| Hi Charlie; This is good for new builders and others having to do rebuild or a redesign, but I'd like to add my 2-bits for the benefit of any new builders that are still early in the construction phase. I would seriously investigate the possibility of using an in-tank pump in each tank. Especially if you are considering auxiliary tanks. My desire to have inboard, outboard and tip tanks on each wing, caused untold amounts of complexity in valving arrangements. I really wish I'd at least considered in-tank pumps, but at the time I wanted to use the same in-line pumps that everyone else was using successfully. Another factor in my reluctance to use the in-tank pump was that at the time they still required a return line that would have to be managed, but today's in-tank pumps are usually returnless with the regulator built into the pump. I can't say much more about them as I haven't investigated any more in depth but I would encourage new builders to further explore the possibilities of these as well as the one you mentioned.
Todd Hi guys,
One of the things that drove me to add a 2nd alternator to my install is
the relatively high current draw of the 'standard' Walbro GSL393 fuel
pump (around 6A). I looked at using the little turbine pumps (around
3--4A), but they must be inside the tank(s) since they cannot self prime.
Over on the VAF (RV-x) forum, there's a guy who's using the typical
Bendix style injection on his Lyc, but wants to eliminate the engine
driven pump. He's also (drastically) over- (and incorrectly) thinking
that what's already available isn't safe, so he's embarked on his own
research. Fortuitously, he turned up something that could be useful to
us. Turns out that Walbro makes a smaller gerotor pump, that can supply
30 GPH (instead of 60), and only draws around 2.5A. Model is GSL414; a
bit harder to find, but roughly the same $ as the 393. If I hadn't
already done the alternator work and bought the pumps, I'd be giving
this a serious look.
Here's his testing thread, if anyone's interested.
http://www.vansairforce.com/community/showthread.php?t=168793
Charlie
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