AFP inline fuel filter or gascolator?

[Kahuna]

You must put the filter on the low pressure side of the pump. The filter is as much for the pump as it is the injectors. The pump will fail MUCH sooner with no filter and will last much longer with a replacement filter element to a finer mesh. I have been around this bush more times than I care to remember.

The 25 micron ( 0.001") filter element for the Flow Ezy Model 6 ILA
filter (as supplied by AFP and Vans) is part number 8504-05. Price on Flow
Ezy's web site shows a price of ~$40. This is a direct replacement for
the stock 174 micron element. FYI Bendix mandates a filter element of no
more coarse than 74 microns. Want to do it right? Get the 25 micron filter element replacement and put the filter on the low pressure side of the pump. I know $40 seems like a lot. But it wont when your pump fails in the field.
You can find the 6 ILA filter here.

http://198.170.245.162/flowezypagehy...EIN-LINEFILTER




To add to the information, a direct replacement fuel pump when your on the road to the AFP pump is a Carter fuel pump part number P74015. You can pick these up at your local auto parts store and should be around $120 in the field. It will get you back in the air.

Best

[JonJay]

Very impressive and usefull information. Should be included and supplied by AFP and/or Vans when we buy these things. I intend to print this out and add it to my OM.

[Bubblehead]

Since my -8 does not currently have a filter, just a gascolator, I would need a filter with bracket, either:

6ILA-03-25-U for Buna seals, or
6ILA-03-25-F3-U for Viton seals

What seal material is best for av gas?

I assume I need a 3/8" NPT port? (the "03" in the code above) and would use two AN 816-6-6D aluminum flared tube and pipe thread nipples to connect the filter to the fuel line.

Does it sound right or am I missing something?

[Dean Pichon]

I'm planning to re-locate the fuel filter in my -4 and have followed this thread with interest. According to my AFP manual, the filter supplied is 125 micron. I am concerned that a 25 micron filter could generate more of a pressure drop than the pump can handle and reduce flow to the engine. Has anyone been running a 25 micron filter?

Thanks,

Dean Pichon

[Walt]

Even though I have a carb, I installled a 74 micron prefilter after the selector to keep trash out of the pump and fuel flow sensor. I'm not sure it's a great idea to install too fine a filter in the suction line and 74 is the recommended size from what I could find out. I also have an Andair gascolator on the firewall.

[Kahuna]

Originally Posted by Dean Pichon

I'm planning to re-locate the fuel filter in my -4 and have followed this thread with interest. According to my AFP manual, the filter supplied is 125 micron. I am concerned that a 25 micron filter could generate more of a pressure drop than the pump can handle and reduce flow to the engine. Has anyone been running a 25 micron filter?

Thanks,

Dean Pichon

Yes, and on an IO-540.

[allbee]

Originally Posted by L.Adamson

And Van's prefabed fuel pickups, have a good stainless steel straining screen to start with.

L.Adamson

and when they plug up you do what?

[flyeyes]

I talked with AFP several years ago about this.

They were comfortable at the time with the Andair gascolator (which has a much finer screen) as the only filter in the system.

In my -8, I put the gascolator in the left wing root, after the fuel selector but before the boost pump. This has worked well to date and is trivial to service.

[Kahuna]

Originally Posted by Bubblehead

Since my -8 does not currently have a filter, just a gascolator, I would need a filter with bracket, either:

6ILA-03-25-U for Buna seals, or
6ILA-03-25-F3-U for Viton seals

What seal material is best for av gas?

I assume I need a 3/8" NPT port? (the "03" in the code above) and would use two AN 816-6-6D aluminum flared tube and pipe thread nipples to connect the filter to the fuel line.

Does it sound right or am I missing something?

Viton seals. And the rest is correct.
Sorry for not replying back sooner.
I do not recommend gascolators.
Best

[whifof100ll]

Originally Posted by Kahuna

You must put the filter on the low pressure side of the pump. The filter is as much for the pump as it is the injectors.

Thanks for this post. Very good info and a bit contrary to my prior thinking. I see your point about pump protection.

I originally wanted to install one filter in each wing root for servicability, but then was concerned about leaks. I thought it might be best to have as many couplings (read potential leak paths) on the HP side of the pump. In this manner, a leak would be noticed. If you get a leak on the LP side, you will be sucking air into the system and would not likely find it the easy way.

Thoughts?

Also, can you (or anyone) comment on suitability of Viton o-rings for use with Mogas with alcohol. Not that I plan on burning such, just wanting to cover all potential emergency fuel options.

Regards,