Which external electric pump?

that wasn't directed at you bud, just my reaction to a typical one sentence warrior jumping in with an apples to oranges comparison, that completely steers someone in the wrong direction. far too often people jump in to just harp on someone else's post, without providing any realistic or good info. glad you found a fuse is your issue. No matter what someone tells you, the fuel gets hotter in a dead head system, and the fuel pump works harder in a dead head system. thats a fact.period. adding a return will cut down on both of those things, despite the fact that someone with a pump that runs for minutes at a time..has had one working for years.

let me see if i remember JR High math class...

heat + electric =bad
hard working pump + cavitation = less longevity

return line = more longevity.

more longevity = good

haha :cheers: cheers mate

Add less noise to that list of positives. If you have the bypass pressure closer to the required line pressure you need the pump is much happier and quieter.