Fuel filter should go before or after fuel pump? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 09-11-2011, 11:06 AM
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Fuel filter should go before or after fuel pump?

should I protect the fuel pump with a filter before it?

or dirt will just go trough it's valves?

chevy stock mechanical pump, holley 4160 carb.

thanks for your opinions.

Augusto.

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Old 09-11-2011, 11:18 AM
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I like to run a large canister fuel filter at the tank then a smaller screen filter right before the carb.
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Old 09-11-2011, 11:25 AM
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I have this LUCAS canister style fuel filter that I was thinking of using, just like you say, this thing is for diesel fuel, would it work with gasoline?
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Old 09-11-2011, 11:26 AM
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I don't run that big of a filter, its an in line stock filter.
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Old 09-11-2011, 11:47 AM
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actually is not that large, say the size of a PH3614 oil filter (like most import small oil filters) but it has the clear vessel that lets dirt sediment before it reaches the paper filter.

it's about the best filter there is but my concerns are about fuel flow due to the fact that it was designed for diesel fuel, it feeds large Caterpillar diesel engines, it should be enough for a thirsty SBC, or shouldn't?
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Old 09-11-2011, 11:51 AM
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as long as it will flow enough fuel I don't see why it wouldn't work.
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Old 09-11-2011, 07:30 PM
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Most fuel pump companies reccomend a fuel filter after the pump so the fuel pump always has fuel,I asked about debris in the pump the said it was not a problem,i usually run 2 filters one before the pump and one before the carb and then the filter in the carb if it is a holley or q jet
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Old 02-09-2012, 01:46 AM
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I've actually been told by multiple people that using a filter before the pump had potential to cause a low pressure area before the pump and increase chances of vaporizing fuel in the lines
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Old 02-09-2012, 05:12 AM
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Ayuh,.... Fuel pumps don't like Crud, 'n Water anymore than carbs do....

On boats, We use filters that look like the picture in my post, 'n they're ALWAYS Before the fuel pump, Period...

If ya get a low pressure area before the fuel pump, it's because the fuel Filter, needs Changin'....

'n, Yes, a diesel fuel filter will pass gasoline, Just Fine...
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Old 02-10-2012, 05:17 PM
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Quote:
Originally Posted by bondo
Ayuh,.... Fuel pumps don't like Crud, 'n Water anymore than carbs do....

On boats, We use filters that look like the picture in my post, 'n they're ALWAYS Before the fuel pump, Period...

If ya get a low pressure area before the fuel pump, it's because the fuel Filter, needs Changin'....

'n, Yes, a diesel fuel filter will pass gasoline, Just Fine...
totally agree with you, thanks for posting
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Old 02-12-2012, 10:44 AM
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fuel filters

After installing your fuel filter, check the fuel pressure after the pump to make sure there is no restriction. A 40 micron filter can be used before the carburetor.
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