• The Biplane Forum is a large global active community of biplane builders, owners and pilots. From Pitts to Skybolts, to older barnstormers, all types are welcome. In addition to our active community, our content boasts exhaustive technical information which is often sought after for projects and maintenance. This information has accumulated over the 12+ years the forum has been in existence.

    The Biplane Forum is a private community. Subscriptions are only $49.99/year or $6.99/month to gain access to this great community and unmatched source of information not found anywhere else on the web. We are also a great resource for non biplane users, since many GA aircraft are built the same way (fabric and tube construction). Annual membership also comes with two BiplaneForum.com decals.

Ellison Issue


Well-Known Member
Supporting Member
Sep 27, 2022
Reaction score
A few months back I purchased an S1S with and Ellison TBI on a 360. I noticed that the overflow line from the fuel pump drips fuel when the engine is shut down. It drips every couple of seconds unless the fuel is turned off. On the Vans forum someone said this is normal with the Ellison. I don’t have a regular lycoming plunger style fuel pump. Looking in get the cowl today it is a rotating pump. I need to remove the cowl and take a closer look.
Is the leak normal? I know for a lycoming pump it is not. And yes I need to find the oil leak too!

Latest posts