There are many type of lift
pumps out there but they really fall into two categories, mechanical and electric. Speaking generally, mechanical pumps tend to be more trouble free. They are usually driven off the cam but some are belt driven. Most mechanical pumps have a diaphragm
and two check valves although some are impeller type. Electric pumps can work quite well and do make bleeding the system easier.
When specifying a pump that is different than the stock one, pressure and flow rate are important as well as durability since the pump runs continuously whenever the engine is on. The end goal is to get adequate fuel flow to the injection pump at the correct pressure. Your injection pump will have an overflow valve which is a spring loaded valve that controls how much fuel flows back to the tank which also regulates pressure. Typically, an engine will return ~90% of the fuel to the tank so you can get an idea of the volume required. If the pressure at the IP is too low, you will have low power
and may actually damage your injection pump depending on how it is lubricated. Overflow valves are not perfect regulators so if the flow to the pump is great enough, too high of pressure is possible too. Too much pressure is an issue as well since it will damage certain parts
inside the injection pump.
If you are going to an aftermarket electric pump
, look at getting a good one. If you buy a cheap
pump, you will end up having to replace it and likely an IP at some point as well. In addition, the nicer pumps let you regulate the pressure at the pump. I would highly suggest the pumps made by FASS (even their smallest one would be plenty for the given engine) and you can get the pressure right. I don't know what the fuel pressure spec is for the given engine off the top of my head
but it shouldn't be hard to find. You don't need the pressure to be exact but you should be in the given range at all rpms and loads.