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Re: Won't idle..... [Re: Graham, G4FUJ] #554079
16/01/19 10:15 AM
16/01/19 10:15 AM
Joined: Nov 2018
Posts: 529
Northants, UK
TBM Offline OP
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TBM  Offline OP
Talk Morgan Regular

Joined: Nov 2018
Posts: 529
Northants, UK
Originally Posted By Graham, G4FUJ
Just another thought - you possibly have a recirc line (excess fuel returned to fuel tank). May be worth a check.


No - thankfully just a single line.

The fact that she's playing up hot and cold, start of a journey and end of a journey, full tank and 3/4 tank and then fixing herself, points me towards a 'mechanical' issue rather than an electrical issue.

That said, when I have the problem, she the fact that she stills runs perfectly above idle, and accelerates well, and will idle with a little choke makes me think that the fuel pump, fuel line and carb is OK.

I'm going back to my original thought (prior to the cap breather) that due to lack of use, the tank is full of crap and teeny bits are making through the filter and fuel pump gauze and gumming up the idle jet. I might get a spare to carry round so I can try a quick roadside swap next time it happens.

Hopefully, with time and a few filters, everything will get flushed through!


1972 4/4 4 seater
Too many ratty motorbikes
Re: Won't idle..... [Re: TBM] #554082
16/01/19 10:33 AM
16/01/19 10:33 AM
Joined: Aug 2008
Posts: 2,056
Powick
tmg513 Offline
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tmg513  Offline
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Joined: Aug 2008
Posts: 2,056
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Originally Posted By TBM
Originally Posted By Graham, G4FUJ
Just another thought - you possibly have a recirc line (excess fuel returned to fuel tank). May be worth a check.


No - thankfully just a single line.

The fact that she's playing up hot and cold, start of a journey and end of a journey, full tank and 3/4 tank and then fixing herself, points me towards a 'mechanical' issue rather than an electrical issue.

That said, when I have the problem, she the fact that she stills runs perfectly above idle, and accelerates well, and will idle with a little choke makes me think that the fuel pump, fuel line and carb is OK.

I'm going back to my original thought (prior to the cap breather) that due to lack of use, the tank is full of crap and teeny bits are making through the filter and fuel pump gauze and gumming up the idle jet. I might get a spare to carry round so I can try a quick roadside swap next time it happens.

Hopefully, with time and a few filters, everything will get flushed through!

Mine's got a drain plug on the bottom of the tank. Might be worth draining it when you get low to see what comes out.


1972 4/4 2 Seater
Re: Won't idle..... [Re: tmg513] #554089
16/01/19 11:01 AM
16/01/19 11:01 AM
Joined: Nov 2018
Posts: 529
Northants, UK
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TBM  Offline OP
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Posts: 529
Northants, UK
Originally Posted By tmg513
Mine's got a drain plug on the bottom of the tank. Might be worth draining it when you get low to see what comes out.


Good plan, thank you. Worth sacrificing a few litres. I can give her a good 'sloshing' before hand too.


1972 4/4 4 seater
Too many ratty motorbikes
Re: Won't idle..... [Re: TBM] #554128
16/01/19 02:38 PM
16/01/19 02:38 PM
Joined: May 2010
Posts: 6,313
Llanelli
sospan Offline
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sospan  Offline
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Joined: May 2010
Posts: 6,313
Llanelli
I had a fuel problem on my 1993 4/4. It was the pump. While renewing it I decided to check the whole system. I drained the tank using the drain plug. Filtered the fuel and saw crud in it. So, I flushed the tank. Next I fitted a serviceable glass filter between tank and new pump, put new flexible pipes. New filter under the bonnet. Used Millers additive in the first few tankfulls to hopefully flush clean the solid pipes and injectors. Car went really well after that.
The lesson, I think, is that the car was 20+ years old so the fuel system was due for a bit of refurb. Luckily the tank had the drain plug which meant draining/flushing was easier. As a check I put 1 gallon into an empty tank and looked at the gauge on the dash. I then knew where the safety margin was! Mind you the gauge would fluctuate a lot on cornering. If draining the tank it would be a nice touch.
Just to edit......I flushed by draining, filtering and using the filtered fuel to slosh round thetank. As far as I could see the interior was good and no crud after the 3rd flush.

