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 Fuel line at petrol tank
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EdinburghJoe
V4 Fan

United Kingdom
127 Posts

Posted - 08 Jun 2020 :  13:11:44 Show Profile Reply with Quote
Hi all,

I've been having a look under the back seat of my 1972 96, and notice that the fuel pipe might be original - it's got a black fabric weave covering it and it certainly looks like it has been in place for a long time. I replaced some similar piping in the engine bay a couple of years back.

When I put my nose right close to the pipe I could very faintly smell petrol, but I do have to be very close. The condition of the pipe certainly looks OK from the outside.

If the fuel system seems fine then is there any reason to routinely replace this?

Given that I expect the response will be 'Yes' - how to do it? It's in a really awkward place going straight into the box section by the tank. Is it possible to loosen the tank straps and move the tank backwards on the right side far enough to gain access without disturbing the filler and vent hoses on the left?

Or is it possible to reach through the hole in the box section from under the seat (Doubtful!) Or does the tank have to come out?

Also, when I did the front fuel hose sections I used jubilee clips, not the specific fuel hose clips that were on there originally. They seemed to do the trick, are they OK here too?

Thanks all,

Joe

melle
V4 Guru

United Kingdom
3389 Posts

Posted - 08 Jun 2020 :  15:41:19 Show Profile Reply with Quote
You can replace it with the tank in situ; make sure you use fuel hose rated for E10 and avoid no-name crap from eBay. I also use jubilee clips.

www.saabv4.com
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Iain G
V4 Fan

United Kingdom
138 Posts

Posted - 08 Jun 2020 :  18:27:29 Show Profile Reply with Quote
When you remove wood board that covers fuel tank you can get a spanner in the gap between tank and box section.
Jubilee might be too big for the hole depending on size
You can get double ear mikalor clips on eBay same as original
Dont lose the brass fitting and nut - very unusual specific

Iain G
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Derek
V4 Guru

United Kingdom
2041 Posts

Posted - 09 Jun 2020 :  16:04:01 Show Profile Reply with Quote
I replaced the short length of hose on my '76 96. As you say, the tank end isn't easy to get at. It was also messy as there is a syphon action going on there. Annoyingly, and this is from memory, the tank outlet and the forward running pipe were two different sizes. The hose I removed was the original one. I did fit the new piece of hose but one end was tight and the other a bit loose, can't remember which was which. There might have been a metric/imperial size mismatch of the hose in my case. End result was fine and no leaks. Hose change was when I replaced the tank due to accumulated rust. Got a tank from someone here but can't remember who. If you are replacing this hose, get enough to do the ones at the pump end at the same time. Buy the best you can, 12/metre not 5!
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andydeans3
V4 Guru

United Kingdom
1550 Posts

Posted - 09 Jun 2020 :  19:56:40 Show Profile Reply with Quote
Joe.
Most definitely change the rubber petrol pipe, whatever it takes.
If the pipe currently fitted is as old as you suggest, it will not be ethanol resistant.
Next year we're moving to 10% (E10) fuel, though I believe that E5 will still be available, no doubt at a premium price.
You do NOT want E10 in your fuel system, if you can avoid it.
As Melle says, buy it from a reputable seller, not off some dude on E bay.

Andy

1978 LHD SAAB 96
1978 MGB Roadster
2008 LHD "Classic" Renault Twingo
1991 Nissan Figaro

Edited by - andydeans3 on 09 Jun 2020 19:57:47
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EdinburghJoe
V4 Fan

United Kingdom
127 Posts

Posted - 18 Jun 2020 :  15:16:06 Show Profile Reply with Quote
This job has moved to the top of my 'to do' list now that I've done the brakes on my 'normal' car.

A few questions just to clarify:
1) Melle said I can do the job with the tank in situ: does this mean loosening it and moving it back to get some space, as I suggested, or leaving it where it is?
2) Anyone know what bore of fuel line I need?
3) How likely am I to spill petrol all over the place (I always tend to keep the tank fairly full)? Inside the tank, does the fuel line rise above the level of the petrol, so preventing it all just leaking out if I undo the hose? Derek mentioned a syphon action - could I negate this by blowing back into the tank to force the fuel out of the downward section of pipe?

Thanks all,

Joe
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Iain G
V4 Fan

United Kingdom
138 Posts

Posted - 18 Jun 2020 :  16:05:03 Show Profile Reply with Quote
I am sure you can get a spanner in the gap without removing or loosening tank.
Fuel pipe bore is 6mm.
You are bound to spill a little fuel from pipe but not tank.

Iain G
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ianh
V4 Fanatic

United Kingdom
250 Posts

Posted - 18 Jun 2020 :  16:18:16 Show Profile Reply with Quote
Hi Joe, nice talking to you today. All the above cover what we were talking about, Derek mentions the different sizes of connections, the tank outlet was the smaller one, not a tight fit for the hose.
I can't help on the fuel spillage question as my tank was empty at the time.
Have you thought of fitting an electric pump while you are at it?
Regard Ian
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n/a
deleted

4 Posts

Posted - 19 Jun 2020 :  12:23:06 Show Profile Reply with Quote
Make the effort to get as much petrol out of the tank before you start the job. You know it makes sense. Disconnect hose at the fixed pipe end first and quickly stick something in it to stopper it off. Have that end higher than the tank when you loosen the tank end clamp to stop the syphon action and it should be much less messy. Have a cloth or some blue roll handy.
Drain plug? Probably. Beware of sparks. Disconnect battery as the first job.

