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Nov 17, 2021 19:35:53 GMT
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I am about to fit a pair of Jenvey Heritage throttle bodies to my MGB which is getting a Rover M series conversion. Jenvey helpfully have a suggested layout for this type of setup on their website, starting at the back I already have an MGB tank which has been converted for a return line, a swirl pot and an efi pump, however I'm not sure where to start with the fuel lines.
The throttle bodies have a built in rail so Jenvey sell a banjo fitting which mounts to the side of the itbs which allows connection of an 8mm id pipe, what sort of lines should I be using to get the fuel from the back up to the banjo fittings, I'm thinking hard lines in copper up to the engine bay then a flexi up to the bodies, on to the regulator then back to a hard line return.
I'm not sure whether I am over complicating things here and I should just forget hardline and go with flexi throughout, if so what sort of lines and therefor unions should I be looking at, Teflon seems to be the choice here although I have no experience cutting and fitting unions to this, if I do go with the copper hardlines how do I make the transition from the hardline to flexi?
Any advice would be much appreciated!
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72 MGB GT 88 Daimler Double Six 89 Rover Mini 91 Nissan Figaro 95 Lotus Esprit S4S 18 Discovery
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Nov 17, 2021 20:03:08 GMT
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When I injected my Vitesse, very much on a budget, back in 2004 , I used 8mm copper/kunifer hardline for the majority of the run. It was made in two sections (it’s a complicated shape) with an inline filter at the join. All joints are made with rubber injection hose and proper fuel hose clips. All copper line ends have a single flare to make sure the hose stays on. This isn’t the posh way to do it, no shiny fittings and braided hose, but it’s cheap and it’s been working fine for 18 years /50k miles. Just make sure you use decent hose - I’m finding Cohline 2240 decent.
Nick
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1967 Triumph Vitesse convertible (old friend) 1996 Audi A6 2.5 TDI Avant (still durability testing) 1972 GT6 Mk3 (Restored after loong rest & getting the hang of being a car again)
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Nov 17, 2021 20:24:20 GMT
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This sounds like a plan, I'm trying to make the engine look as though it belongs in the car, hence the heritage bodies, modern braided or stainless fuel lines might look out of place which was why the copper hardline appealed, I assume a simple tube bender can be used for tighter radius corners, and a flaring tool for the ends?
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72 MGB GT 88 Daimler Double Six 89 Rover Mini 91 Nissan Figaro 95 Lotus Esprit S4S 18 Discovery
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Nov 17, 2021 21:50:41 GMT
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As described above, that is pretty much what my Range Rover efi had from the factory (steel pipes which are quite rusty so I will eventually replace the steel with kunifer)
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welshpug
Posted a lot
Posts: 4,360
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Nov 17, 2021 22:58:57 GMT
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you'll need a pressure regulator, get one of the fixed type, jenvey do a holder for the weber/bosch type, 3 bar would be sufficient for most unless you have aready chosen some injectors and are a little marginal you can easily bump it to 3.5 or even 4 bar without stressing the fuel pump too much.
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welshpug
Posted a lot
Posts: 4,360
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Nov 17, 2021 23:00:13 GMT
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oh definitely go hard line for as much as possible, lots cheaper and ultimately safer.
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Nov 18, 2021 11:44:45 GMT
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Might not be suitable for your application, but I found that 8mm fuel pipe from a plumbers merchant was considerably cheaper than my local motorfactors, and the copper pipe comes ready coated in a plastic/resin covering, ideal for under cars 👍
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Nov 18, 2021 12:20:37 GMT
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8mm LPG pipe used in vehicle installations is rubber coated and works well as well. If you have a brake pipe flaring tool with a 8mm (or even 5/16) head it is great to put a flare on the end to retain the hose. (don't go all the way as you just need to form a bulge)
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Nov 18, 2021 12:42:16 GMT
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6mm bore black nylon tubing, bought from your local hydraulics supplier for about £1 a metre.
Which is what car manufacturers have been using for fuel lines for over fifty years.
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Nov 25, 2021 21:55:17 GMT
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6mm bore black nylon tubing, bought from your local hydraulics supplier for about £1 a metre. Which is what car manufacturers have been using for fuel lines for over fifty years. It's great stuff and usually safe for the ethanol in modern fuels. Rubber brakes up a bit. It does have a habit of going brittle if it gets warm though
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