Last edited by sospan; 16/01/19 02:41 PM.

Red Plus8
Re: Won't idle..... [Re: TBM] #554170
16/01/19 08:18 PM
16/01/19 08:18 PM
Joined: Nov 2018
Posts: 529
Northants, UK
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Northants, UK
Anyone know the idle jet size on the Weber twin choke carb?

Thinking about getting a spare for a quick roadside swap if it happens in future? I could just whip the original out and clean it, but knowing me I'll drop it and it'll roll down a drain so if I have a spare at least I can get home!


1972 4/4 4 seater
Too many ratty motorbikes
Re: Won't idle..... [Re: TBM] #554172
16/01/19 08:36 PM
16/01/19 08:36 PM
Joined: Aug 2008
Posts: 2,056
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tmg513 Offline
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Originally Posted By TBM
Anyone know the idle jet size on the Weber twin choke carb?

Thinking about getting a spare for a quick roadside swap if it happens in future? I could just whip the original out and clean it, but knowing me I'll drop it and it'll roll down a drain so if I have a spare at least I can get home!

Whip the jet out, it'll be engraved on the side. If the engine's been modified at any point it may have been re-jetted.


1972 4/4 2 Seater
Re: Won't idle..... [Re: TBM] #554326
17/01/19 03:56 PM
17/01/19 03:56 PM
Joined: Feb 2012
Posts: 626
Essex
jbk Offline
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Posts: 626
Essex
Back in the dark ages I had a similar idling problem, turned out be a shard of fibreglass in the idle jet, you could see right through the jet and it was not until I blew through it against the direction of flow that it lightly stuck into my finger. That was a Ginetta with a fibreglass fuel tank, but you might get a similar effect with a grain of sand, give it a blow, worth a try?


1993 T16 +4 Lancia Blue.
Re: Won't idle..... [Re: TBM] #554449
18/01/19 01:44 AM
18/01/19 01:44 AM
Joined: Sep 2015
Posts: 126
Massachusetts, USA
M
morgan_75 Offline
L - Learner Plates On
morgan_75  Offline
L - Learner Plates On
M

Joined: Sep 2015
Posts: 126
Massachusetts, USA
your slow running jets should be 50/45


'61 +4 DHC
'70 4/4
'80 4/4 4seater
Re: Won't idle..... [Re: TBM] #554481
18/01/19 09:19 AM
18/01/19 09:19 AM
Joined: Feb 2016
Posts: 1,842
East Harling, Norfolk UK
Richard Wood Offline
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Richard Wood  Offline
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Joined: Feb 2016
Posts: 1,842
East Harling, Norfolk UK
Over the years I've had a couple of cars when first purchased that wouldn't idle properly or for a period of time before stalling.

On a newish Sunbeam Imp Sport with twin Strombergs, I discovered the plastic float in one of them was leaking so full of petrol, in turn causing over rich carb. New float and perfect idle.

On an early 911S rough idle just needed distributor tweak to correct poorly set up ignition timing.


Richard

2018 Roadster - Red/Magnolia - "Morton"
1967 Land Rover series 2a SWB
1960 Velocette Venom
Re: Won't idle..... [Re: TBM] #555279
22/01/19 07:42 AM
22/01/19 07:42 AM
Joined: Nov 2018
Posts: 529
Northants, UK
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TBM  Offline OP
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Joined: Nov 2018
Posts: 529
Northants, UK
Been running fine all weekend. Fitted a new fuel filter and popped out one of the idle jets (the one on the opposite side to the engine) and gave it a blow through - it's a 55. Will get a spare for emergency roadside swapouts.

Checked the history that came with the car, and she had a full fuel tank clean by Allon White about 8 years ago, so I imagine it's just a bit of surface rust (hence small particles that are clearing themselves). It all depends if she's been kept with a full tank of fuel or not. It might explain why she plays up with a full tank - slight corrosion on the upper surfaces which gets dislodged when full.


1972 4/4 4 seater
Too many ratty motorbikes
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