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Old 06-08-2008, 01:22 PM   #1
68alltheway
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fuel filter??

fuel filter before or after fuel pump????
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Old 06-08-2008, 01:24 PM   #2
redhead69
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Re: fuel filter??

After. Just dont run a glass one. In the engine compartment is easier to work on also.
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Old 06-08-2008, 01:58 PM   #3
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Re: fuel filter??

There seem to be differing opinions on this from time to time, some say before and some say after.

I run mine after the fuel pump because I have heard running it before the fuel pump can cause vapor lock.

No matter what a metal fuel filter is the best, they tend to hold up better and don't break or melt.

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Old 06-08-2008, 02:07 PM   #4
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Re: fuel filter??

http://67-72chevytrucks.com/vboard/s...ht=fuel+filter
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Old 06-08-2008, 02:43 PM   #5
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Re: fuel filter??

after the pump.
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Old 06-08-2008, 03:52 PM   #6
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Re: fuel filter??

Both. I like to run an inline filter between the tank & pump. Then have a filter in the carb inlet. If you have a brand new tank it's not necessary for one from the tank to the pump.
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Old 06-08-2008, 04:22 PM   #7
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Re: fuel filter??

Quote:
Originally Posted by Wrenchbender Ret View Post
Both. I like to run an inline filter between the tank & pump. Then have a filter in the carb inlet.
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Old 06-08-2008, 04:35 PM   #8
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Re: fuel filter??

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Old 06-08-2008, 04:47 PM   #9
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Re: fuel filter??

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Old 06-08-2008, 07:35 PM   #10
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Re: fuel filter??

before the pump if you are running an electric... after if mechanical.
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Old 06-08-2008, 09:27 PM   #11
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Re: fuel filter??

you can pump sand through a mechanical pump and it won't phase it
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Old 06-08-2008, 10:40 PM   #12
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Re: fuel filter??

Whats the reasoning behind putting a filter before a electric pump? If you are driving a chevy newer model which has a in tank unit fuel pump it's filter is after the pump.
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Old 06-08-2008, 11:20 PM   #13
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Re: fuel filter??

Quote:
Originally Posted by Sammy View Post
Whats the reasoning behind putting a filter before a electric pump? If you are driving a chevy newer model which has a in tank unit fuel pump it's filter is after the pump.
Im just quoting what Holley recommends

http://static.summitracing.com/globa...199r7914-2.pdf

scroll down to page 2. They actually recommend you run a T fitting with TWO filters before the pump - that just seems like plain overkill. But, a 5 dollar pepboy steel filter is some cheap insurance and keeps its unsightly arse out of my engine bay.
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Old 06-09-2008, 10:48 PM   #14
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Re: fuel filter??

Quote:
Originally Posted by chevy72blu View Post
They actually recommend you run a T fitting with TWO filters before the pump - that just seems like plain overkill.
With a set-up like that fuel would take the path of least resistance, thus if one filter started clogging, it would use the other until the resistance equaled that of the other, then it would swap back, and again, and again.. Makes no sense unless someone just wanted twice the filter capacity. If that's the case, run a larger capacity filter.

Maybe I'm reading it different than is intended though.


Jay
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Old 06-09-2008, 10:59 PM   #15
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Re: fuel filter??

Quote:
Originally Posted by Sammy View Post
Whats the reasoning behind putting a filter before a electric pump? If you are driving a chevy newer model which has a in tank unit fuel pump it's filter is after the pump.
they have sock type screen filter that fuel has to go thru before entering the actual pump
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Old 06-09-2008, 12:28 AM   #16
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Re: fuel filter??

I wonder if thats just a way to say warranty void in case their pump fails? Extra insurance sorta deal. I read that Thanks. I wouldn't put a dual filter setup unless I was running a drag car or the indy 500 or an airplane. One filter should be plenty on most applications.
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Last edited by Sammy; 06-09-2008 at 12:36 AM. Reason: revised
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Old 06-09-2008, 07:27 AM   #17
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Re: fuel filter??

Edelbrock also says my warranty is voided if I don't have a filter before the pump on my TBI system
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Old 06-09-2008, 10:04 PM   #18
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Re: fuel filter??

Don't most EFI systems still use a "sock" or strainer of some type before the pump? I think as long as the pre-pump filter has little to no restriction, it won't tend to cause vapor-locking or cavitation.
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