grobb284

iTrader: (9)

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?

TomH

iTrader: (1)

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

ssduane

iTrader: (3)

Not clear, but used a 20 buck open/cleanable filter from Summit, think its either a 20 or 40 micron filter with -6 fittings on both ends.

TomH

iTrader: (1)

I would not recommend using a filter that fine in front of the pump for the restriction/cavitation reasons noted above.

LS1GMCTruck

iTrader: (2)

I agree. The Vette filter will take care of the finer debris.

grobb284

iTrader: (9)

Any other filters recommended from personal experience?

Andy1

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

Pop N Wood

iTrader: (1)

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.

TomH

iTrader: (1)

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.

LS1NOVA

iTrader: (12)

Racetronics says the factory filter sock on a walbro gerotor pump is 30 micron.

Andy1

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

grobb284

iTrader: (9)

Andy1,

Seems you are on the right track.

What are some of the larger in-line canister types with 40 microns? Any brands and part numbers?

babydeuce

iTrader: (24)

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

grobb284

iTrader: (9)

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.

TomH

iTrader: (1)

Most filter socks are in the 100-200 micron range. Used in in-tank setups, the filter area is quite large, so they can scale them to match the restriction and flow. For an in-line setup you can go with 6-7" filter canisters to accomplish the same objective. But why?

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.

LS1MCSS

iTrader: (18)

Aeromotive recommends a 100 micron filter before the pump.

Pop N Wood

iTrader: (1)

Whew man. That looks like a good deal. Wish I had known about that brand. The one I bought was closer to $80.

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.

babydeuce

iTrader: (24)

Got your PM, figured I would just post here...

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