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Where is the Fuel Line Connected to stock Hitachi Carb?


wolfmandu

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Hello fellow Datsun lovers. I just cleaned out the jets in my carb as I believe the main (left jet) was clogged. Of course the bowl emptied out of gasoline. When I got everything back together it just turns over but won't start (1st time ever). Thought I needed to prime the carb. I did that and it started right up for about 3 seconds then died. I think the right next thing to try is to prime the fuel pump which I believe means I have to disconnect the fuel line from the carb, spray the carb with starting fluid and have my son turn the engine over while I hold a rag to the end of the disconnected line until I see gas is coming out. But I don't know which line is the fuel line on the actual carb. It's the stock Hitachi. A picture or description would be great. Also, maybe someone has another idea and I'm doing the wrong thing, Any and all advice is appreciated. I need my baby back on the road. Thank you all.

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The output fitting from the fuel pump should have a rubber hose that connects to a small diameter steel gas line which follows around the front of the valve cover and back to the carb. There is another short rubber hose connecting this steel line to the nipple on the top front of the carb (atop the float chamber). This nipple is part of a banjo fitting held to the top of the carb by a through bolt. Inside the banjo fitting is a fine mesh filter screen. It is worth removing the banjo fitting and making sure this screen is clean. If the Hitachi is original there may be a safety fitting thingy around the through bolt held to the carb top by a screw. This fitting keeps the banjo fitting in place so it can't come loose and leak gas,

 

The safe way to check a fuel pump is get 2 or 3 feet of fuel hose and put it in place of either the rubber line out of the fuel pump or the one going to the carb. Direct this long line into a coffee can or some sort of container so the flammable gas goes into the can not onto the engine. You should get really strong pulses of gas when the engine is cranked if your pump is working. You shouldn't need to use starting fluid if your battery is strong - just crank the engine over. If you aren't getting good output it may be a weak fuel pump or clogged gas lines.

 

Len

 

 

 

 

 

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I would say fuel line enters the carb on the front (rad side)

 

wolfmandu... left and right on a vehicle is, as it would be seen, if seated in the driver's seat. Steering wheel is on the left side of car. You can also say driver's side or spark plug side for clarity. The left jet would be the secondary side the right jet would be closer to the valve cover and is the primary. Avoid having both out at the same time as they can be interchanged. Generally the primary will be marked 'around' 100 and the secondary 'around' 160.

 

When the fuel line is removed from the carb the gas can siphon back some. Usually cranking the engine over brings it back. If not a couple of tablespoons of fuel down the carb will fire it up and this will  do the job. 

 

If the carb was disassembled, make sure the choke is closed or it won't start easily. 

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