Dual Fuel Filter Mod
#1
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Dual Fuel Filter Mod
Hi guys. I've always figured that one of the biggest restrictions in the fuel system is the whimpy little fuel filters that we have been given. One that is even slightly dirty will have a noticeable effect on overall horsepower at wide open throttle.
No rocket science here, but I figured I'd put together a post anyway that included the part numbers and cost involved. Take a look, and let me know what you think.
Two T fittings = 5.50 each
5' of 5/16" fuel line = 5.00
2 fuel filters = 6.00
To support the entire assembly, I simply bent some coat hanger wire and covered it with some vacuum line to keep it from wearing on anything important. Then I bolted the wire to a spare stud where the original fuel pump cover mounted (in the process of installing a Carter pump now).
No rocket science here, but I figured I'd put together a post anyway that included the part numbers and cost involved. Take a look, and let me know what you think.
Two T fittings = 5.50 each
5' of 5/16" fuel line = 5.00
2 fuel filters = 6.00
To support the entire assembly, I simply bent some coat hanger wire and covered it with some vacuum line to keep it from wearing on anything important. Then I bolted the wire to a spare stud where the original fuel pump cover mounted (in the process of installing a Carter pump now).
#4
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LOL. A few months back I started a post looking for a better fuel filter option. Lots of responses, but no worthwhile information ever came out of it. Now that I go through this little bit of trouble, I start hearing about better alternatives. Figures...
#7
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Originally Posted by jjlrx7
looks cool enough, but what is the benifit? i use a glass filter with replacable inner screens. no more prob. I run a 465 holley. not turbo but works.
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#8
YA looks nice, i use a brass filter right infront of the carb. Its one of those Chrome Red ones for about 25 bucks. i havent changed the rear one, i guess i should. Its been prolly two years since its been done.
#10
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Thats a pretty interesting idea though, definately should help the flow.
And slow down the demise of the filters such as the dirty one in my avatar I pulled when I first got the car.
And slow down the demise of the filters such as the dirty one in my avatar I pulled when I first got the car.
#11
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I considered just getting a larger filter, but it still only has one intlet and one outlet, so who's to say that it will flow better? I'm sure it would filter better (presumably), but flow?
Anyway, using two stock filters will cut the load demand to 50% on each one. So each filter will keep up fine as long as it does at least a halfway decent job. I always felt that the stock filter was just barely able to meet the flow demands of the stock system (if that), so now it only has to work half as hard and I'll still get good flow.
Here's the thread where I first started fishing for ideas on this. https://www.rx7club.com/showthread.p...ht=fuel+filter
Anyway, using two stock filters will cut the load demand to 50% on each one. So each filter will keep up fine as long as it does at least a halfway decent job. I always felt that the stock filter was just barely able to meet the flow demands of the stock system (if that), so now it only has to work half as hard and I'll still get good flow.
Here's the thread where I first started fishing for ideas on this. https://www.rx7club.com/showthread.p...ht=fuel+filter
#12
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i bought one knew fuel filter yesterday (the same one you have in the pics), but i cannot locate where the other one goes, only one of my lines seemed to have a filter on it
#14
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Originally Posted by Kentetsu
Umm, this is a modification to allow the use of two filters for better flow...
i think im gunna run back to the store tonight and get these parts, and try this aswell
#17
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Originally Posted by chedda_j
There is two under the hood on the carb, one on each fuel line, aswell as one under the back of the car, on the chassie.
#18
what about getting a filter for 3/8" lines? it should squeeze into the 5/16" line and flow more. Thats probably what I'm going to be putting on my carb unless anyone knows better. plus my carter was listed as having 1/4" inlets and outlets but these are defenitely 3/8".
what do you guys think about this one on summit. Russel Aluminum
sorry for the hijack and great idea by the way. Gotta love some good ol' ingenuity.
edit: woohoo post #300!
what do you guys think about this one on summit. Russel Aluminum
sorry for the hijack and great idea by the way. Gotta love some good ol' ingenuity.
edit: woohoo post #300!
#20
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http://store.summitracing.com/partde...5&autoview=sku
Considered it an investment in my carb and motor's future. At the end of a day of autocrossing the motor would stutter and run rough. Installed this filter, no more. Crud in tank would come loose and plug carb jets. Even after I relined it myself. Stock lining was still in there and flaked off
Filters MUCH better than the G2 Fram filters. Dropped 0.25psi mesaured at the carb. No biggie, just upped the fuel pressure!
Considered it an investment in my carb and motor's future. At the end of a day of autocrossing the motor would stutter and run rough. Installed this filter, no more. Crud in tank would come loose and plug carb jets. Even after I relined it myself. Stock lining was still in there and flaked off
Filters MUCH better than the G2 Fram filters. Dropped 0.25psi mesaured at the carb. No biggie, just upped the fuel pressure!
#21
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Originally Posted by DriveFast7
http://store.summitracing.com/partde...5&autoview=sku
Considered it an investment in my carb and motor's future. At the end of a day of autocrossing the motor would stutter and run rough. Installed this filter, no more. Crud in tank would come loose and plug carb jets. Even after I relined it myself. Stock lining was still in there and flaked off
Filters MUCH better than the G2 Fram filters. Dropped 0.25psi mesaured at the carb. No biggie, just upped the fuel pressure!
Considered it an investment in my carb and motor's future. At the end of a day of autocrossing the motor would stutter and run rough. Installed this filter, no more. Crud in tank would come loose and plug carb jets. Even after I relined it myself. Stock lining was still in there and flaked off
Filters MUCH better than the G2 Fram filters. Dropped 0.25psi mesaured at the carb. No biggie, just upped the fuel pressure!
#22
Holly ****. Thats tight. You can totally see my filter in this picture, you think that my dirty filter (chassie one) could be robbing that much power? It looks black, and the car is kinda slow. Hasnt been changed for years. i did a coversion chart and it said that i should be running about 18 seconds in the quarter with my setup, im running prolly 22. Thats sad. Gotta work on that ****.
#23
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Change your fuel filter today! You will definitely notice a difference. I have a very clean tank, but even after a couple of months using a filter I will notice a difference with a new one. Less than 4 bucks, and fifteen minutes to swap it out even if you're holding a beer in one hand...
#24
I took your advice and changed the filter, the last one i couldnt even blow through, holly ****, total increase in power. id say 20%, i went to go turn a corner at a normal rate and tapped the gas and it shot me sideways, as where before i would have to turn a corner overly fast and pound the gas.
Oh ya and the car idles, still lopes because i need to do the CP mod, but it runs 10x better.
Oh ya and the car idles, still lopes because i need to do the CP mod, but it runs 10x better.
#25
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Good to hear man! I'm hoping that this dual filter setup will help to keep the power up for a longer period of time between filter changes. This way, even if the filters are flowing at half-rate I'll still have full flow to the carb. I guess we'll see....