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#554079 - 16/01/19 10:15 AM Re: Won't idle..... [Re: Graham, G4FUJ]
TBM Offline
L - Learner Plates On

Registered: 06/11/18
Posts: 151
Loc: 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

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#554082 - 16/01/19 10:33 AM Re: Won't idle..... [Re: TBM]
tmg513 Offline
Talk Morgan Enthusiast

Registered: 27/08/08
Posts: 1858
Loc: Powick
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

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#554089 - 16/01/19 11:01 AM Re: Won't idle..... [Re: tmg513]
TBM Offline
L - Learner Plates On

Registered: 06/11/18
Posts: 151
Loc: 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

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#554128 - 16/01/19 02:38 PM Re: Won't idle..... [Re: TBM]
sospan Offline
Charter Member

Registered: 31/05/10
Posts: 5816
Loc: 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.


Edited by sospan (16/01/19 02:41 PM)
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#554170 - 16/01/19 08:18 PM Re: Won't idle..... [Re: TBM]
TBM Offline
L - Learner Plates On

Registered: 06/11/18
Posts: 151
Loc: 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

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#554172 - 16/01/19 08:36 PM Re: Won't idle..... [Re: TBM]
tmg513 Offline
Talk Morgan Enthusiast

Registered: 27/08/08
Posts: 1858
Loc: Powick
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

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#554326 - 17/01/19 03:56 PM Re: Won't idle..... [Re: TBM]
jbk Offline

Talk Morgan Regular

Registered: 10/02/12
Posts: 594
Loc: 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?
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1993 T16 +4 Lancia Blue.

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#554449 - Yesterday at 01:44 AM Re: Won't idle..... [Re: TBM]
morgan_75 Offline
L - Learner Plates On

Registered: 23/09/15
Posts: 122
Loc: Massachusetts, USA
your slow running jets should be 50/45
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'61 +4 DHC
'70 4/4
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#554481 - Yesterday at 09:19 AM Re: Won't idle..... [Re: TBM]
Richard Wood Offline
Has a lot to Say!

Registered: 03/02/16
Posts: 1400
Loc: 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"
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