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melle
V4 Guru

United Kingdom
3389 Posts

Posted - 19 Jun 2020 :  16:47:33 Show Profile Reply with Quote
I've replaced a few fuel hoses; can't remember ever emptying a tank first, but perhaps I checked them and they were already nearly empty. It's only a small hole, so it won't leak out that fast, perhaps plugging the vent (behind the bumper or on top of the tank) helps too. In addition to what Derek (new account?) suggests, cut a new piece of hose to the right length with one end plugged, swap over the hoses at the tank end, remove the old hose from rigid line, remove the plug from the new hose, and quickly connect it to the hard line. Leave two jubilee clips dangling around the hose first, you can do them up when everything is in place. There is a drain plug in the bottom of the tank (usually they're not easy to open), but I would just siphon the fuel out (suck and spit!) if you want to empty the tank first. No need to loosen the tank straps, just leave everything where it is. Don't overthink it!

www.saabv4.com
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EdinburghJoe
V4 Fan

United Kingdom
127 Posts

Posted - 20 Jun 2020 :  20:53:06 Show Profile Reply with Quote
Thanks for all the helpful replies - I was pretty nervous about it, a friend of a friend had really nasty burns after a fire when he was using petrol to srip a floor so I wanted to be careful. I did the job yesterday and it worked out fine. Just in case anybody else reads this, here's what I did:
- I started with a full tank (not a good idea), but siphoned out about 3 or 4 litres using a fuel hose shoved down the filler pipe. The hose didn't seem to go in very far, which was why the siphon stopped working after only a small amount. I guess if you were starting with 3/4 full tank or less then this step wouldn't be necessary.
- Under the back seat, I clamped the hose to be replaced with mole grips, and cut off the original clip joining the hose to the metal pipe under the seat, using a hacksaw.
- I was pretty wary of the siphon action which a couple of people have mentioned, so I cautiously opened the mole grips and allowed fuel to flow into a 2 litre drink bottle lying on its side, holding the end of the hose as low as I could. After about one or so litres the bottle was as full as it could get in that position, so I clamped the pipe and put the lid on the bottle. Then got another bottle and did the same thing, but by this time the siphon action wouldn't start again, so I concluded I'd taken enough out. I let the open end of the hose dangle down and there was no fuel coming out, so I thought it must be safe enough to then undo the connector at the tank.
- The rest of it was pretty easy. The tank connector undid easily, and 6mm hose fitted both ends fine. I used fairly slim fuel hose clamps (from Halfords) rather than jubilee clips - they were small enough to allow me to clamp the hose to the connector off the car, and thread the whole thing through the hole in the bulkhead and screw it into the tank.
- Connect the hose to the metal pipe under the seat, using a similar connector and empty the bottles of petrol back in the tank.
- And I disconnected the battery throughout.
Took the car for an 80 mile drive today (furthest I've been in about 9 months) and it was fine, so I must have done something right!
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melle
V4 Guru

United Kingdom
3389 Posts

Posted - 20 Jun 2020 :  21:51:38 Show Profile Reply with Quote
Great to hear Joe!

www.saabv4.com
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n/a
deleted

4 Posts

Posted - 21 Jun 2020 :  13:15:55 Show Profile Reply with Quote
Melle thanks for noticing that I am once more a newbie!! Don't know what has happened there but after all of the problems I've had since the new version of Edge was inflicted upon me I suspect that is the cause. Don't remember what my number of posts were but above 2.5k at least. If Alec reads this perhaps he can correct/update it. I will cross post this to "News" as he will likely see it there.

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EdinburghJoe
V4 Fan

United Kingdom
127 Posts

Posted - 31 Aug 2021 :  11:04:08 Show Profile Reply with Quote
Just an update on this: the fuel hose I used was from Halfords (yes, I know...) rated SAEJ30 R6. As soon as I used it in the tank connection the car always smelt of fuel when I got in, but there were no visible leaks. I guessed it must be permeation so I recently replaced it with 'Gates Barricade' (or possibly 'Gates Greenshield'?) hose, to SAE30 R14T1 - sold as being low permeation, and that seems to have got rid of the smell.
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SAAB96L
V4 Fan

United Kingdom
122 Posts

Posted - 31 Aug 2021 :  15:07:00 Show Profile Reply with Quote
Gates Barricade fuel pipe is probably the best hose you can fit and is purpose made for ethanol related fuels. Best VFM price is via Moss. What I also like about Gates is that it can be purchased in either Metric or Imperial.

Close second is Cohline fuel hose with Codan running in at third.

The R grade needs to be R14 these days.

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melle
V4 Guru

United Kingdom
3389 Posts

Posted - 01 Sep 2021 :  08:33:45 Show Profile Reply with Quote
How did you establish your top three?

www.saabv4.com
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