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-   -   Critique my fuel system layout (https://vansairforce.net/community/showthread.php?t=117557)

digidocs 09-15-2014 09:06 PM

Critique my fuel system layout
 
(old message removed)

aerhed 09-15-2014 09:49 PM

Aren't you missing a bypass tube?

Tom Martin 09-16-2014 05:01 AM

That fuel filter is not going to be easy to service. Build a door in the bottom of the fuse directly under the filter. You will thank me every year at annual time!
I have installed access doors on quite a few RVs and rockets, including a RV10.
They are very similar in construction to all the other access panels on the aircraft.

rleffler 09-16-2014 06:00 AM

Looks just fine.

You only need to worry about the rigidity of lines FWF.

As Tom mentioned, an access panel will make life easier. I put one in on the right side of the tunnel. I know folks that have installed them on both sides of the tunnel as well.

I've already had the opportunity to take both the filter and pump out and it was not a problem.

This is even more important if you install a center console, which makes taking the tunnel cover off more difficult.

Toobuilder 09-16-2014 06:57 AM

Quote:

Originally Posted by rleffler (Post 916749)
...You only need to worry about the rigidity of lines FWF...

This advice is contrary to standard aircraft practice. Even if there is no perceived relative movement between two fixed points, such as between a fuel selector and a firewall bulkhead fitting, there should be enough degrees of bend along the run to accommodate expansion or flexing of the structure. The key point is to bend the tube enough to make sure it is not a structural element.

That said, the picture shows about 90 degrees (total) in that Z bend, and that's plenty as long as the pump and filter can float slightly in rubber mounts. If they are truly rigidly mounted, then I might be uncomfortable with the line from the selector valve.

Bill.Peyton 09-16-2014 07:42 AM

I see that the filter is supported, but don't see that the fuel pump is supported. That's a lot of unsupported mass. I would also agree that adding a large removable panel in the right side would be a good idea. I have one, and it is not a problem to remove my filter to inspect it.

aerhed 09-16-2014 07:47 AM

Duh on the bypass. Actually I think if your tunnel cover comes off fairly easy you don't need an extra access. Screws are screws and its good to look in there periodically.

TS Flightlines 09-16-2014 12:43 PM

Plumbing the new version AFP pumps is a breeze. Looks like you do have enough offset between the valve and the filter. Like Tom and Bob said, the filter in the tunnel is a little bit of a pain. Several customers now are mounting filters in the wing roots to make life alittle easier. Some of our European customers have mounted gascolators in the roots.

I would hate to spill fuel in the tunnel or cabin of an RV10---especially after all the hard work, carpet, leather, consoles etc.

Tom

Mike S 09-16-2014 12:49 PM

Quote:

Originally Posted by TS Flightlines (Post 916896)

I would hate to spill fuel in the tunnel or cabin of an RV10---especially after all the hard work, carpet, leather, consoles etc.

Tom

Luckily the floor of the tunnel is lower than the floor where the carpet is.

rightrudder 09-16-2014 03:38 PM

Quote:

Originally Posted by TS Flightlines (Post 916896)
Plumbing the new version AFP pumps is a breeze.

I hope it's the same inline configuration for the RV-9. I've got an AFP pump on order, but Van's engineers are currently redesigning some of the sheet metal to accommodate the new pump. The double-decker thing is OK, but it sure requires a lot of odd bends in the tubing.


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