RE: JETT 90L feul pump?
The fuel system pressure developed by the jett-stream and turbo-jett mufflers, combined with their balance backpressure make a pump unessecary for 98% of model applications.
The Jett carb does not work well with a perry pump. Rarely works with the Cline or IronBay regulators too (little suction demand).
Its not impossible, it can work with the Perry, but it takes a bunch of work on the test stand to get things set up. Unless you are ready to commit at least a couple of hours of bench time to setup of the system before installing it in the aircraft - AND you 100% know how to adjust both the engine AND the pump.... its not going to work.
Underlying thing is..... a pump is very rarely necessary. Especially on the 90L engine. Folks whol have tried (and failed) to use a pump with this engine all had underlying fuel system problems, and the pump doesnt fix those - in most cases it makes the problems worse.
Alternatives...
The bubble-free fuel system is a first step. Works great, as others will attest to. Eliminates 90% of most fuel system issues by design. The other 10% of problems are easy enough to deal with.
If it is a situation where you want to relocate the tank - carefully consider why you want to do that.
If it is for adding fuel capacity... or installing a larger tank - go this route. Use a small hopper tank right at the firewall, fed by the larger main tank, is the way to go.
There are a few threads on here about the bubble-tanks and the hopper tank setups. Look back in the forum threads.
Bob