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Message: [QUOTE="TARM, post: 73149, member: 578"] Yes It can work as a lift pump the same as an AD or a FASS. This is of course minus the filtering the AD and FASS does. But you can use the normal filters for that and save a ton of money. Air removal would be the only thing you would be missing. If you look at the post on PSN I mentioned ways to still do the air removal if you wanted to. The air removal of the FASS is not complex. I would recommend running the 4600 that has pressure regualted to 6-8 psi as there is no need for more. I ran 4601 only becasue it going to a surge tank so it has no pressure. They are both the same pump (4600 and 4601) The 4601 just has the internal setup to higher pressure limit. Obviously the higher constant pressure the harder the pump is having to work. In this case there is no point to it and it will just lead to working the pump harder for no benefit and as with anything the harder you work it the faster it will wear out. The carter has a free flow rate of 100gph. That is clearly over the flow rate at pressure of any of the stock pumps or even many of the aftermarkets. It will always provide whatever flow the high pressure pump needs up to that 100 gph. This will take stress off the hi psi pump and actually allow it to flow more at a given pressure. You also would not need the extra hoses etc of the AD /FASS You would only need to cut into the feed line between the tank and main pump and install the . IMO try to put it as close to the tank as possible. It is small so its easy to mount. This is one thing I think I finally came to the conclusion of. That is given the flow and pressure we need for fuel demands once you out reach the capacity of the stock pump its best to run two pumps as opposed to trying to have a aftermarket single handle all of it. Whether that is a setup of a parallel up to stock flow levels for each pump or in a 2 stage setup where you have one low psi high flow feeding a high psi pump. Even these nice big pumps like the aeromotives or for that matter the brushless Feulabs as good as they are. When you look at the limitations on how they must be setup to work reliably you can see these pumps are having to be designed in a manner that in a manner of speaking makes them fragile. Example: Nothing smaller than a 100 micro pre filter, Recommended to only feed from a sump no pickup without the understanding of decreased pump life and performance Feed lines of 10-12an even with a sump. Must be run at reduced rate if using for constant duty or a PW controller. Should not be operated below a 1/4 tank etc... Simply by adding a feed pump you remove most all of those issues and limitations. [/QUOTE]