I have been following the thread in the Vendor section on EFI, and have a question. I know a electric pump is required for EFI, can the e. pump be placed after the mechanical pump? I would like to keep the tank and all plumbing close to stock until it gets to the motor. I would like to use the billet pump JW is now selling and run a carb initially, then at some point change to EFI. If JW's pump can easily handle the volume - can I use a small electric pump between the mechanical pump and the injection system - just to boost the fuel pressure? As the electric pump would be fed off of a very strong mechanical pump - the hope is to use a small/quiet pump as it doesn't need to draw - it only needs to boost the pressure (volumes would not change). Fuel delivery upgrades from the stock tank would only be larger lines, and maybe 1 extra line for a fuel return for the electric pump regulator.
Won't work. EFI requires pressure at 45 - 55 PSI, the mechanical pump is probably 8 - 10. The mechanical pump will just be removed when you install the EFI. Don't forget you will also need to run a return line to the tank. -Bob Cunningham
Thanks Bob, but I am still confused, if I think of the mechanical pump supplying the high volume/low pressure to the input side of the pump - what difference is that vs the pump drawing fuel out of the tank? As long as the volume needs are met at the electric pump input/low pressure side wouldn't the electric pump just see the fuel coming from a fuel source - be it the tank - or another pump? I am not challanging your comments - I just need to understand. I probably will have to supply a return line, assume a 3/8" line would suffice for fuel return. I also would assume I would not want to overpump the electric side output - just meet the max volume and pressure requirements of the EFI because if I over supplied the electric side - the mechanical pump would now be a restriction.
Maybe if you explain why you think you want to keep the mechanical pump, I can explain better. Why not use only electrical? -Bob C.
Bob, I am staring a frame off, will replace all brake and fuel plumbing with it apart. (I will also be boxing the frame) I would like to keep the underside as stock looking as possible with all lines hidden in the frame rails. I am sure If I used a electric pump it would have to be at the tank - and the pickup would have to be lower than the tank. I also hear alot of concern about noise and reliabilty. I had thought about a intank pump like the GN pump - but it must be alcohol compatible (another subject). I know the mechanical pump JW now has will fit the bill perfect for a carb application - however I want to think about a future EFI upgrade. Once i get the frame and body remated - i don't want to have to redo items. I thought if I could mount a electric pump after the mechanical - I could have my cake and eat it now and latter with little fuss. If I go the electric only route I really want to get the pump in the tank - and out of visible site. Your EFI 455 sounds sweet - was it the TA set-up or custom?
I've been running my system since 2000, about the same time that TA came out with theirs. I had my manifold converted by Force Fuel Injection (www.force-efi.com), and they did a great job. I got the whole system from them (including FAST controller, wiring harness, fuel pump, etc.). There is a lot to address, and the best way to do it might be a phone call- that way we can discuss what you want and prevent you from having to suffer the new-fuel-pump-every-month syndrome like I did for a long time. If you like, shoot me an email and I will be happy to phone you back. There is an ideal way, there are some compromises that you can make, and there are some definate no-nos. -Bob Cunningham
Thanks Bob, send me a PM or email with your phone - and a good time to call. I am also bumping this to the top to look for others comments.
