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Fuel Filter Location?
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DRR Pro
Picture of Footloose
posted
I currently run a block mounted pump with the filter after it. With an electric pump which way is better before or after the pump and why?
 
Posts: 1621 | Location: in a van down buy the river | Registered: September 07, 2002Reply With QuoteReport This Post
DRR S/Pro
Picture of "The Bender"
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After the pump, electric pumps push fuel much better than pull, you don't want a partially restricted (dirty) filter on the suction side. With the filter on the pressure side a restricted filter won't have nearly as much effect as it would on the suction side.


272" Spitzer
Bednar Racing Engines 540
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Less Boost Than You Think
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Posts: 1941 | Location: Yes | Registered: July 08, 2009Reply With QuoteReport This Post
DRR Sportsman
Picture of Bad News
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100 micron stainless mesh before the pump to catch large particulate, 10 micron after the pump. Eventually foam will deteriorate, hoses will deteriorate and send chunks of rubber to the carb so also use the carb fittings with the screens in them. Check the filters one a month.
And never a paper element before the pump as they are too restrictive.
 
Posts: 706 | Location: ft laud | Registered: September 02, 2004Reply With QuoteReport This Post
DRR Top Comp
Picture of 1320racer
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before, no junk fram paper filter from 1970s, use ay least a cleanable 60 micron element and because you don't need a second filter after the pump with the right filter before it.

Per John Rademacher aka Product Engineering, previously the founder of Magna Fuel which was Magna Flow, previously the founder of Super FLow fuel pumps as well John was the original builder/supplier of BG fuel pumps...

"Should my fuel system contain a filter? If so, what type and where should it be located? Yes, and it should be located between the fuel tank or cell and the fuel pump, never after the fuel pump. Use a filter with a cleanable element, do not use paper element filters."

This message has been edited. Last edited by: 1320racer,


Offering 1st hand experience and advice based on track proven performance, on the web since 1998.

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Posts: 7807 | Location: NJ | Registered: August 20, 2000Reply With QuoteReport This Post
DRR Pro
Picture of Footloose
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If I mount the filter after the pump will trash get into the pump and ruin it? I do strain my fuel into cell. Looking at an Aeromotive pump.
 
Posts: 1621 | Location: in a van down buy the river | Registered: September 07, 2002Reply With QuoteReport This Post
DRR Top Comp
Picture of 1320racer
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potentially YES! again your filter has no business being install after the pump


Offering 1st hand experience and advice based on track proven performance, on the web since 1998.

"if you guys are so broke dyck you can't buy USA made parts you need to stay the fuc at home that's the bottomline" ----Tim McAmis

Support our country! Support our Troops! Support our economy! Buy American!!




 
Posts: 7807 | Location: NJ | Registered: August 20, 2000Reply With QuoteReport This Post
DRR Pro
Picture of Footloose
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I replace pumps in tanks a lot. Newer cars. they have screens under the pump then another filter bolted to the frame,but we are talking about hi-pressure fuel injection. Most of the time the pump burned up because the strainer was trashed up. I also am looking at a mallory 140-which is better that or a aeromotive?
 
Posts: 1621 | Location: in a van down buy the river | Registered: September 07, 2002Reply With QuoteReport This Post
DRR Top Comp
Picture of 1320racer
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I ran a Mallory Comp 140 with the Comp 140 paper element filter BEFORE the pump in a dead headed system in my Chevelle from 1995 to 2007 without issue.


Offering 1st hand experience and advice based on track proven performance, on the web since 1998.

"if you guys are so broke dyck you can't buy USA made parts you need to stay the fuc at home that's the bottomline" ----Tim McAmis

Support our country! Support our Troops! Support our economy! Buy American!!




