achewood Posted March 7 Report Share Posted March 7 (See attached photo) This photo, which was taken over the right rear tire and aimed at the gas tank, shows the torn fuel line. Anyone have advice for a DIY fix in a tight little space like this? I'd rather learn to do it myself than go the garage route, and my hobby is buying weird tools. Many thanks in advance. 2DFA69DC-C463-4F1A-AA5F-E33EBC09BB74.heic Quote Link to comment
Shortbed Posted March 7 Report Share Posted March 7 Can't see pic, but assuming you have the wire and bolt hose clamp. I have the same issue. Can't fill over 8-ish gallons to be safe or else I spill. I picked up 1/4" fuel line (about 2', cut to fit) and quick connection hose clamps (use of pliers to get on/off, 5/16"-5/8" assorted). The hose that tore on mine is top of fuel tank to reserve? tank. I have NOT tried the fix yet but hopefully some long needle nose pliers, phillips, razor blade, taking the tire off will fix it. I can try to post pics and update this upcoming weekend. Best of luck! 1 Quote Link to comment
achewood Posted March 7 Author Report Share Posted March 7 https://tinyurl.com/5n6n2dhj the forum’s tools won’t allow “insert from url” or image uploads on either chrome or safari on iOS or macOS but hopefully this can be seen. Thank you! Quote Link to comment
Onstad Posted March 7 Report Share Posted March 7 3 hours ago, Shortbed said: Can't see pic, but assuming you have the wire and bolt hose clamp. I have the same issue. Can't fill over 8-ish gallons to be safe or else I spill. I picked up 1/4" fuel line (about 2', cut to fit) and quick connection hose clamps (use of pliers to get on/off, 5/16"-5/8" assorted). The hose that tore on mine is top of fuel tank to reserve? tank. I have NOT tried the fix yet but hopefully some long needle nose pliers, phillips, razor blade, taking the tire off will fix it. I can try to post pics and update this upcoming weekend. Best of luck! Thanks for sharing your approach. Sounds like the same issue I have. I’ll post my experience and look for yours as well — I’ll have it jacked up in the driveway and tire off this weekend! Will research quick connection hose clamps as there isn’t space in there to work with the pressure union joint you see in the fuel line repair videos. Quote Link to comment
Stoffregen Motorsports Posted March 7 Report Share Posted March 7 How to replace the hose? Remove the old one and install a new one. It may be hard to get to, but with some persistence and a couple different tools, you should be able to do it in the truck. FIrst thing I'd do is scrub all the junk off so it doesn't get in the tank after you get the old hose off. Use a big nasty wire brush and maybe a flat screwdriver to loosen up all that crud. Spray the hose clamp with WD40 before you try to loosen it. Once you get the clamp loose, remove it and slit the hose with a utility knife. Be careful not to cut too hard though, as it could scar the nipple on the tank. That's removal. Installation is simply a matter of getting good quality hose. With today's fuels, some hoses will break down in months. Ever search for SAE specs? You can find the exact hose specs by doing a google search for SAE fuel hose standards. Why is this important? Because auto parts stores don't know everything and they'll sell you what they have on hand, even if it's not great quality. 3 1 Quote Link to comment
Onstad Posted March 7 Report Share Posted March 7 2 hours ago, Stoffregen Motorsports said: How to replace the hose? Remove the old one and install a new one. It may be hard to get to, but with some persistence and a couple different tools, you should be able to do it in the truck. FIrst thing I'd do is scrub all the junk off so it doesn't get in the tank after you get the old hose off. Use a big nasty wire brush and maybe a flat screwdriver to loosen up all that crud. Spray the hose clamp with WD40 before you try to loosen it. Once you get the clamp loose, remove it and slit the hose with a utility knife. Be careful not to cut too hard though, as it could scar the nipple on the tank. That's removal. Installation is simply a matter of getting good quality hose. With today's fuels, some hoses will break down in months. Ever search for SAE specs? You can find the exact hose specs by doing a google search for SAE fuel hose standards. Why is this important? Because auto parts stores don't know everything and they'll sell you what they have on hand, even if it's not great quality. thank you Stoffregen! I haven’t been on message boards since the 00’s but this kind of neighborly helping hand is a real breath of fresh air in internet discourse. Your information is useful and much appreciated. 2 Quote Link to comment
