Below is a few basic observations we've made over the years in regards to where your pump should be mounted relative to the type of tank being used.
If you have a tank with the outlet at the bottom of the bladder like the one pictured, we think the pump should be mounted either parallel to rear torsion rack, as close to the outlet as possible and with only swept / full flow type fittings used. If that's not possible then the next best location is over on the rear roll cage upright as low as possible and again using only swept / full flow type fittings, if you do this right your almost guaranteeing that the pump has a head of fuel on it the whole time.
If you have a tank with the outlet in the right hand corner of the shelf like the one pictured, then we believe a great spot for the pump is down in front of the seat on the floor pan (or at least that low somewhere close by. If you can do that it will allow for a nice constant fall in the fuel supply hose from the tank outlet to the pump, once again use only swept / full flow type fittings. When we do this we're trying get a situation where the fuel will siphon itself to the pump creating some head pressure at the pump inlet.
I have no doubt there are some great fuel pumps out there that we have not used or don'r know about, however we have some experience with the inline Walbro GSL392, these are great little pumps for the money and when mounted and plumbed correctly very reliable. Although even Walbro recommend the use of a pre filter before the pump we haven't found the need to do so, if you're careful!! have a decent filtered funnel then if you fill your churns with it and then fill your tank with the same funnel the pre screen in the pump SHOULD be adequate.
If you choose to run any other brand or type of pump, especially all the really cheap Chinese knock off's of either the Bosch 044 or the Walbro that are readily available for $30AUD ($15USD) or so online.........Don't bother calling when when your stuff doesn't run right! Put the right pump in the right position with suitable plumbing and have fun, saving some money and buying a rubbish pump isn't worth the drama...
So in short we think that it's really important to:
*Keep the pump as low as possible *Keep the plumbing on the supply side of the pump as short as possible *At all cost's avoid loops and excessive bends / elbows on the supply side of the pump *If you feel the need to run a filter before the pump make sure it provides the least amount of restriction, it needs lots of area and to be made of 100 micron or larger aperture mesh *Keep the wiring to the pump as short as possible and use suitable size cable, depending on the pressure they can draw up to 15AMPS *My take on it is, If you have to throw the pump in the bin every 20 nights and replace it just to be safe....it's probably cost you about $10AUD ($5USD) an night to run the pump, sounds like a pretty good deal to me if you're reliable and having fun.