 
Posts: 7807 | Location: NJ | Registered: August 20, 2000Reply With QuoteReport This Post
DRR Sportsman
Picture of FootbrakeJim
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IMHO, each one of the above replies makes good sense, the most common (possibly overkill?) setup I see, is a large mesh (~100 micron) screen filter before the pump, and a finer filter somewhere downstream of the pump. I agree with Bad News that you should use carb fittings with screens in them, I have found bits of deteriorated rubber in my float bowls, from braided line that was only 3 years old.
Here is something to consider - Not only does an upstream filter protect the pump from any debris that might enter the cell with the fuel, but also through the cell vent. I filter my fuel into the cell, but was still finding small chunks of track debris in my filter. Looked like bits of asphalt, rubber, gravel. Finally figured out it was getting sucked up the vent hose, which is routed along a frame rail below the trunk. Never thought that would happen, but I guess if you suck a gallon of alcohol out of the cell in a 1/4 mile pass, it creates enough vacuum in that vent line to pull stuff up and into the cell.
It made me glad to have the filter before the pump, I added a 3/8" Fram paper see-thru gas filter to the end of that vent, to filter the air getting drawn in. Haven't seen anything in the filter since then. And I have heard of more than one racer down South who had mud wasps plug their vent line, which caused fuel starvation issues down-track, until they finally figured out why their fuel pressure was dropping off at the big end! Eyes Big Grin


Dan "Jim" Moore
This year = "Transbrake Jim"
Much too young to feel this damn old!!
 
Posts: 408 | Location: Dallas, TX  | Registered: December 05, 2002Reply With QuoteReport This Post
DRR Top Comp
Picture of 1320racer
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in the 25 years I've been racing and over 5000 passes I've made on gas, I have never found any trash in my fuel filter from deteriorating fuel lines.


Offering 1st hand experience and advice based on track proven performance, on the web since 1998.

"if you guys are so broke dyck you can't buy USA made parts you need to stay the fuc at home that's the bottomline" ----Tim McAmis

Support our country! Support our Troops! Support our economy! Buy American!!




 
Posts: 7807 | Location: NJ | Registered: August 20, 2000Reply With QuoteReport This Post



DRR Sportsman
Picture of Bad News
posted Hide Post
quote:
Originally posted by FootbrakeJim:
IMHO, each one of the above replies makes good sense, the most common (possibly overkill?) setup I see, is a large mesh (~100 micron) screen filter before the pump, and a finer filter somewhere downstream of the pump. I agree with Bad News that you should use carb fittings with screens in them, I have found bits of deteriorated rubber in my float bowls, from braided line that was only 3 years old.
Here is something to consider - Not only does an upstream filter protect the pump from any debris that might enter the cell with the fuel, but also through the cell vent. I filter my fuel into the cell, but was still finding small chunks of track debris in my filter. Looked like bits of asphalt, rubber, gravel. Finally figured out it was getting sucked up the vent hose, which is routed along a frame rail below the trunk. Never thought that would happen, but I guess if you suck a gallon of alcohol out of the cell in a 1/4 mile pass, it creates enough vacuum in that vent line to pull stuff up and into the cell.
It made me glad to have the filter before the pump, I added a 3/8" Fram paper see-thru gas filter to the end of that vent, to filter the air getting drawn in. Haven't seen anything in the filter since then. And I have heard of more than one racer down South who had mud wasps plug their vent line, which caused fuel starvation issues down-track, until they finally figured out why their fuel pressure was dropping off at the big end! Eyes Big Grin


I used a #8 bulkhead fitting through the floor with a K&N filter screwed on to a #8X3/8 npt adaptor. When the car is on track it gets the filter screwed on, when at rest in the trailer it gets a #8 cap, which stops the fuel from evaporating. Just got to remember to put the filter on at the track, as the cap will seal the tank and it will collapse a tad.
The before tank filter is not overkill for guys that still have foam in the tank. Carbs flooding over into the engine from trash is a pain. Removing spark plus and such.
 
Posts: 706 | Location: ft laud | Registered: September 02, 2004Reply With QuoteReport This Post
DRR Pro
Picture of head gamez
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Mine is in the shop on the shelf... no filter for my alcohol setup.


Mikey Walters
Winston-Salem NC
 
Posts: 1716 | Location: In a Marriott near you! | Registered: February 10, 2006Reply With QuoteReport This Post
DRR Sportsman
Picture of FootbrakeJim
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quote:
Originally posted by Bad News:
I used a #8 bulkhead fitting through the floor with a K&N filter screwed on to a #8X3/8 npt adaptor. When the car is on track it gets the filter screwed on, when at rest in the trailer it gets a #8 cap, which stops the fuel from evaporating. Just got to remember to put the filter on at the track, as the cap will seal the tank and it will collapse a tad.
The before tank filter is not overkill for guys that still have foam in the tank. Carbs flooding over into the engine from trash is a pain. Removing spark plus and such.

