Gotta question, doesn anyone have any ideas on how to hookup AN fittings to the fuel tank?

I was going to cut the metal fuel line and flare it, then have a fitting that would go from the flare nut on the fuel line to a fitting that would have the AN fitting on the opposite side. Then I seen a pic at supraforums of a guy that had his fuel filter in his hatch and a hole cut in the hatch floor for easy access to the fuel pump. The guy ran the braided steel line right into the fuel tank.

Any input, ideas, have done, seen done, would be appreicated. Thanks.

I did my 2 Walbro upgrade 2 weeks ago and initially planned to use two 6AN lines into one 8AN throught the Y-block inside the tank, then feed supply line throught the top using 8AN 180deg bulkhead union. Wanted also use 180deg 6AN bulkhead union for return line.
I had all these parts on hand and when I removed the tank I realised there is not enough room inside the tank for Y-block, hose ends, fittings etc.. Alo space between tanktop and trunk floor very limited.
Here are few pictures how I did it
http://mk3ukr.photosite.com/mk3ukrSupra/Fuel_system_01.html
http://mk3ukr.photosite.com/mk3ukrSupra/Fuel_system_02.html
http://mk3ukr.photosite.com/mk3ukrSupra/Fuel_system_05.html
http://mk3ukr.photosite.com/mk3ukrSupra/Fuel_system_06.html

HTH
Vladimir, 98T

why run 2 fuel pumps into one line? thats absolutely backwards. the most efficient fuel system would involve two fuel pumps, 2 feed lines and a twin-entry fuel rail with a center return line.

what you can do is use the exisiting banjo fitting on the pump hanger, and where it goes up to the engine, change the soft line that leads to the banjo union that bolts to the motor mount. youll need an inverted flare fitting to -6 line. if you go to a hydraulic hose shop, they can make this for you while you wait. simply remove your stock soft fuel line that sits between the stock hardline and motor-mount banjo-bolt fitting and take it to them. say you need a new -6 line with an inverted flare on one end, and -6 female on the other. make it at least 3' long, since it will bypass your stock banjo bolt union on the motor mount and the FPD. this will bring your stock fuel line to the stock inlet of the rail.

for your second fuel pump, braze a 90" steel elbow with -6 AN thread to the fuel pump hangar. on the inside, braze a hose nipple to which you can clamp the 3/8" soft fuel line to as it connects to the 2nd fuel pump. get 14 feet of -6 fuel line, and a -6 inline fuel filter, its $15. run the 2nd fuel line parallel to the stock fuel line, under the car. this one will go under the manifold and enter the front side of the stock rail.

remove your cold start injector banjo fitting and hose. take this banjo bolt to a local speed shop, tell them you need a metric thread to -6 male adaptor. its probalby going to be 12mm x 1.25 or 1.0. then get a 90* hose end, fasten it to your new banjo bolt adaptor, run 3 feet of line rearward, parallel with the #1 fuel line, and route it one of the side ports of your Aeromotive AFPR. run a -6 line out of the bottom port of your Aeromotive AFPR and slip your new -6 fuel line over your STOCK hard return line.

voila, you now have a 1000hp fuel system.

So with the bulkhead you can just drill a hole, lock the bulkhead in the hole with two nuts tighting on each other?

Nice pics thanks.

So with the bulkhead you can just drill a hole, lock the bulkhead in the hole with two nuts tighting on each other?


Exactly, but if you are going to use ihese unions you have to cut trunk bottom and union will be sticking out to your trunk :aiwebs_00

Vladimir, 89T

[QUOTE=flubyux2]why run 2 fuel pumps into one line? thats absolutely backwards. the most efficient fuel system would involve two fuel pumps, 2 feed lines and a twin-entry fuel rail with a center return line.
QUOTE]

I did not want to use 2 6AN lines because I don't plan to run 2 pumps all the time. 2nd pump starts at 1bar boost pressure.
Single 8AN line connected to another Y-block
http://mk3ukr.photosite.com/mk3ukrSupra/Fuel_system_04.html
and then two 6AN lines feed fuel rail
http://mk3ukr.photosite.com/mk3ukrSupra/Fuel_system_03.html
Return throught the cold start injector hole.

BTW after I changed from stock setup (rear feed) to the new 2 sides feed setup I logged WOT run and found that my AFR went down from my average 12.2 to 11.0-11.2. This is on the same fuel and boost pressure and same fuel map.
I had to retune boosted area of my fuel map, off-boost area was not affected. It's weird, I can only guess some cylinders were lean on stock configuration
Vladimir, 89T

FLUBYUX2: So you CAN get a fitting that would change the hard fuel line flare nut to a "AN" fitting?


Also I was reading somewhere that the stock toyota fuel pump is just as good as the aftermarket walboro?

i do beleive that there is a fitting that exists to change an inverted flare union into a -6, but some hydraulic shops may not be able to get them. the best bet is to have them create something from scratch. what they can make is a -6 female hose end, with a hardline on the other side, and put a inverted flare tube nut on the hardline and place the hardlne in a double flaring maching and fabricate and adaptor.

your best bet for low clearance is to WELD/Braze a 90* -6 elbow to the fuel pump bulkhead, this will create a tighter radius to clear the trunk floor.

i personally plan to run 2 fuel pumps and lines simulatenously so that the fuel is available. its the main fuel system design for MKIV's that lay down 1000rwhp, so if its good for them, its good for me.

Ok, I got. Thanks, for the help.