As many long time Rotax owners know, there is always continuous research and development at the Rotax factory. Even tried and true products, like fuel pumps, are constantly being refined. However, this new fuel pump change was made because the factory listened to owners who wanted a simpler solution when it came time to replace their fuel pumps. In order to understand this, we need to go back to the last fuel pump release. There were two models. The 893110 and the 893114. The basic difference between the two was that one (892456) came with hoses attached and the other model did not.
Sounds simple right? Well not quite. If you are an owner of an aircraft that is registered as a Special Light Sport Aircraft (SLSA) and needed to replace your fuel pump, according to regulation, you have to replace the part with the exact same part number. That is both a feature and a drawback to SLSA registration. The aircraft manufacturer chooses what works best in their aircraft and application. As a safety feature, owners must use these parts and are not allowed to replace them with anything else, unless they have written approval from the manufacturer. This was very costly to 893114 owners, as they had to buy the fuel pump with the hoses, even though you just needed to replace the pump.
Rotax agreed and have now introduced the 893115 fuel pump assembly. The part is just the fuel pump and there are adapters to make both previous models fit the single pump. By changing to this assembly and choosing the correct fittings, owners can now just replace the fuel pump if needed.
SPECIAL NOTE HERE: SLSA owners must still get a letter of approval from the aircraft manufacturer prior to changing to the new pump. Also Rotax recommends that the technician doing the installation have an Maintenance Level or higher iRMT rating.
Before we jump in and show you the new pump, it is important to have the proper information. To get this you need to go to http://www.flyrotax.com/customer-serviceImpressum/technical-publications.aspx, click on the document type dropdown and choose Service Instructions. Click “Search Database”. A whole list will appear, but if you click date at the top, it will arrange them from newest to oldest. Look for Running Modifications on the Rotax engine type 912/914 (Series) – SI-912-020R7 or SI-9149-022R7.
Now that you know where to find the information, let’s have a look at what we need to select the right parts.
Step One: Identify Current Part Number
First, you need to know the part number of your existing fuel pump. This is a six digit number located on the pump body. Do not confuse this with the Serial Number which has a point after the first two digits.
Step Two: Choosing the right Parts
Next, locate the correct parts list using the part number you have just located on the pump. If 893110 use this one.
Or if 893114 use this one.
Step Three: Part Introduction and location of Installation Instructions
As you can see the fuel pump looks similar to the previous one. Except for the obvious two threaded boxes at the top.
The new pump also comes with some very specific installation instructions. Be sure to read the installation overview in SI-912-020R7
and SI-914-022R7, and note that it also tells you to use the latest Heavy Maintenance Manual. So make sure that you download the newest copy.
