Quote:
PackardV8 wrote:
What about the FUEL PUMP??? I do not claim to be well versed with the TBI nor the EFI. BUT my understandding is that TBI = HIGH PRESSURE pump = HIGH HEAT condition of pump AND fuel = pump must be INSIDE of gas tank for cooling by the sloshing gas.
So does that mean that the TBI conversion kit u r using comes with a pump that will fit the Packard tank without cutting the tank to accomodate the pump????
you can run a return or returnless system with the FAST EZ-EFI or any tbi conversion really. it is recommended in my region to run a return system, Texas heat.
you can also run an external inline electric pump or in tank electric pump. there are combinations of the above that will yield results in the middle.
such as....an inline electric fuel pump with a return line to the gas tank after the TBI with a pressure regulator. this keeps the fuel circulating and cool and maintains pump pressure. the disadvantage to that is the pump is noisier and runs hotter, but you can also change it on the side of the road without dropping the tank if/when it goes bad. this is the choice I'm going with as the new repo tanks have that drain bung on the bottom which is perfect for the return line and I don't want to cut a hole in the tank to put an in tank pump inside.
the perfect, no vapor lock, no cavitation, no pump issues solution is to run an in tank pump with a return line and pressure regulator...this is how OEMs do it now.
you can, for the cheap version, run a return-less with external pump, but you will set yourself up for cavitation and vapor lock and premature pump failure. one way to combat this on this type of system is to run PWM pump....(pulse width modulated) the pump pulses and this allows the system to measure pressure and only tell the pump to hit when it needs supply instead of constantly pushing against a closed loop system. the problem with this is you cant use metal lines as they wont pulse as well as rubber lines. also the tbi ecu has to beable to control the fuel pump, instead of the pump being on a separate relay. msd atomic system does this. ez efi does not.
some in tank pumps are indeed small enough that they might possibly fit through the hole of the sending unit in the Packard tank, but then how do you get your hand in there to plumb it up???!! the solution would be to drill a hole in the sending unit and weld in a gas line....like some sending units already have.....my dart does. if there is enough room between the trunk deck and the tank that is...maybe a 90 degree bend to a rubber hose and then on to the factory line and plug the hole in the tank where the factory line goes.
the only reason for going with EZ EFI over the MSD Atomic is that they have a dual quad setup and MSD doesn't. BUT, the MSD Atomic can control the fuel pump with no need for relays and it has a setup for running two electric fans, it can also accommodate idle bump for A/C installs, also can control timing when used in conjunction with the MSD 6a CD ignition and dizzy. the MSD setup has many more options and less plugs and wiring. I'm going with the MSD unit on my Dodge Dart 340, but the EZ EFI will have to be the unit for the Packard so I can run dual quads.
the EZ EFI kit also has the linkage to connect the two together...I just have to run my single carb linkage to one of the TBI with a longer or shorter rod and pop it on the stud. bam done.
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