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Author Topic: 2.25 petrol starvation?  (Read 624 times)

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2.25 petrol starvation?
« on: 01 April 2013, 10:26:01 am »
Hi Guys
I require help from those much more experienced than I.
I have a 4 cylinder petrol in a series 3 109 (high compression version).
99.9% of the time it goes like a train (well for a Land Rover anyway)
BUT the problem occurs when it is turned off after a descent run (half an hour or more).
If the vehicle sits for about ten minutes and then started it runs fine for about a minute then displays all the symptoms of fuel stravation. It misses, cough and splutters. I am sure it is fuel stravation because pulling the choke out eases, but does not cure the problem. After several minutes of misbehaving all becomes well again and there are no more dramas until after the next "hot" start.
The engine stock apart from a webber carby and an electronic distributor.
I have replaced the fuel pump and rerouted and insulated the fuel line with no change to the problem.
When first stopping the carby is cool to touch but after 10 mins is almost too hot to hold your hand on. Is this normal?
It feels like the engine uses all the fuel in the carby and then has trouble getting additional fuel in sufficent quantities to keep it all going.
What have I missed?
Please help it is driving me nuts
Cheers
Alan
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Alan Wilkin
Eppalock Victoria Australia
Land Rovers are like beer One is never enough

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Re: 2.25 petrol starvation?
« Reply #1 on: 01 April 2013, 12:11:33 pm »
You have mentioned the problem already. My suggestion is to remove the Weber 34ICH and use it as a doorstop. They're ****. Originally designed for an 1100cc Ford engine. It has it's supporters but I'm not one of them. Use a correct spec Zenith 36IV (or indeed a later "Solex" 36IV labelled unit, which is identical) or better still find a pre-1967 Solex PA40 carb, if you can, and you will find it more torquey, less thirsty, and all together a smoother drive.
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Re: 2.25 petrol starvation?
« Reply #2 on: 01 April 2013, 12:29:41 pm »
I couldnt get mine to run right on a webber. Stuck a zenith on it and it drove like a new vehicle.
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Re: 2.25 petrol starvation?
« Reply #3 on: 01 April 2013, 06:10:23 pm »
Quote from: Parn on 01 April 2013, 10:26:01 am
What have I missed?

Do you have twin tanks (i.e. ex-military 109)?

If so, check the cork seal in the changeover tap. I've had issues going back some time with the ambulance, it's had 3 fuel pumps and 2 carbs and still exhibited fuel starvation (worst under load) and I only discovered last week the fuel tap was the culprit, swapped that for another and it's as good as gold now. Cork seals can be had on eBay for less than 3 quid.



Other than that, Jim speaketh the truth. The Weber 34ICH is fit for target practice but not a lot else in my experience, a Zenith or Solex is the way to go.

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'55 107 truck cab ✪ '66 109 hardtop ✪ '66 109 LHD ex-MOD ambulance ✪ '71 109 one ton ✪ '72 88 2.5 petrol ✪ '72 2B FC Dorothy Perkins 4.236 ✪ '79 Lightweight LHD ✪ '79 109 LHD ✪ '83 109 FFR ✪'93 Dennis Rapier fire engine ✪'94 Range Rover Vogue Tdi...and an '86 SAAB 9000 turbo

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Re: 2.25 petrol starvation?
« Reply #4 on: 01 April 2013, 11:25:16 pm »
Thank you all for the prompt replies.
I will see if I can find a reasonable Zenith.
The original had badly ovalated the housing around the shaft for the butterfly valve.
Thanks again
Cheers
Alan
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Alan Wilkin
Eppalock Victoria Australia
Land Rovers are like beer One is never enough

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Re: 2.25 petrol starvation?
« Reply #5 on: 11 April 2013, 01:19:33 am »
Latest update:
I have removed the "in-line" fuel filter (and sent it to god)
I have replaced the Webber with a Zenith 361V which I have put a kit through and "flattened" all the mating surfaces.
I have also removed the fuel pick up pipe from the tank and ensured there is no blockage or obstruction in that or in any of the fuel lines.
The problem it is not as bad as it was BUT it is still straving for fuel at the top end of the "rev-range" immediatelty after a "hot start".
The only possible solution I can think of is the new fuel pump is dodgey.
I need some positive thoughts this driving me NUTS.
Thanks
Alan
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Alan Wilkin
Eppalock Victoria Australia
Land Rovers are like beer One is never enough

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Re: 2.25 petrol starvation?
« Reply #6 on: 11 April 2013, 07:54:09 am »
Just to ensure that your fuel tank is breathing correctly, try removing the filler cap before your next hot start. If the tank 'inhales' you'll have identified the problem.

Richard
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Re: 2.25 petrol starvation?
« Reply #7 on: 12 April 2013, 12:42:28 am »
Hi Richard
Thank you for your response
I forgot to mention I had removed the fuel cap vent and ensured it was working.
Once again it did not appear to have any restriction or any thing that would impede air flow other than the standard fibre plug. I put this back in and it appears to work
But I will try removing the cap whilst the problem is occuring.
Thanks Again
Alan
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Alan Wilkin
Eppalock Victoria Australia
Land Rovers are like beer One is never enough

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Re: 2.25 petrol starvation?
« Reply #8 on: 12 April 2013, 06:42:00 pm »
I had an issue with a brand new Allmakes pump causing the same symptoms come to think of it, the cure was a second had proper AC one I robbed off a scrapper. It could well be that.
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'55 107 truck cab ✪ '66 109 hardtop ✪ '66 109 LHD ex-MOD ambulance ✪ '71 109 one ton ✪ '72 88 2.5 petrol ✪ '72 2B FC Dorothy Perkins 4.236 ✪ '79 Lightweight LHD ✪ '79 109 LHD ✪ '83 109 FFR ✪'93 Dennis Rapier fire engine ✪'94 Range Rover Vogue Tdi...and an '86 SAAB 9000 turbo

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Re: 2.25 petrol starvation?
« Reply #9 on: 26 April 2013, 05:53:34 am »
If your carburetor is too hot to touch you probably have vapor lock.
Had a similar problem, fitted a aux. electric fan and temperature switch to keep engine temperature lower.

Cheers
Helmuth 
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Re: 2.25 petrol starvation?
« Reply #10 on: 26 April 2013, 01:07:00 pm »
The problem seems to have gone away, but hasn't been hot for the last couple of weeks (nice 25 degrees c).
I agree with you Noel the culprit must be the fuel pump. It is brand new but It doesn't appear to be "branded" so I assume it is "after market". I am going to try putting the spring out of a diesel lift pump in it and then wait until next summer to see if it is cured.
Thank you all very much for your help
Cheers
Alan
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Alan Wilkin
Eppalock Victoria Australia
Land Rovers are like beer One is never enough
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