JSB Posted March 4, 2013 Report Share Posted March 4, 2013 HI all, After selling my 74 620 (my first vehicle) in 1988, I have spent the last 25 years wanting another. Just bought a 73 over the weekend. The PO replaced the gas tank but didn't hook up the lines. Hoping for a little help getting the lines right. Included some pics because I know you guys will ask for them. I have all the missing stuff including the center portion of the core support that was cut out. The arrow is pointing at a line coming out of the right side of the tank. I'm guessing this is the main fuel line? This pic is via the right rear wheelwell. a couple hoses not hooked up. wondering if one of these hoses should be removed and the other should be hooked up to the connection on top of the tank.... ...or is this unused connection something I should be utilizing? Any help would be awesome. Quote Link to comment
datzenmike Posted March 5, 2013 Report Share Posted March 5, 2013 He didn't hook it up because that tank (I think) is for a later or different model than the '73. The two outlet pipes at the back were used later. The right side pipe is the fuel outlet to the motor. The very rear most pipe at the top back is the fuel return line used after '75. Probably you won't need it and it can just be left sealed. The one just forward of it is the fuel evaporation hose. In the picture below (with two hoses with open ends) take the short hose off and connect the other longer hose with the gear clamp on the pipe on the tank. Quote Link to comment
JSB Posted March 5, 2013 Author Report Share Posted March 5, 2013 I believe he said it came from a 77 so that makes sense. Thanks! BTW, found and scanned some old pics of my first 620! I took these around 1986. Quote Link to comment
JSB Posted March 5, 2013 Author Report Share Posted March 5, 2013 Welcome to Ratsun :) Thanks! Quote Link to comment
JSB Posted March 6, 2013 Author Report Share Posted March 6, 2013 ok, long story, I'll try to be brief. Day 1 Got the lines hooked up, discovered that we still weren't getting any fuel. Tried to suction fuel right out of a can in the engine compartment. still no fuel. Ordered a new fuel pump. Day 2 Got in the fuel pump, it was the wrong one. Ordered another one. Spent some time fixing some wires and tightening bolts that were loose. Day 3 Replaced the fuel pump and fuel filter and tried again out of the can, bingo got fuel and a running truck (rough but running). Hooked the fuel line back up to the tank and no fuel. Unhooked the line directly at the tank, dry as a bone. Stuck the gas can under the tank and the truck runs. So I'm back to the tank which the PO said he just replaced. Drained (the gas looked clean btw) and removed the tank, used an air compressor (small low pressure) to try to free any debris that might be clogging the fuel pick up, but it appears to be blocked somewhere in there. Any ideas or should I be looking for a repair shop? Quote Link to comment
bigman420 Posted March 7, 2013 Report Share Posted March 7, 2013 I had same problem on my 320 the fuel pick up line was rusted shut.....what you need to do is get coat hanger, straighten it out, get some pliers and ram that fucker down thru that line.....then i took some clean gravel and put it in tank shook it around really good to get rust out of tank....clean really good hopefully you good to go Quote Link to comment
bigman420 Posted March 7, 2013 Report Share Posted March 7, 2013 Curve the tip of hanger and make it smooth so it will make that curve without digging in Quote Link to comment
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