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11-07-2015, 06:00 PM
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CC Member
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Join Date: Feb 2012
Location: Keller,
TX
Cobra Make, Engine: Lonestar Classics LS427. Self-built 408W, AFR 195 heads, Performer RPM Intake, Quick Fuel 750, 407rwhp, 479rwtq
Posts: 549
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Not Ranked
Fuel Pump Pre-filter options
Went out to the track today but didn't get to run. I'm pretty sure I got some bad/dirty fuel and that clogged the pre-filter and has damaged my fuel pump. I have ordered a new pump but have a question about the pre-filter.
Is there any reason I can't use those $10 glass filters from Mr. Gasket that I can get at O'Reilly as a pre-filter? They say "Not for use with EFI" but I'm thinking that means "post-pump" due to the higher pressure. In a pre-filter setting there is no pressure, only a small amount of vacuum that will vary depending on how dirty the filter actually is.
The other option is the $70 Holley reusable billet filter. It would be nice to use the glass one to visually check to see if it needs cleaning.
Last edited by Texasdoc; 11-07-2015 at 06:02 PM..
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11-08-2015, 02:42 PM
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CC Member
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Join Date: Feb 2012
Location: Keller,
TX
Cobra Make, Engine: Lonestar Classics LS427. Self-built 408W, AFR 195 heads, Performer RPM Intake, Quick Fuel 750, 407rwhp, 479rwtq
Posts: 549
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Not Ranked
Pump and filters are external. I guess I didn't say, but I figured my question on using an external pre-filter would have meant that my pump was also external. There is an internal baffle to prevent starvation on corners. Not sure how to use the mat on a tank with internal baffles. Also, not sure how it would have helped my situation - bad fuel clogging my pre-filter, damaging my pump.
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11-08-2015, 03:16 PM
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CC Member
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Join Date: Feb 2009
Posts: 1,690
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Not Ranked
Surface area. The more surface area you have, the less chance of clogging the filter. The Holley mats have a huge amount of surface area and they pull from multiple locations within the tank.
Personally, I would start buying gas from another source. 35 years of driving and I have never had that much dirt in any gas I bought.
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11-08-2015, 03:49 PM
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CC Member
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Join Date: Oct 2000
Location: Crystal Lake,
IL
Cobra Make, Engine: Everett-Morrison, 434 cid
Posts: 977
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Not Ranked
Quote:
Originally Posted by Texasdoc
Is there any reason I can't use those $10 glass filters from Mr. Gasket that I can get at O'Reilly as a pre-filter? They say "Not for use with EFI" but I'm thinking that means "post-pump" due to the higher pressure. In a pre-filter setting there is no pressure, only a small amount of vacuum that will vary depending on how dirty the filter actually is.
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Those don't have the surface area or the micron rating for use as a pre-filter. I like and use Aeromotive 100 micron pre-filter and 10 micron post-filter.
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11-08-2015, 06:15 PM
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CC Member / Sponsor
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Join Date: Jan 2002
Location: Provo,
UT
Cobra Make, Engine: Daytona Coupe
Posts: 1,356
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Not Ranked
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11-13-2015, 07:45 AM
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CC Member
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Join Date: Feb 2012
Location: Keller,
TX
Cobra Make, Engine: Lonestar Classics LS427. Self-built 408W, AFR 195 heads, Performer RPM Intake, Quick Fuel 750, 407rwhp, 479rwtq
Posts: 549
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Not Ranked
Quote:
Originally Posted by scottj
Those don't have the surface area or the micron rating for use as a pre-filter. I like and use Aeromotive 100 micron pre-filter and 10 micron post-filter.
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Got it. Makes sense. I've ordered the Holley Billet pre-and post filters.
Weird tho - Holley makes one of the smaller/cheaper fuel filters they market specifically for EFI (Part 562-3).
I'll get it installed next week and hopefully get it back out on the road a few more times before the cold weather sets in.
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11-13-2015, 11:41 AM
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Member of the north
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Join Date: May 2003
Cobra Make, Engine: A Cobra
Posts: 11,207
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Not Ranked
I'll chime in.
My GT40 has a fine filter after the check valve, but before the fuel pump. As I recall it is a 10 or 20 micron paper element housed in a billit aluminum can with AN6s ( might be AN8s ) on each end.
When pumps are hundreds of dollars, I believe the filter needs to be before the pump.
Just an opinion, I hope this helps.
__________________
I'm a writer, feed the artist and buy a book.
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11-13-2015, 12:10 PM
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CC Member
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Join Date: Feb 2012
Location: Keller,
TX
Cobra Make, Engine: Lonestar Classics LS427. Self-built 408W, AFR 195 heads, Performer RPM Intake, Quick Fuel 750, 407rwhp, 479rwtq
Posts: 549
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Not Ranked
Right. I have a 100 micron filter before the pump and a 10 micron filter after the pump. The question was: are the small $10 glass 100 micron filters you can get at O'Reilly good enough for a pre-filter, or is the $75 filter needed.
The consensus is that those small $10 filters, although they have the right micron filter rating, they don't flow enough fuel for an EFI system. They may be ok for carb systems, but are a no-go on EFI.
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11-14-2015, 05:09 AM
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CC Member
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Join Date: Aug 2010
Cobra Make, Engine: Lone Star with IRS, 427W with megasquirt, T56 magnum
Posts: 309
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Not Ranked
It's very important that the pre filter has adequate surface area. it doesn't take much of a restriction to make a EFI pump cavitate, and that's a BAD thing.
I'm using a cheap earl's little inline post filter that actually hangs off the fuel rail. It's just a little sintered bronze (replaceable) element, but it plugs up every 3000 miles. 10 minutes to change, and you get plenty of warning, but changing to a soda can sized fuel lab unit on the frame is on the winter to do list.
Don't skimp on the filters.
Last edited by Luce; 11-14-2015 at 05:11 AM..
Reason: left out BAD
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