Questions on Electric Fuel Pump

[mdeluca]

I plan on replacing my mechanical fuel pump with an electric.

I have a Weber 32/36 carb. on a AMC 258 i6 / 4.2l IL6.

1. I've decided on the Holley Mighty Mite fuel pump but wanted to check with you guys on which one to get. My understanding is that the sweet spot is 3.5 PSI for the Weber. Should I get the 1-4 PSI or the 4-7 PSI?
   
   
2. I don't plan on using a regulator, but if it should become necessary, which of the two pumps would be better suited?

I plan on using a relay to feed an inertia switch mounted on the firewall, mounting the fuel pump on the frame rail just ahead of the tank with a pre-filter, running the fuel line to an OEM style fuel filter, then to carb. I plan to blank the mechanical pump.

Thanks for your thoughts.

 

[PistolDave]

Something you might also consider is a oil pressure shutdown switch. It is wired so the switch is bypassed during cranking, then as soon as the engine starts making oil pressure the switch closes and allows continuous fuel pump operation. If the engine quits running like during a rollover, the loss in oil pressure shuts down the fuel pump. There are many write-ups and diagrams on the interweb for this.

 

[caveman]

I'm using the Carter 2070. 4-6 PSI and it worked well with the Weber that I had and with the Motorcraft that I'm running now. The Carters are loud. Not sure how loud the Holly will be.

 

[Torxhead]

I run an external electric pump to a t.b.i. system and it seems to work pretty good so far. My opinion of it is that it is pretty tricky to set up. The pump has to be mounted in line at either at the lowest point in the fuel system or as close to the tank as possible. The free flowing fuel filter must be mounted before the pump to protect it against containments. The oem fuel tank breather must be working properly also. PistolDave's makes a great suggestion also. After reading the CJ forums for many years, the Webers run best at a 3.5 p.s.i. with a regulator. Make sure the pump does not get warm to the touch also, as it will burn out. I think most guys who run Webers on the CJ use a mechanical pump. The CJ does not have a baffeled fuel tank to properly run an electric pump either.