Nice one sgieldon. If I had had this info before I did the dual mod, I might have gone that way. Months back I was looking for a good alternative solution for the stock filter, but nobody came forward with anything much. Oh well, better late than never... :)

Kentetsu;
I did this filter upgrade about a year ago and after reading your writeup thought I 'd Post these Pics.
I just found them in my collection or I would have Posted them when you first got started.
Your way will work just as well.
sgieldon
steve

No prob man. If nothing else, this thread is turning into a nice referrence for alternative fuel filters. There have been a few nice suggestions so far.

where did you buy that?

^^^ +1

Does the element just screw in like a oil filter? Thats what it looks like to me, if so thats bad azz!

Just trying to understand.
 

Hey Kentetsu,

I'm not trying to diss anything (please don't get offended) seeing as you have a ton of knowledge about this vehicle. How would two fuel filters allow the fuel to flow better? If anything, wouldn't it impede the flow of fuel? I imagine it would filter better though. I mean, having to pass through two inlet/outlets would restrict flow rather than allow more of it, correct? Maybe I missed something while reading your posts. If so, please correct me because I'm interested in this.

Thanks,
Alexander Hipple

Hey Alex, no problem man. The idea behind this is that each filter only has to flow half as fast as one filter would. The stock filters on these cars can cause fuel delivery issues, even if only a little dirty, due to the restriction as the gas tries to flow through the filter. It is my belief that with the stock fuel pump (which is barely adequate) and a stock fuel filter (which is also barely adequate) even when the filter is clean you are at the bottom end of what is acceptable.

I think if we ranked the causes of issues that people have with these cars, dirty fuel filters would be right up there at the top of the list.

So, using two filters in parallel (rather than in series, which would only make things worse) you are going to be able to run those filters for a much longer period of time before they begin restricting the system. Each filter only has to flow at half speed this way. You will not get better filtration this way (unless it was due to the fuel flowing at half speed through the filter), but you will reduce the restriction in the system by 50%.

Now, if I was running them in series (every drop of gas flowing through two filters) then you would indeed be adding restriction to the system, but as you stated you would get better filtering.

The last time that I changed the filter was because I felt that the car was running a little slow. When I got under the car, the filter looked clean so I almost didn't bother changing it. In the end I figured the car is already up in the air, I already have my tools out, and I already have the new filter, so I went ahead and swapped it out. On my next drive, there was a noticeable difference. That is what got me thinking about doing this. If a used (but still clean) filter was causing that much of a power loss, then there was definitely room for improvement. I don't like running equipment that is "barely adequate" for the application.

Anyway, I hope that this answers your questions. If not, let me know. :)

Yup, I knew that I missed something while reading through your initial explanation of this mod. I didn't realize you were running these filters in parallel. I don't know why I figured that anybody who knew what they were doing and wanted to increase the flow of anything would run two of anything of the same size in series. See, this is why I need to slow down and think things through a few times. Anyways, that's an awesome idea and I will re-read your post to see how you did it (again, just to make sure I fully grasp this concept) and then I will probably go ahead and perform this modification on my own car. Awesome work, man!

Regards,
Alexander Hipple

Great info guys, very helpful, esp to me (just bought a 85 Gs). For a 12a, correct me if I am wrong, stock there is only one fuel filter by the gas tank? I think it prob needs to be changed, having some issues starting, but actually running too rich. Anyways Thanks!

Ryan

One filter by the gas tank, and two screens at the carb. A bad filter will usually show up on hard running, such as;

1st gear good power to redline
2nd gear also good all the way to the red
3rd gear, at some point she just dies off until you let up.... because you've just used up all of your reserve all the way back to the filter and now your pump is sucking hard to get the gas through.

An extremely bad filter will, of course, show up earlier in the process (like maybe in 2nd gear rather than 3rd).

Thanks man, and those two filters at the carb should still be there right? hopefully(previous owner put in a 650 Holley)

hey ken search out the pics of my dual filter setup in the 1st gen section under "66 turbo baja".

I did kinda the same thing for my 12a powered baja. I am in the final stages of the turbo project.

I run dual vw corrado filters, I think 95. Anyways the filters are big and flow alot of volume. the main reason I went dual is my gas tank sits directly above them and gravity feeds the two side by side filters. these filters are about the size of soda cans. well since my car is for offroad and on, and sand dunes, it will be seeing some pretty steep climbs and bumps. well the fuel tank gets to where the fuel outlet might not see any, so the filter on mine will also act as a reserve.


remember if you upgrade fuel componets you HAVE to do them all to match the same ID hose and pipe, or its not even worth it.

