keyring
Part of things
Posts: 913
Club RR Member Number: 47
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Jun 26, 2018 20:15:14 GMT
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Soon to be fitting a 16v injection engine to my Suzuki sj, I bought a fuel tank from an injection model, however, I’m struggling to get the pump, sender unit and tank insert. So my plan is to use the carb tank, and I’m just going to fit a return line, I plan just to use a bulkhead fitting into the tank, I need this to be 90 degrees when coming out the tank due to the space between the tank and the angle of the fuel hose. I planned to use the following  And then from this, I’ll fit a 90 degree bspp to barb and it should be a good ‘un! My question is, in terms of the bulk head fitting, what do people recommend using to seal it. I planned to use a fibre washer on each side, but thought I’d see if anyone has experience with a better idea.... |
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I'm interested in this for a different reason - to adapt a plain vanilla (easy to get) tank sender unit to also have the fuel pickup line. I was talking to a supplier the other day about the issue, and his response was "you would use a seal. We have BDS - but you may need a Viton type". I took it that "Viton" is some kind of fuel-safe sealing material, but I didn't get any more detail and haven't had chance to look further.
But, when I was thinking about injection and how to easily get a return fuel line fitted, I wondered about adding the return into one of the rubber sections in the filler pipe, partly because I thought it might be easier, and partly because tanks for my car are like hens teeth and I didn't want to be drilling holes in an otherwise good one.
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scimjim
Club Retro Rides Member
Posts: 1,503
Club RR Member Number: 8
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If you’re not using an in-tank pump, I’d fit a swirl pot to prevent loss of pressure on corners with low fuel levels - you’ll need a LP pump to feed the swirl pot but you can feed the return into it too.
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keyring
Part of things
Posts: 913
Club RR Member Number: 47
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Jun 27, 2018 19:41:18 GMT
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I'm interested in this for a different reason - to adapt a plain vanilla (easy to get) tank sender unit to also have the fuel pickup line. I was talking to a supplier the other day about the issue, and his response was "you would use a seal. We have BDS - but you may need a Viton type". I took it that "Viton" is some kind of fuel-safe sealing material, but I didn't get any more detail and haven't had chance to look further. But, when I was thinking about injection and how to easily get a return fuel line fitted, I wondered about adding the return into one of the rubber sections in the filler pipe, partly because I thought it might be easier, and partly because tanks for my car are like hens teeth and I didn't want to be drilling holes in an otherwise good one. Viton is a rubber usually used for orings, it is chemical resistant  I had considered putting an oring on each side, but I think it’d get nipped, hence thinking more about a fibre washer... Luckily the sj tanks are easy enough to pick up remanufactured ones. If going for injection, could you not put a fitting into the the top plate of the sender unit? ( now thinking I could possibly do this myself) If you’re not using an in-tank pump, I’d fit a swirl pot to prevent loss of pressure on corners with low fuel levels - you’ll need a LP pump to feed the swirl pot but you can feed the return into it too. That could be a good idea, as I use the sj off-road, so it will be at unusual angles at some point! |
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scimjim
Club Retro Rides Member
Posts: 1,503
Club RR Member Number: 8
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Jun 27, 2018 20:41:08 GMT
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Viton is a rubber usually used for orings, it is chemical resistant I had considered putting an oring on each side, but I think it’d get nipped, hence thinking more about a fibre washer... You need Dowty washers - viton seal bonded in place to prevent nipping  |
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Last Edit: Jun 27, 2018 20:42:08 GMT by scimjim
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keyring
Part of things
Posts: 913
Club RR Member Number: 47
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Jun 27, 2018 20:54:44 GMT
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Viton is a rubber usually used for orings, it is chemical resistant I had considered putting an oring on each side, but I think it’d get nipped, hence thinking more about a fibre washer... You need Dowty washers - viton seal bonded in place to prevent nipping They are maybe the way to go, my only concern with them was if the metal ring would crush before it bit/deformed the tank, but with one on each side, it would prevent the tank being deformed, so I’ve just realised this has been a total brain fart as I wrote it  So dowty seals could well be the way to go! |
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scimjim
Club Retro Rides Member
Posts: 1,503
Club RR Member Number: 8
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Jun 27, 2018 21:03:27 GMT
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I’d still recommend a swirl pot - an in-tank injection pump generally has an inbuilt swirl pot to prevent surge.
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keyring
Part of things
Posts: 913
Club RR Member Number: 47
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Jun 27, 2018 21:20:44 GMT
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I’d still recommend a swirl pot - an in-tank injection pump generally has an inbuilt swirl pot to prevent surge. I’m looking into them at the moment, just a 1ltr one I’d fit to the bulk head |
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If going for injection, could you not put a fitting into the the top plate of the sender unit? ( now thinking I could possibly do this myself) My sender unit is on the front face of the tank, about halfway up. I always figured there would be problems routing the fuel back in below the level of the fuel in the tank. I guess the pressure in the injection line would probably negate that. You can tell I didn't look into it in any great detail. |
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keyring
Part of things
Posts: 913
Club RR Member Number: 47
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Jun 28, 2018 19:53:18 GMT
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If going for injection, could you not put a fitting into the the top plate of the sender unit? ( now thinking I could possibly do this myself) My sender unit is on the front face of the tank, about halfway up. I always figured there would be problems routing the fuel back in below the level of the fuel in the tank. I guess the pressure in the injection line would probably negate that. You can tell I didn't look into it in any great detail. Ahh, I assumed yours was going to be on top the same as mine! |
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willg
Part of things
Posts: 163 
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Bit late to the game, but if your using a outside of tank pump, could you tee the return line in just before the pump? This is what I had in mind for a carb -> injection project
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Retro is best!
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I had considered putting an oring on each side, but I think it’d get nipped, hence thinking more about a fibre washer...
