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I am in the process of mounting an electric fuel pump into the gas tank of my 61 to feed a 4.6. The 4.6 is a 2002 and those engines ran with a return type fuel system. I have a fuel pump from a 1994 4.6 I was going to use. I also have a fuel pump from a 2003 4.6 which used a returnless style fuel system. With the return type system, the fuel pump pumped at the same rate, excess fuel returned to the tank. The returnless system pump, pumped at various rates depending on engine demand, no fuel was returned to the tank. Here is my question: Can I use the 2003 pump in a return type fuel system? Looking at them side by side they look identical. Reason for using the 2003 is that it is newer might last longer. The ECM is getting flashed so it won't know what is supplying fuel to the fuel rail.
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The fact that they look identical tells me they are "probably" the same part however there could be some sort of internal valving that is different. I would go to an auto parts store web site like look up both applications and see if they use the same part #. If they do than you are good to go, but if they don't then you are probably still ok as the pump does not know if you are running at WOT all the time or if there is a return line, in other words it was designed to run a WOT with fuel flowing freely so there is no issue. If you were going the other way and running a non return line system then I would be concerned (assuming the parts are different) as the pump would not be designed to have that kind of back pressure. make sense??
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Thanks for the reply. I was thinking along the same lines...at WOT either pump would deliver the same amount of fuel/fuel pressure as they both came off of 4.6 cars. I previously checked part numbers and they are different. To clarify the actual pumps look "identical" however the screens and electrical connectors are a little different. In addition the return less pump has what looks to be a pressure relief valve on the supply line?(left one in the picture)
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I would think to use the pump that matches the application. If you are running a return type fuel system, then use the pump for that for fewer potential problems down the road. The whole "one year newer may mean it has more life in it" rational is, I think, not worth considering. When either pump fails you will replace it and you will never know when it will fail. Use the correct pump and when it finally does fail replace it with a new one and keep on driving.
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Thanks for your thoughts. Makes sense to stick with what should be there. As mentioned the one pump is 9 years newer than the other one. Just thinking I would get more life out of it?
Last edited by dan_6776 (November 17, 2015 5:30 pm)
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so how do yo plan on mounting your pump in the tank??
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I measured the deepest part of the tank and the pump should fit. On the crown vic fuel pump/sending unit assembly cover, there is a bung that accepts the electrical connector for the pump.(The electrical connector is round with an O ring and slides into the bung) I will cut the bung leaving a small flange for welding. Drill a hole into the side of the tank next to the fuel gauge sending unit and weld bung to tank. Next I will shorten the existing bracket for the fuel pump to fit the depth of the tank. I will need to cut a hole in the top of the tank to insert the fuel pump. I will make a new cover for the pump and bracket and screw with rubber gasket to the top of the tank. Finally, I will cut the strainer off of the Galaxie pick up tube on the sending unit and with rubber hose line connect to pump discharge. I would use the existing vent tube on the fuel tank as the return line. A vented gas cap will allow the system to vent to prevent vacuum.
My first kick at the cat, so if there is an easier way I am open to suggestions.
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Dan
heres another route you could go.
Now before everyone freaks out it is a chevy site. Sorry guys.
BUt makes adding an efi fuel pump to almost any tank, using junkyard parts
I also have the pattern in a pdf file for the cutout for the ring in full size, so you just cut it out and use it as the
template if needed
Last edited by 69crewcab (November 18, 2015 8:16 am)
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dan_6776 wrote:
Thanks for your thoughts. Makes sense to stick with what should be there. As mentioned the one pump is 9 years newer than the other one. Just thinking I would get more life out of it?
I seemed to have skipped over the '94 reference and only registered the '02 and '03. However, I would still think it would be best and easier to run a pump designed for the system on the engine. If you're really concerned about the life of the pump I believe it would be most prudent to get a new one. RockAuto shows a complete '94 pump assy. for ~$110, cheap in the overall scheme of things for project like you're tackling.
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69crewcab,
I was aware of that type of mod to fuel tanks but unfortunately I can't go that route because the top of the fuel tank rests against the bottom of the trunk floor. There is no space to run fuel lines or wires. Thanks for the suggestion however.
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