Which filter to use ahead of Walbro inline pump.
Which filter to use ahead of Walbro inline pump. I am putting together the fuel pump system for my Studebaker. I have the external pump from Walbro (gsl392), and the filter/regulator from NAPA (3737) to set up like the Corvette returnless LS1.
Since I am using an original fuel tank from the 1980's, I want to use a filter before it gets to the Walbro pump. I'm thinking something that I can pick up from NAPA, not Aeromotive stuff. Something to filter debris, but not starve the pump dry. Any suggestions from practical experience?
Any transparent ones for visual indication of reduced capacity?
Any photos of your fuel system installation?
Since I am using an original fuel tank from the 1980's, I want to use a filter before it gets to the Walbro pump. I'm thinking something that I can pick up from NAPA, not Aeromotive stuff. Something to filter debris, but not starve the pump dry. Any suggestions from practical experience?
Any transparent ones for visual indication of reduced capacity?
Any photos of your fuel system installation?
Last edited by grobb284; Jul 30, 2009 at 06:14 AM.
I use an Earl's 85 micron filter as a pre-filter. 80-100 micron is the target to minimize restriction and cavitation.
Good luck
Good luck
Last edited by TomH; Jul 31, 2009 at 12:08 PM.
TECH Resident
Joined: May 2004
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From: SoCal
As a (coarse) pre-filter for the Walbro inline fuel pump, I'm using an 85 micron Earl's filter from Summit: http://www.summitracing.com/parts/EAR-230206ERL/
Andys
Andys
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Mallory recommends their 40 micron 3175 filter in front of their pumps here
http://www.malloryperformance.com/pd...m_Products.pdf
The summit pump I bought also recommends a 40 micron filter. I am running a 40 micron I think aeromotive filter, only because it as the cheapest in line filter that had the 3/8 NPT fittings I needed.
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Verdad Gallardo Unfortunately a lot of pump manufactures recommend a 40 micron prefilter.
Mallory recommends their 40 micron 3175 filter in front of their pumps here
http://www.malloryperformance.com/pd...m_Products.pdf
The summit pump I bought also recommends a 40 micron filter. I am running a 40 micron I think aeromotive filter, only because it as the cheapest in line filter that had the 3/8 NPT fittings I needed.
Mallory recommends their 40 micron 3175 filter in front of their pumps here
http://www.malloryperformance.com/pd...m_Products.pdf
The summit pump I bought also recommends a 40 micron filter. I am running a 40 micron I think aeromotive filter, only because it as the cheapest in line filter that had the 3/8 NPT fittings I needed.
Interesting, on the Bosh 044's they say 80-100 while the OEM pumps use a simple in-tank sock filter. At 45 micron, you can hear the cavitation noise quite clearly.
Oh well.
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Joined: May 2004
Posts: 792
Likes: 2
From: SoCal
After a second thought on the subject, the filter screen size and its creating a restriction of flow to the pump is proportional to its area. In the case of those small (Summit/Earl's) inline filters, I suspect a 30 or 40 micron filter might not offer adequate flow (volume), whereas an in-tank sock with the same 30 or 40 micron screen with far greater available area my very likely offer no restriction of flow. I suspect that a large diameter in-line cannister type pre-filter at 30 to 40 microns may flow enough fuel, though it would be nothing more than a guess without real data.
Andy1
Andy1
Here is what I use on mine, was recommended by another member. I have been running mine for over a year, no issues whatsoever.
http://www.robbmcperformance.com/products/filters.html
Jack
http://www.robbmcperformance.com/products/filters.html
Jack
Jack,
Did you use the 100 micron or 40 micron? Large size or small filter?
I'm thinking Andy may be right, perhaps if I use the finer (40 micron) filter, go with the larger unit to prevent starvation.
Did you use the 100 micron or 40 micron? Large size or small filter?
I'm thinking Andy may be right, perhaps if I use the finer (40 micron) filter, go with the larger unit to prevent starvation.
The Aeromotive/Earls screen type (cleanable) filters at 100/80 micron are widely used in high performance applications and they work. (i.e. Good pump longevity, easy serviceability, and low noise.)
But, it's your money.
Here is what I use on mine, was recommended by another member. I have been running mine for over a year, no issues whatsoever.
http://www.robbmcperformance.com/products/filters.html
Jack
http://www.robbmcperformance.com/products/filters.html
Jack
Yeah Aeromotive recommends 100 micron. And yet the aeromotive filter I have is a 40 micron. Funny how they all recommend something different
Key is just keep the filter clean and you won't have to worry too much about restrictions. Tear up one $250 pump and expensive filters are going to start looking pretty damn cheap.
I used the short 40 micron Part # 1028. I have it connected directly to the sump on my tank, then to a walbro 255 and corvette regulator. I have a rock solid 58 PSI at the rail under all throttle conditions.
Jack
