tube.
http://www.tanksinc.com/index.cfm/page/ptype=product/product_id=345/category_id=145/home_id=-1/mode=prod/prd345.htm

James W--go with whatever works for you.  We tried, and burned out several inline pumps of various manufacture origin.  We did not try to use a LP pump and holding tank, but we did mount the pumps on brackets that held them down around the bottom of the tank.  When we got tired of the problems, we went to the in-tank solution and both drove our cars for close to 100k miles each that way.

Jeff in GA wrote:

On warm days after driving it awhile, it will tend to develop a bit of vacuum in the tank and you can hear a slight hiss when opening the cap

As for in line pumps:  We've put over 16k on our 66 with a Walbro pump mounted inline and the fuel return going  into the tank drain port.  Car has been to Dallas in Sept and Kalispell in July with a side trip to the top of Pike's Peak.  On the trip to Kalispell we ran it down to about 1.5 gallons and never had a hicup.  I have a flat fuel sock adpted to the pickup on a repop sender which, I think, really helps with the fuel slosh problem.  The pump/filter is mounted just below the weld seam of the tank.



As for the "vacuum" on the tank.  Are you sure it vacuum?  Our brand new 20 gal tank swelled up like a basketball by the time we got home from Kalispell due to the rising fuel temp.  The tank cap will ven in but not out.  I'm planning a vent line like the old Falcons had that made a couple of laps around the upper right quarter then went down through the trunk extension.

BB

Last edited by Bullet Bob (9/01/2013 8:52 PM)

I decided to move out on fixing my fuel system, so I ordered a 1/2qt holding tank from BC Broncos, a carter low pressure pump and an E2000 high pressure pump.  Should all be here in time for next weekend.

In the meantime I thought I'd get a jump on dissassembly so I started emptying the system.  hmmmm can't get anything to pump out... so I take off the drain plug out trickles about a half a pint of gas.  

now I understand why it was cutting out.... 

On the good side, when I had the tank empty, I went ahead and pulled the filler tube and installed a vent.

Fuel Sock:  FS-130 from CarQuest.  I think the number is the same everywhere.  It's a pretty common unit.

I had  to do  a little lathe project to adapt it to the stock pick-up tube.  Mine is "tuned" so that the sock lays right on the bottom of the tank sump.  These things are pretty cool as they tend to  "skin over"  when the  fuel  sloshes away from them for a few seconds and don't let the  pump suck air.  I discovered the phenomenon when I stumbled  across some fine mesh fuel pick-up made for ATVs.  I think that was on a web site that sells the Walbro pump.  The ATV pick-up was too big for the Mustang sender hole...as I recall.

BB