Agree, to me the overkill was the filter after the pump. Removed mine, but did add the screened carb fittings. Would like to see picture (or get P/N) of the K&N filter you use on your vent line, I don't remember seeing one with 3/8 NPT female threads? Good idea on the cap to prevent evaporation, would also guard against humidity/moisture on an alky system. Wink


Dan "Jim" Moore
This year = "Transbrake Jim"
Much too young to feel this damn old!!
 
Posts: 408 | Location: Dallas, TX  | Registered: December 05, 2002Reply With QuoteReport This Post
DRR Pro
Picture of Footloose
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Thanks guys I think I will put the filter 1st Smile
 
Posts: 1621 | Location: in a van down buy the river | Registered: September 07, 2002Reply With QuoteReport This Post
DRR Pro
Picture of Eman
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So far every pump manufacturer's diagrams say 100 micron before the pump and 10 micron after, but what do they know? They just want to sell you more stuff!
 
Posts: 645 | Location: E TN | Registered: February 13, 2009Reply With QuoteReport This Post
DRR Top Comp
Picture of 1320racer
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Not every and not the guy and the company that started the trend in the 80's of using high GPH fuel pumps with sewer size fuel lines...

https://www.product-engineerin...es/pump-installation

https://www.product-engineerin...pages/help-us-design


Offering 1st hand experience and advice based on track proven performance, on the web since 1998.

"if you guys are so broke dyck you can't buy USA made parts you need to stay the fuc at home that's the bottomline" ----Tim McAmis

Support our country! Support our Troops! Support our economy! Buy American!!




 
Posts: 7807 | Location: NJ | Registered: August 20, 2000Reply With QuoteReport This Post
DRR Trophy
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Ed I asked this same question to Patrick at prosystems where to mount the filter and he told me after the pump. because I always put them before the pump and he said no after so you can save the carb. the reason I asked him was because I bought a fuel pump off him and on the instructions it said after the pump.
 
Posts: 83 | Location: pa | Registered: December 13, 2014Reply With QuoteReport This Post
DRR Top Comp
Picture of 1320racer
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Kenny, I've never spoken to Patrick about fuel pumps nor have I used them but I disagree with his or anyone else's advice to install the filter after the pump.

IF something gets pass my 60 micron filter the worse case is it will get caught in the needle/seat and that has never happened to me in 25 years and in any of the 3 cars that I have raced.


Offering 1st hand experience and advice based on track proven performance, on the web since 1998.

"if you guys are so broke dyck you can't buy USA made parts you need to stay the fuc at home that's the bottomline" ----Tim McAmis

Support our country! Support our Troops! Support our economy! Buy American!!




 
Posts: 7807 | Location: NJ | Registered: August 20, 2000Reply With QuoteReport This Post
DRR Trophy
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I under stand what your saying ED.
 
Posts: 83 | Location: pa | Registered: December 13, 2014Reply With QuoteReport This Post
DRR S/Pro
Picture of The Bozman
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We put ours before the pump. A needle and seat is easy to fix but a pump is not. We run a 100 micro before the pump.

i prefer the Aeromotive A2000 over the Mallory 140. i like the internal diaphram regulator on the A2000 pump.


Keeping the Socialists and NEO-LIBERALS at bay with FACTS one post at a time !!!

Providing advice based on WINNING CHAMPIONSHIPS AND RACES across the country in door cars and dragsters from 12 seconds to low 6 seconds in both (not a first round by bye-back window regular at the only track I go to). Providing WINNING ADVICE BASED ON FACTS AND PERSONAL EXPERIENCE ON CARS I WORK ON, OWN AND RACE. Not unsubstantiated opinion I came up with sitting on the toilet.
 
Posts: 2807 | Location: Rockwall, Texas | Registered: June 25, 2002Reply With QuoteReport This Post



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