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Fuel restrictor

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07 Nov 2018 16:29 #1712 by Ken Thompson
Replied by Ken Thompson on topic Fuel restrictor
So, Chris... update please! Everything working correctly now. Hopefully, your header is no longer emptying into your wings. Shouldn't do that.

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14 Oct 2018 18:50 #1691 by Chris Carlisle
Replied by Chris Carlisle on topic Fuel restrictor
OK........New pump in. Looks good on ground runup. Have never seen header fill that fast. Should get mechanic's approval and logbook entry tomorrow and then a few trips around the pattern will tell the tail but very happy with ultimate outcome so far.

Chris

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02 Oct 2018 08:59 #1677 by Randy Hirsch AP
Replied by Randy Hirsch AP on topic Fuel restrictor
Chris - There is some good info on header tanks here: www.ercoupe.info/?n=Main.HeaderTank

I'd also recommend taking a look at Service Memo 43. Do you have the standpipe style older tank with three fittings on the bottom or the newer style tank with one fitting (supply) on the bottom and the drain and pump outlet on the rear of the tank? If you have the older style tank there is a possibility that the standpipe that drains back to the main tanks is corroded or cracked and allows the header to slowly drain back to the mains.

Good luck with it!

Randy Hirsch

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01 Oct 2018 14:34 #1676 by Chris Carlisle
Replied by Chris Carlisle on topic Fuel restrictor
The plumbing is correct in mine. I wonder if the header slowly bleeds back into the wings retrograde through the pump if it has worn out reed valves that leak. Again, that would make sense if it's as old as it seems since it is undocumented in the logs, has no part # stamped on it, and as noted below, kind of questionably maintained.

So, when I disassembled the old pump and took the fittings off it, this is what I found (see pics). The output NPT fitting's throat was blocked with some kind of presumably fuel proof filler that was hard as a rock and had a hole drilled through it, presumably for "compliance" with the AD. Pretty risky if not outright stupid I'd have to say. What if it broke loose and went down further in a crooked fashion so as to block the fitting altogether? Oh well. This is part and parcel with the way the previous owners treated this poor plane and she is certainly full of surprises. I hope I'm getting near the end of the list though.

Chris

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28 Sep 2018 18:52 #1674 by Ronald Raty
Replied by Ronald Raty on topic Fuel restrictor
In my SN1069 415C, the line from the header to the wing tank is near the top of the header tank. Fuel only drains back to the wing tanks if the header is full, it is an overflow. The only line attached to the bottom of the header tank is the supply to the engine. If your header actually drains it's entire contents back to the wing tanks, I would wonder if someone has modified it so the wing tank return line is somehow attached to the bottom of the header tank, maybe a T in the engine supply line.

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27 Sep 2018 17:27 #1673 by Chris Carlisle
Fuel restrictor was created by Chris Carlisle
OK. So I'm feeling kinda silly. Another user was kind enough to sell me his used/rebuilt fuel pump which is on the way because I can't seem to get mine to re-prime after an annual where the usual AD for replacing the gasket and filter screen applies. The new pump is on the way and the seller reminded me that the fuel restrictor fitting on it will need to be added. I had to admit my ignorance when I said that I thought the restrictor went on the line from the header to the wing tanks to prevent emptying of the header too quickly. The seller correctly reminded me that the restrictor fitting in fact goes on the pump to prevent over-zealous filling of the header tank and overflow out the filler neck onto the windshield. The restrictor fitting is available from Aircraft Spruce. The plane has flow just fine without all this time due to my ignorance.

So......I've seen plenty of folks talk about overflow from the header if the restrictor isn't used. I've not had that problem. And........this begs another question. What keeps the header from emptying too fast into the wings after it's full? I've noticed that if I'm grounded for a few days, the header bleeds slowly into the wings but it takes 10 days or so until the float gauge starts to indicate that the header is almost empty. What's keeping the fuel from heading straight to the wings from the header and emptying it more quickly after a flight?

Chris

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