Those cheapo plastic filters have been used by almost every car manufacturer and seen almost every racetrack in the world. If you look you can cut the ends closer to the inside and drill them out a little by hand with a bit and blow threw them to clean and they flow a little more.

good work

Those are some impressive filters, but are they for fuel injection? FI runs at so much higher pressure, I wasn't sure what the flow would be like at our pressure levels...

The two filters mentioned are actually just screens located under the hardlines on the carb. If you have a Holley on there, then don't worry about it. Even on a Nikki carb, they are not exactly necessary.

The two filters mentioned are actually just screens located under the hardlines on the carb. If you have a Holley on there, then don't worry about it. Even on a Nikki carb, they are not exactly necessary.

Alternate Fuel Filter
 

Pictured Fuel Filter Numbers Are:
Summit Racing
SUM-G1503 Street Strip Fuel Filter 2.44 Diameter= $30.99
Replacement Element
SUM-G1503-SK =$9.88

I also run the Russell inline filter before the Reg.

I'm PreMixing with Redlne Racing 2cycle Oil @ 1oz per gal and yet to see any Residue or other garbge in the fuel system.
As per changing the element in the top of large container there is a 5/8 bolt @ the top of the canister you unscrew and everything comes off as a unit.
The cool part is that you don't have to clamp off the inlet or outlet hoses so you wno't have Gas all over your arms and driveway.
Takes all but 10mins to do the hole change out.

If you have a Carquest Auto Shop in your town they sell the exact Filter as Summit Racing.
Same Package and only $28.50 for the Filter and $4.99 for the Replacement Element w/ Gaskets included.
Filters down to 10Microns.
My friend that runs a 13B in his sand rail has this same setup and never has any had any problems with crap getting into the lines.
steve
sgieldon

i went to go buy that^^^ set up today from carquest.

well after talking to the guy for a while and him bringing me all the 10 micron fuel filters he has plus even one 7 micron filter i bought this set up. it was a lot more pricey then the previous one posted, but i needed one now so im pleased. the other ones they had available was one that was about 14" long and about a 5" diameterand would have definately hit the ground, and one that was 12" long and 2" in diameter(7 micron filter) and it would have just been too long to go to where im putting the carter.

oh yeah, the guys likes rx7s also;) he said he used to have a second gen N/A and his friends a T2 and he loved them.

https://www.rx7club.com/attachment.p...d=172057&stc=1

https://www.rx7club.com/attachment.p...d=172058&stc=1

I also use a clear glass filter at the carb with the removable screens. I use a cheap $2 Fram filter by the tank, it is clear plastic. In my DD I run a duel Fram filter setup, with it being so cheap I just replace them at my leisure. I like the look of the clear filter on the carb. It might not pass a tech inspection, but then again we dont have those here, and if we did, its 25 years old. So in Ohio it is a classic car :)

Oh and Steve when you come down here to pick up the red one, you should make an effort to come with me to see my other 7, it is stored about 15 minutes from my home, It is well worth the trip :)

AWS140, Tell me more about this set up, it looks like an oil filter, but its for gas.

I like the fact that you just screw it on and off, no bolts to undo and such.

Give me more info! lol

this setup has something the mount/pedestle which would be easily install on the drivers side body rail. can also he mounted at any angle. then you get the adapters plus tips to use 3/8 fuel line and then the filter itself. the filter filters down to 10 microns. i asked him if it was in fact a fuel filter and he said no it was was for fuel, not oil. i asked him about how often he thought it needed to be changed and that i just planned on doing it whenever i felt a power loss. he said he didnt think id ever have to change it do to its size. i have a kind of dirty gas tank and i feel really comfortable with this set up. i plan on hopefully installing it and my pump today. if i do ill take pics.

oh yeah, the filters are only $7 a piece

Cool, one more thing

Got any parts numbers for me

Thanks

Matt|ttaM

part numbers:

base= CFI 89309
fuel filter= CFI 89006

will be pics up either later today or tomorrow of the stuff installed. i got it installed yesterday i just need to go get a few different fittings and some more line.

neat idea there, lol, i run a similar setup, but use dual filters to dual pumps. FYI 3/8 fittings for PEX tubing are super cheap at any big box hardware store and work perfectly.

isaac

pics. you can look in the pics and see how i used pieces of hose between the bracket and frame rail to dampen the noise

The Chrome & Red Fuel Pump from Carquest

Filter=10102 Flows 125GPH @7PSI 10Micron
Replacement Element=10122 w/Rubber Gaskets included.
Capacity=1 Pint

As you can see in the Pic's in my previous post I mounted it up high up on the rail and completly straight using 45% 3/8 brass fittings. Helps using 45% fittings! (No bends in the hoses).
sgieldon
steve