fuel filter questions
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Fleet Owner
Joined: Dec 2000
Posts: 25,431
Likes: 5,442
From: Central PA
fuel filter questions
Is it better to have the fuel filter before or after the fuel pump?
Also, is it OK to have 2 fuel filters, one before and one after the pump, or is it too hard for the pump to push and pull fuel through 2 filters?
Also, is it OK to have 2 fuel filters, one before and one after the pump, or is it too hard for the pump to push and pull fuel through 2 filters?
Laughing Gas
Joined: Jun 2007
Posts: 815
Likes: 29
From: Richland, WA.
On my Y-block there has been a filter before the pump for ever. I changed to a glass filter because I need to pull clean and seal tank. I keep extra elements in glovebox. Not sure if it's good for pump but dad put one inline before pump back in 1970's. Don't know if that helps. I'm sure someone will be along to say don't do it. It just always seems when I do something, it's wrong 
and people love to tell me about it. You can ask my wife she'll tell you. LOL.
and people love to tell me about it. You can ask my wife she'll tell you. LOL.
Lead Driver
Joined: Dec 2012
Posts: 9,750
Likes: 823
From: Wentzville, MO
Someone asked a question similar to this a few months back. I basically said use the filter on the pump (if there is one still) and put an inline from the pump to the carb. Use rubber fuel line to help lessen the chance of vapor-lock. I use a clear (see through) so I can see if there's any trash in the fuel. I got sorta 
over my post but like was said above IMHO you can't get your fuel too clean. As far as the wear on the pump I know guys that have run with filters after the fuel pump for 30-40 years. Many of the auto manufactures back in the 70s had filters that screwed in right at the carburetor! Some even had dual filters, before and after the pump from the factory.
over my post but like was said above IMHO you can't get your fuel too clean. As far as the wear on the pump I know guys that have run with filters after the fuel pump for 30-40 years. Many of the auto manufactures back in the 70s had filters that screwed in right at the carburetor! Some even had dual filters, before and after the pump from the factory.
oldmerc
Joined: Jul 2011
Posts: 1,538
Likes: 5
From: Edmonton,Alberta
Truth be told I had three with the old tank . One right after the tank second is the sediment bowl at the pump third is a small see through unit between the pump and the carb . After I get the new gas tank I will eliminate the first one I think .
Laughing Gas
Joined: Jun 2011
Posts: 1,041
Likes: 54
From: Sterling CO
My electronic fuel pump claims that it voids the warranty if there is no filter before.... so a filter before is absolutely mandatory by some standards. (I have a filter before and after - no issues with pressure)
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