Adding two Fuel inline filters?
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From: Elk
Adding two Fuel inline filters?
Ok so i need to replace the fuel line at the Aux and Main tank Diverter. I'm wondering what you all think about the addition or two small inline filters there. so that basically there is a filter for each tank then one for the main pump.
Senior User
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I would stick with the one in the engine bay. Easy access to change and no modification to fuel system in or under the cab. Safety issue.
Hotshot
Joined: Mar 2013
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From: Phoenix, Az.
My gut feeling tells me to Not do it. I am not the engineer type. Cougarjohn or Ultraranger may have better insight than me. There has to be a reason Ford never put a filter behind a mechanical fuel pump. I am assuming has something to do with either the pump's suction or air getting trapped in the filter(s) and impeding flow.
Fleet Owner
Joined: Dec 2009
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From: NorCal
A pre-filter (with large orifices to catch large debris) in addition to a standard filter would be acceptable IMO.
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From: Elk
Talked to the lead mechanic at the ford dealer up the road from me. he is the one who advised me of installing the two inline filters stating that it will help catch the rust and crap in the tanks until they're used to being run again. he said that I can keep them or remove them later on once junk is out. I'll try it and see how it goes for a few months then remove them.
Posting Guru
Joined: Jul 2011
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From: DFW Texas
There is no reason you can't put filters in that location. Probably a good idea if u have a dirty tank. However, I would spend a little money and put a reusable/cleanable canister filter in the single line.
Logistics Pro
Joined: Jun 2003
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I have a 100 micron fuel filter under the bed at the Mustang gas tank and a 40 micron filter just before the carb.
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Lead Driver
Joined: Apr 2011
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From: El Dorado, Arkansas
I had read some years ago that putting a filter in front of the pump (on carbureted engines, not fuel injected engines) increases the probability for vapor lock.
I don't know if that is fact but, in a carbureted engine, that part of the fuel line is under vacuum (and head pressure of the gas tank) with the fuel pump sucking the fuel from the tank to the pump.
In a fuel injected setup, the fuel at that point is roughly at 100 PSI with an electric fuel pump that's pushing the fuel, under pressure, from the tank to the injectors of the engine.
I don't know if that is fact but, in a carbureted engine, that part of the fuel line is under vacuum (and head pressure of the gas tank) with the fuel pump sucking the fuel from the tank to the pump.
In a fuel injected setup, the fuel at that point is roughly at 100 PSI with an electric fuel pump that's pushing the fuel, under pressure, from the tank to the injectors of the engine.
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Fleet Mechanic
Joined: May 2001
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From: Cupertino
I can think of two reasons why Ford put the filter after the pump:
1) Changing a filter before the pump will lead to fuel being poured on the mechanic,
2) Placing the filter after the fuel pump will trap any debris from a decaying diaphram and keep it out of the carb.
I have always put one in both places.
1) Changing a filter before the pump will lead to fuel being poured on the mechanic,
2) Placing the filter after the fuel pump will trap any debris from a decaying diaphram and keep it out of the carb.
I have always put one in both places.
Lead Driver
Joined: Jul 2011
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From: On the Edge of the Desert
I have a 20 micron see through plastic filter right before the pump, and the factory style gold steel 10 micron filter at the carb.
As long as you keep the pre pump filter clean you won't have an issue. However I would use just one filter under the hood. Easier to change and will do the same thing.
As long as you keep the pre pump filter clean you won't have an issue. However I would use just one filter under the hood. Easier to change and will do the same thing.
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GeneStoner
Ford Inline Six, 200, 250, 4.9L / 300
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Jan 13, 2003 07:22 PM
