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Fuel Hose Clamps #754278
02/09/22 07:32 PM
02/09/22 07:32 PM
Joined: Jun 2012
Posts: 1,952
United Kingdom, Lincolnshire
planenut Offline OP
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planenut  Offline OP
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Joined: Jun 2012
Posts: 1,952
United Kingdom, Lincolnshire

The original engine mounted crimped fuel hose clamps are a known leak problem and many owners have replaced them with screw type hose clamps. If you were lucky a leak around the injectors resulted in new windscreens, if you were unlucky a fire.

Following a report of a fuel leak on a car that has had new hoses and clamps fitted in the last two years I had a check on my car. I replaced the hoses (and clips) a bit over two years ago and was surprised to find all the hose clamps were on the loose side, not leaking but they all required a couple of turns to tighten them fully. Not sure if this is just the hose bedding in or the clamps working loose with vibration.

It may be worth a check on the hose clamps if you have replaced them. I have put some locking varnish on the clamps to show if they have moved now. If you still have the original crimped on clamps....why?

Re: Fuel Hose Clamps [Re: planenut] #754280
02/09/22 07:53 PM
02/09/22 07:53 PM
Joined: Feb 2019
Posts: 3,694
Port Orchard, WA.
LightSpeed Offline
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LightSpeed  Offline
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Joined: Feb 2019
Posts: 3,694
Port Orchard, WA.
That is a very good reason to have someone make up injector tower clamps with AN fittings.


The light at the end of the tunnel is actually a train. 2019 M3W

Re: Fuel Hose Clamps [Re: planenut] #754287
02/09/22 08:50 PM
02/09/22 08:50 PM
Joined: Feb 2016
Posts: 5,511
East Harling, Norfolk UK
RichardV6 Offline
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RichardV6  Offline
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Joined: Feb 2016
Posts: 5,511
East Harling, Norfolk UK
The hose clamp screws won't have moved Ian, even with vibration, but the hose wall will have distorted/settled with time allowing room for further nipping up.


Richard

2018 Roadster - Red/Magnolia - "Morton"
1966 Land Rover series 2a SWB
1945 Moto Guzzi Airone
Re: Fuel Hose Clamps [Re: RichardV6] #754337
03/09/22 12:34 PM
03/09/22 12:34 PM
Joined: Jun 2012
Posts: 1,952
United Kingdom, Lincolnshire
planenut Offline OP
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planenut  Offline OP
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Joined: Jun 2012
Posts: 1,952
United Kingdom, Lincolnshire

I think you are correct Richard but a bit of locking varnish never hurts 😊.

Re: Fuel Hose Clamps [Re: planenut] #754340
03/09/22 01:02 PM
03/09/22 01:02 PM
Joined: Feb 2018
Posts: 636
SW Iowa, U.S.A.
Bitsobrits Offline
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Bitsobrits  Offline
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Joined: Feb 2018
Posts: 636
SW Iowa, U.S.A.
Fuel hose tends to shrink a bit with exposure to modern fuels, especially non FI rated hose which can shrink rather alarmingly. High quality OEM FI hose that the major manufacturers use will exhibit almost no shrinkage. Note that most manufacturers today do not use screw clamps on their high pressure lines, but rather the crimp type which are much maligned and misunderstood on this forum due to using incorrect type, size and installed with incorrect tools.

I would add that to use crimp type hose clamps on high pressure FI systems there are requirements:

Use only stainless steel clamps to preclude corrosion related failures
Use only clamps that fully wrap around the hose (oetiker stepless type) sometimes called wrap and a half as they have an overlapping wrap
Use the smallest diameter that will slide over the installed hose to insure proper tensioning
Use the correct parallel blade 'pincer' tool to install

Using the above guidelines (which I have been doing for the last 30 years or so) you will not have a clamp related failure or leak.

If you are using the cheap parts store fuel hose, you will want to replace that every few years or better yet get OEM spec FI hose from a dealer (think BMW, Porsche, etc)

Unlike oetiker type clamps which maintain clamping pressure over time through constant spring force, screw type clamps are not dynamic, i.e. once set, you will have to nip them up over time to compensate for hose shrinkage. Screw type clamps, unless the double wrapped type, will also deform and perhaps damage the outer laters of the hose.

As an interesting side note and testimonial, stepless stainless oetiker clamps (along with smooth ring type copper clamps) have been used in millions of Pex type plumbing installations (in the U.S. at least) for over 20 years without issue.

Last edited by Bitsobrits; 03/09/22 01:32 PM.

Steve
Late 2012 M3W




Re: Fuel Hose Clamps [Re: planenut] #754563
05/09/22 12:31 PM
05/09/22 12:31 PM
Joined: Nov 2013
Posts: 676
exagone
G
GLLOQ Offline
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GLLOQ  Offline
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G

Joined: Nov 2013
Posts: 676
exagone
bitsobrits
I agree with you, there is also a Norma quality collar that does not damage the hoses and is not easy to obtain.
[Linked Image]
[Linked Image]
The Oetiker collars are very good collars but do not allow subsequent tightening if they have been tightened to the maximum during assembly and the good clamp is appreciated.
I used Gates barricade to redo the two hoses with Oetiker collar at the bottom and Norma collar at the top and protect my hoses with fiberglass sheath, I hope it will last as long as the original hoses (8 years ).
[Linked Image]
[Linked Image]

Re: Fuel Hose Clamps [Re: planenut] #754565
05/09/22 12:43 PM
05/09/22 12:43 PM
Joined: Nov 2018
Posts: 4,743
Northants, UK
TBM Offline
Part of the Furniture
TBM  Offline
Part of the Furniture

Joined: Nov 2018
Posts: 4,743
Northants, UK
Those top ones look like Mikalor ones?


1972 4/4 4 seater - 3G Morganeer
Too many ratty motorbikes
Re: Fuel Hose Clamps [Re: GLLOQ] #754579
05/09/22 02:45 PM
05/09/22 02:45 PM
Joined: Mar 2014
Posts: 1,515
Leicestershire, UK
Bunny Offline
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Bunny  Offline
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Joined: Mar 2014
Posts: 1,515
Leicestershire, UK
Originally Posted by GLLOQ
[Linked Image]
Those look like the Norma ones that MMC use and they are infinitely superior to the usual ones available online which seem to be made from very thin, bendy metal. I've just been able to open a business account with Wurth and now have some on order. Not cheap, but worth every penny I reckon.

Last edited by Bunny; 05/09/22 02:46 PM.

Andy
Re: Fuel Hose Clamps [Re: GLLOQ] #754586
05/09/22 03:27 PM
05/09/22 03:27 PM
Joined: Feb 2019
Posts: 3,694
Port Orchard, WA.
LightSpeed Offline
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LightSpeed  Offline
Talk Morgan Addict

Joined: Feb 2019
Posts: 3,694
Port Orchard, WA.
Originally Posted by GLLOQ
bitsobrits
I agree with you, there is also a Norma quality collar that does not damage the hoses and is not easy to obtain.
[Linked Image]
[Linked Image]
The Oetiker collars are very good collars but do not allow subsequent tightening if they have been tightened to the maximum during assembly and the good clamp is appreciated.
I used Gates barricade to redo the two hoses with Oetiker collar at the bottom and Norma collar at the top and protect my hoses with fiberglass sheath, I hope it will last as long as the original hoses (8 years ).
[Linked Image]
[Linked Image]

I see you threaded pipe fittings into the injector clamps/towers. Good idea.


The light at the end of the tunnel is actually a train. 2019 M3W


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