EDM620 Posted March 9 Report Share Posted March 9 E85 is a bit nasty, prevalent where you're located? Tends to varnish/gum up faster 1 Quote Link to comment
EDM620 Posted March 9 Report Share Posted March 9 I do believe if recall correctly, that hose should be to the evap cannister. A definate direct line into your tank so replace it for sure & reconnect it 1 Quote Link to comment
achewood Posted March 9 Author Report Share Posted March 9 1 hour ago, EDM620 said: E85 is a bit nasty, prevalent where you're located? Tends to varnish/gum up faster Never bought that stuff in my life, but good to know! I'm in Portland and this thing tends to get 87-92 depending on if I'm babying it for some reason. Quote Link to comment
achewood Posted March 9 Author Report Share Posted March 9 1 hour ago, EDM620 said: I do believe if recall correctly, that hose should be to the evap cannister. A definate direct line into your tank so replace it for sure & reconnect it Evap cannister -- didn't know about that. What little I do know about the 620 tank is from this one schematic you can find online: https://tinyurl.com/spasdhar Is that on this diagram? So the hose I'm replacing is at the rear portion of the tank, on top. I guess where Line 30 on that diagram attaches to the receiver elbow that's closest to it. Thanks again EDM! Quote Link to comment
Stoffregen Motorsports Posted March 9 Report Share Posted March 9 I don't see an evap can, but I do see a vapor expansion tank. These are actually kind of important, if you don't like fuel splashing in your face when you remove the fuel cap. 1 Quote Link to comment
Onstad Posted March 9 Report Share Posted March 9 2 hours ago, Stoffregen Motorsports said: I don't see an evap can, but I do see a vapor expansion tank. These are actually kind of important, if you don't like fuel splashing in your face when you remove the fuel cap. Time to learn a little basic hydrostatics / automotive engineering! This Datsun keeps on giving. Thanks again Stoffregen! 1 Quote Link to comment
EDM620 Posted March 10 Report Share Posted March 10 23 hours ago, Stoffregen Motorsports said: evap can, but I do see a vapor expansion tank. These are essentially the same thing, different naming. The fuel vapours from the tank are drawn up into the evap cannister (essentially a big plastic cylinder that is stuffed with carbon foam and open at the bottom) where those vapours can be drawn into the manifold/carb through engine vacuum. Yes a benefit is also not having your gas tank pressurize and spewing fuel into your face. Typically found in the engine bay, the round or sometimes sqaured cannister will have 3 hoses connected to it. On your 620 it should be located effectively behind the left headlights Like having a functioning EGR (exhaust gas recycler) valve, it is a benign system that has zero affect on power - as in you won't gain any be removing it - but your vehicle will run better and cleaner internally. Sure, they ain't pretty so often get removed because of appearance, or lack of understanding. If yours is missing, every car in the wrecking yard will have a donor, choose one that you can fit. 1 Quote Link to comment
EDM620 Posted March 10 Report Share Posted March 10 Just now, EDM620 said: exhaust gas recycler Exhaust Gas Recirculation (no coffee in brain yet) 🫠 1 Quote Link to comment
achewood Posted March 11 Author Report Share Posted March 11 Thank you for the great explanation, EDM. (If it's confusing anyone, I am both "Onstad" and "achewood," depending on whether I am posting from phone or computer.) Quote Link to comment
Stoffregen Motorsports Posted March 11 Report Share Posted March 11 EVAP cans get clogged with age. So I would never buy a used one unless I could verify that it works. Cheap aftermarket ones are readily available. It is possible to cut an EVAP can apart, replace the charcoal and filter and then plastic weld the can back together, but wasted effort in my opinion. Also, vapor expansion tanks are not normally vented to atmosphere, while EVAP cans are. 1 Quote Link to comment
Shortbed Posted March 13 Report Share Posted March 13 Got hit with the flu my man. Ill try again this weekend. @Onstad 2 Quote Link to comment
Shortbed Posted March 26 Report Share Posted March 26 @Onstad hopefully you can see the pics. Self explanatory I think. Phillips #2, lineman pliers, 10mm wrench. I cut the hose a little short, may be revisiting later lol hopefully this helps. Ill see if I spill gas at next fill up, not entirely too sure about the quick hose clamps. 1 Quote Link to comment
Stoffregen Motorsports Posted March 26 Report Share Posted March 26 I use the spring clamps whenever I can. As long as you use the correct size for the hose, they work fine. Quote Link to comment
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