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Ontario Rodding Community -> Rod-Tech-Talk -> fuel filter
Post Info TOPIC: fuel filter
Marten


Kemptville Ont Carpenter/Renovations

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fuel filter
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I think I messed up again.  Does it matter where in the fuel system the fuel filter goes?  Between the tank and fuel pump or between the pump and the carb?  I have the mechanical fuel pump if that makes any difference.



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parklane


St.Thomas On Rod-side member

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usually goes between the pump, and carb.

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tc


St.Thomas On member

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X2

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Marten


Kemptville Ont Carpenter/Renovations

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Crap, OK thanks guys. More money needed to be spent

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wuga


Prince Edward County Ont

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I'm sorry, but this is crock. The only reason fuel filters are between the pump and the carb is because it is the easy place to put them. In many cases, the only filter was on the carb inlet and to stop that from getting plugged, a filter was added inline before the carb. Factory fuel filters are generally installed just past the tank to keep crap out of the fuel system. Why would you want dirt etc. going into your pump. Filters can be installed any where you like as the most sensitive to contaminates is the carb, but clean fuel from the tank outlet to the carb is the best.
Marten, you never did say what your configuration is. So before you change it, give us the whole picture.

Warren


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GMDad


Hamilton On Rod-side Member Amsoil Dealer

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X2 Our race car always had one before the pump

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Marten


Kemptville Ont Carpenter/Renovations

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So this is what I have. Bought fuel line, -6an to go from the tank to the pump. The pump uses-8 fittings but forgot to buy the reducer. The Summit guy told me -6 was large enough for 400hp. The lines that came with the motor were all -8. I have everything from the pump to the carb in -8. Seen others with the filter right at the carb so got the fittings I needed for that. Forget that that line was -8 and ordered a -6 filter. One solution was to buy the right fittings to put the filter between the tank and pump. That would be 2 straight fittings. Get a reducer at the pump and leave the -8 lines from pump to carb. The other solution is to get the correct fittings and parts to change the -8 line from pump to carb to -6. Option one is way more cost effective. It was my lack of experience getting me again. They way this all started was the Summit guy telling me that -6 was 3/8" line. So I went and measured the line I had. Looked like 3/8" clear inside to me so I assumed it was -6.
Does that help?

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wuga


Prince Edward County Ont

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Marten

6an has nothing to do with 3/8. 6 or 8 or whatever an is the inverted flare size. 5/16 or 3/8 etc is the tube size. These can be had in any combination. I have some spare 6an fittings, one which was on my fuel pump and may resolve at least one problem. I wouldn't worry too much about the filter location as long as the carb is protected. PM me your phone number, I know I had it at one time but no more and you can have these fittings, they are of no use to me.

Warren

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Slim


Hydraulic Service Dundas On

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6 AN is 3/8 ... 5 is 5/16  4is 1/4 the dash size always refers to the fitting , hose tube diameter throughout the range of imperial connectors. Just for your information AN fittings are expensive if your paying less then 10 or 15 bucks for a 3/8 fitting its JIC they are identical except for the class of fit on the thread. 40 to 50 % stronger . by law any AN fitting will be marked so and carry a manufactures mark so they can be traced.



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wuga


Prince Edward County Ont

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In various applications I am running both Earl's and Russel fittings. I have 6 an to 5/16 tube, 6 an to 3/8 tube and 8 an to 3/8 tube. The 4, 5, 6, or 8 may refer to the inside diameter of the fitting, but what is more important in a street application is what it adapts to, npt, tube, flare or another an fitting.

Warren

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Slim


Hydraulic Service Dundas On

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The AN refers to the 37degree flare end  ... Army/navy same as the 37 degree jic flare end  Joint industrial council that dash number is always going to refer to the tube end  od as tubing comes in different wall thickness the id changes 

Size comparison[3]
AN size-2-3-4-5-6-8-10-12-16-20-24-28-32
Tube OD (inches)​1⁄8​3⁄16​1⁄4​5⁄16​3⁄8​1⁄2​5⁄8​3⁄41​1 1⁄4​1 1⁄2​1 3⁄42
Nominal hose ID (inches)​1⁄8​3⁄16​1⁄4​5⁄16​3⁄8​1⁄2​5⁄8​3⁄41​1 1⁄4​1 1⁄2​1 3⁄42
Actual hose ID (inches, approximate)​1⁄16​1⁄8​3⁄16​1⁄4​5⁄16​7⁄16​1⁄2​5⁄8​7⁄8​1 1⁄8​1 3⁄8​1 5⁄8​1 3⁄4
SAE thread size​5⁄16-24​3⁄8-24​7⁄16-20​1⁄2-20​9⁄16-18​3⁄4-16​7⁄8-14​1 1⁄16-12​1 5⁄16-12​1 5⁄8-12​1 7⁄8-12​2 1⁄4-12​2 1⁄2-12
Pipe thread size (NPT) ​1⁄8-27​1⁄4-18 ​3⁄8-18​1⁄2-14 ​3⁄4-14    

Note the 1/8 pipe dash size is wrong in this chart it should be -2



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