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Old 08-30-2017, 12:10 PM
miyu1975's Avatar
miyu1975 miyu1975 is offline
Join Date: Apr 2008
Location: Indianapolis, IN
Posts: 1,029

add fuel, somehow..probably build wet tip tanks.
Ryan Allen, CFII

RV 7 N324TP IO 360 A1A
Flying since 7/2012
Ferry Pilot Services Available
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Old 08-30-2017, 12:30 PM
rv7charlie rv7charlie is online now
Join Date: May 2006
Location: Pocahontas MS
Posts: 2,752

To each his own, but...

Hard to see what a wingroot gascolator will do that the quickdrain in the tank and a decent filter (or an automotive style 'sock' pickup in the tank) won't do better. Except add to weight, build time, complexity, money, etc.

The fuel caps that came with my early 90's vintage RV-4 are still working fine, and the -7 came with the same style caps.

I did add aux fuel in the leading edges, and it's honestly difficult to imagine at this point that it will be worth the effort.

I did add access panels to the outboard curves of the forward top skin (not endorsed by the factory, but I'm not the 1st to do it), and I don't regret doing that.

Just another perspective...

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Old 08-30-2017, 04:04 PM
tgmillso tgmillso is offline
Join Date: Nov 2012
Location: Launceston, Tasmania, Australia
Posts: 562

Hi Charlie, the gascolators are used for as a filter because I didn't want the filter in the cockpit, and pre-filtering is a requirement for use of electric fuel pumps. They have the same filter mesh diameter as the inline filters. I was going to put the inline filters in the wing root, however in the 7 there is not a lot of room between the wing and the fuselage, so Andy recommended using a gascolator, as it is easier to change in this tight confine. Regarding the fuel caps, I had a dog of a time trying to bend the flanges to match the skin profile, and they would deform the skin when I had it clecoed in place. The deluxe flanges fit perfectly. Those capable of bending stiff flanges to fit the wing profile should be fine. I wasn't.
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Old 08-30-2017, 04:26 PM
rv7charlie rv7charlie is online now
Join Date: May 2006
Location: Pocahontas MS
Posts: 2,752

Makes sense, if you're averse to a cockpit filter. If we're not comfortable with what we're flying, we'll never really enjoy it. A gascolator bowl should be easier to service than an in-line filter.

My plan (auto style high pressure injection) is to do what the autos do; use an automotive filter sock on the pickup tube. The mesh is designed to protect in-tank pumps, the large media area makes it almost impossible to block it, and the shape sheds trash instead of allowing it to accumulate. In cars, they last the life of the pump with no maintenance.

My original final-filter plan was to use one right after each pump for redundancy, but I'm now considering a single final filter just before the fuel rail, more for convenience than worry about having them in the cockpit. The 'other' school of thought on fuel is that if it's in the cockpit, you know immediately if there's a problem, instead of when you get the radio call that you're smoking. :-)

The tank sumps are the lowest points in an RV's fuel system, so I'm happy with that to clear water/trash.

I guess I got lucky with the filler flanges; they really didn't give me any trouble (I did four, so I had some practice. :-) ) Wish I could say the same for some of the other parts of the build....
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Old 08-30-2017, 05:59 PM
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jcarne jcarne is offline
Join Date: Jul 2016
Location: Worland, Wyoming
Posts: 417

If I could do it again I would have considered two things. (maybe more will come as I'm still working on the wings)

1. Buy a QB if I could afford it

2. Since option 1. is not going to work for me I would buy myself an extra box of tissues for rib deburring to soak up the tears.

Seriously though, I have been pretty happy with the wing kit as is, definitely install conduit run and ignore the plans for the fuel tank z-brackets, look at Mike B's website instead. (thanks Mike!)
Jereme Carne
RV-7A Emp. done
Wings mostly done
Working on Fuselage
Finish kit on order
Exempt but gladly paying!
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