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Fuel delivery issue driving me mad!

 
 
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landy_ade
Articulating


Joined: 08 Jun 2004
Odometer: 839
Location: Kent



PostPosted: Sun Nov 26, 2017 3:54 pm    Post subject: Fuel delivery issue driving me mad! Reply with quote

1973 SIII 2.25p which has sat on the drive for a few years doing nothing

There’s petrol in the tank and a new Bearnach pump fitted. I’ve suction tested the pump to make sure it works and all lines are clear right up to the carb (Weber). When I disconnect the fuel inlet pipe to the pump fuel freely flows out in to the ground.
So, after hand pumping the fuel pump several hundred times... nothing, apart from the sediment bowl is now full but the pump outlet is completely dry.
Have got the LR running by feeding petrol straight into the carb hoping that while the engine was running the pump would start doing its job and take over...... but no.
So it’s like the fuel can’t get past the pump. Can’t think what could be wrong.
Any ideas guys? I’m baffled!
I’m moving house in a few weeks and need to get it going so that I can drive it to new place rather than tow it.
Cheers

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1973 88 SIII
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mike328
Articulating


Joined: 10 Dec 2014
Odometer: 793
Location: Suffolk!



PostPosted: Sun Nov 26, 2017 8:04 pm    Post subject: Reply with quote

Is it plumbed in & wired the right way round?

Only asking as i have done this myself.... Embarassed

Also check fuel filter flow direction and non return valve if fitted!

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Snap On: Turning drawers into status symbols since 1920.
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landy_ade
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Joined: 08 Jun 2004
Odometer: 839
Location: Kent



PostPosted: Sun Nov 26, 2017 8:21 pm    Post subject: Reply with quote

Hi there,
How do you mean wired? I replaced a pump a few weeks ago and fitted it like for like replacing the original with a new Bearnach. It only goes on one way with the sediment bowl at the back.
Not bothering with the inline filter until I get it going so fuel line straight into the carb
It’s still driving me crazy! I thought about replacing the sender, but then saw that the sediment bowl was full of fuel so can’t be that

Maybe I’m forgetting something really obvious (like we all do with LRs)

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1973 88 SIII
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mike328
Articulating


Joined: 10 Dec 2014
Odometer: 793
Location: Suffolk!



PostPosted: Sun Nov 26, 2017 8:29 pm    Post subject: Reply with quote

Sorry i was on auto pilot thinking of electric lift pumps... your right shouldn't be possible to fit yours backwards.

Possible that new pump is faulty??

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landy_ade
Articulating


Joined: 08 Jun 2004
Odometer: 839
Location: Kent



PostPosted: Sun Nov 26, 2017 8:59 pm    Post subject: Reply with quote

Hey Mike,
I don’t think so as this problem is what made me replace the pump as I thought “Hmm, 44 year old pump, it could be that I suppose?”
I just don’t get it, the pump gets suction at the inlet when you block the outlet and I made sure that I got the arm on top of the cam when fitting and the bowl is full of fuel! It’s such a simple piece of mechanics I don’t see what could be wrong.
The pump is new, the carb is new, the lines are clear and there’s fuel in the tank!

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1973 88 SIII
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mike328
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Joined: 10 Dec 2014
Odometer: 793
Location: Suffolk!



PostPosted: Sun Nov 26, 2017 9:14 pm    Post subject: Reply with quote

and it runs fine with a temporary tank gravity feeding straight into carb?

How about testing with same temporary tank feeding in to pump to see if it may be an issue with feed from tank / tank breather. Long shot i know...

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landy_ade
Articulating


Joined: 08 Jun 2004
Odometer: 839
Location: Kent



PostPosted: Sun Nov 26, 2017 9:17 pm    Post subject: Reply with quote

Sounds like a plan, will have to wait for next weekend now though.
What’s weird is that the fuel is definitely getting as far as the pump though to fill the bowl up

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1973 88 SIII
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mike328
Articulating


Joined: 10 Dec 2014
Odometer: 793
Location: Suffolk!



PostPosted: Sun Nov 26, 2017 9:29 pm    Post subject: Reply with quote

Yeah and with problems with the feed you wouldn't expect to have fuel run out of line to pump when disconnected either...cant hurt to test everything though. Keep us posted.
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landy_ade
Articulating


Joined: 08 Jun 2004
Odometer: 839
Location: Kent



PostPosted: Sun Nov 26, 2017 9:36 pm    Post subject: Reply with quote

If I don’t fix it before I move I might just sell it as a non-runner
Don’t have much spare time to sort it out

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jojo
Mud Obsessed


Joined: 11 Aug 2007
Odometer: 5422




PostPosted: Mon Nov 27, 2017 10:11 am    Post subject: Reply with quote

When you feed fuel direct to the carb are you using fresh fuel or stale fuel from the tank? Old petrol deteriorates up to the point where it is useless.

J
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landy_ade
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Joined: 08 Jun 2004
Odometer: 839
Location: Kent



PostPosted: Mon Nov 27, 2017 10:42 am    Post subject: Reply with quote

Hi J, There was some very old petrol in the tank but was showing as empty. Have put about £10quids worth of fresh petrol in the tank and it’s running out of the feed from the tank nice and clear no jelly. We’re also using fresh for the carb feed and the juice in the bowl looks ok to me
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1973 88 SIII
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landy_ade
Articulating


Joined: 08 Jun 2004
Odometer: 839
Location: Kent



PostPosted: Fri Dec 01, 2017 10:48 am    Post subject: Reply with quote

After doing a bit of reading I reckon it might be a blocked fuel tank filter... is this something I can get to without taking the tank out????
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1973 88 SIII
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landy_ade
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Joined: 08 Jun 2004
Odometer: 839
Location: Kent



PostPosted: Fri Dec 01, 2017 7:36 pm    Post subject: Reply with quote

Don’t have any more time to spend on this unfortunately... so, the Landy is now on ebay
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mike328
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Joined: 10 Dec 2014
Odometer: 793
Location: Suffolk!



PostPosted: Fri Dec 01, 2017 10:43 pm    Post subject: Reply with quote

Sad Sorry to hear it.
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Scrunt44
Just got MTs


Joined: 11 Apr 2016
Odometer: 137
Location: Scotland.



PostPosted: Mon Dec 04, 2017 7:05 am    Post subject: Reply with quote

Was it not worth having a mechanic fixing it and having a running vehicle for sale rather than a Non Runner which will likely get less money for you?
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