bluebird4200 Posted July 19, 2014 Report Share Posted July 19, 2014 I am looking for any information from anyone who has done a ka24de swap in to their Datsun 620. I need to run the main line to the fuel rail, but there is a return line back to the tank. Anyone have any info or pictures on their same build? Any info would be of help. Quote Link to comment
]2eDeYe Posted July 19, 2014 Report Share Posted July 19, 2014 There are pictures and info in my build thread, it's in my sig Some of the fuel pics are on this page http://community.ratsun.net/topic/22191-1977-620-kingcab-deluxe/page-21 Quote Link to comment
bluebird4200 Posted July 25, 2014 Author Report Share Posted July 25, 2014 I saw the pictures with the fuel pump and filters. So what did you do about the return line? Quote Link to comment
]2eDeYe Posted July 25, 2014 Report Share Posted July 25, 2014 I used the stock return line on the truck connected to the stock system on the motor. Both metal tubes are right there at the frame rail (below the filter in the pic). Be sure you hook them up correctly or it will not run. Quote Link to comment
bluebird4200 Posted July 26, 2014 Author Report Share Posted July 26, 2014 I don't have that second line... On the bottom of the tank at the passenger rear wheel side there is an outlet which is where I believe you hooked your fuel pump at. Then at the top of the tank there looks like there is an inlet. There is a hose connected that goes up to some sort of box that is located up at the top of the rear passenger wheel well. Looks like another hose coming out that heads up toward the front of the truck. What is the box up in the wheel well? Quote Link to comment
bluebird4200 Posted July 26, 2014 Author Report Share Posted July 26, 2014 I followed the hard line that the hoses are connected to, and it comes up on the other side of the engine bay. Seems to be connected to some old vacuum lines. Quote Link to comment
bluebird4200 Posted July 28, 2014 Author Report Share Posted July 28, 2014 There is no return line on this type of fuel tank. Both inlets on the top of the tank are both vents. I was able to see in to the tank by taking out the fuel sending unit. Quote Link to comment
]2eDeYe Posted July 28, 2014 Report Share Posted July 28, 2014 The line on the other frame rail is for your charcoal canister. The box inside the well is the vent for the fuel inlet. Looks like someone rigged something up as that longer metal line looks not right to me. This tank is a 77 and has 3 lines at the top, what year is your truck? You can see here what I mean about the steel lines, they are all 2" nipples. That long metal line in your pic of the fender well box is the one that looks funny to me. I will try to get a picture of the routing and the 'box' on my truck tonight. Quote Link to comment
]2eDeYe Posted July 28, 2014 Report Share Posted July 28, 2014 http://community.ratsun.net/topic/10656-fuel-tank-lines/ From this thread and from Waynos comment, you should be able to T into the vent line to the vent box and run a return line to the T. Early tank Later tank Quote Link to comment
orangie Posted July 29, 2014 Report Share Posted July 29, 2014 If all else fails, you can do what I saw some carbureted mustang to EFI converions did. They cut a section of the filler neck out and added a T where the return line was added and reconnected with some big hose (I would assume fuel compatible). Keep in mind fuel injection systems don't like air bubbles where with carburetors you would never notice the difference sucking in some air when the fuel is low and the tank is sloshing. Generally, you shouldn't get less than a quarter tank if you run a carbureted tank with a fuel injected engine. Another solution is to build a surge tank. It is an intermediate tank in between the stock fuel tank and engine. It takes a low pressure fuel pump to feed the tank and a high pressure pump to pull from the surge tank and feed the engine. Here's an article on the subject: http://www.superstreetonline.com/project_car/ssts_1119_building_a_fuel_surge_tank/ 1 Quote Link to comment
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