Power loss

Morning campers.
Experiencing intermittent Occasional power loss after filling up at petrol station.
Occurs when we pull off and join the motorway, engine temperarily cuts out and looses power. Feels like engine flooding or loose ht leads?
Any thoughts or suggestions would be welcome.
Twin Weber’s on a new 1641 twin port engine.

 

Possible fuel vapour lock ? Are tank breathers clear ? Is there a hiss of air when the filler cap is opened and does that temporarily cure the problem?
Just a thought as you have a full tank of fuel now
Or as you stated a dodgy connection on the ignition side ?

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Crud in the carbs?

 

Does sound like fuel starvation. Sediment in the tank has been disturbed and is causing a blockage somewhere? Do you have a fuel filter and does it need changing?
Is your fuel pump pumping healthily?

 

Fuel - check filters and the rest

BTW ...
What`s hanging down ??
Breather pipe or wires for the number plate light ??

 

It may need insulating spacers under the carbs. Petrol is boiling after stopping suddenly with hot heads and the short manifolds. May also be tuned too lean and the heads are getting extra hot.

Its the opposite problem to centre mounted carbs ...

 

as above fitted the spacers from eurocarb but that was mainly took a while to fire after stopping on long trip, I also have breathers to top of metal filters and a fuel regulator fitted, is that large diameter hose fuel hose !!!!

 

Mine started doing that and it was me fuel pipie collapsing close to the tank

 

Thanks for suggestions,very useful. Going to try and install a t junction on the join of the breather pipes and a breather pipe tapped into an air filter. I am getting a hiss when I unscrew the fuel cap. Looks like my breathers are joined together as baysearcher suggests

 

Hopefully this will sort it. Will report after bank holiday weekend!
Happy camping.

 

So...lovely weekend in East Sussex but...on the way down we experienced splutterings again after filling up. Got up to 40mph as I re joined the motorway and the spluttering started, kept going and spluttering cleared and we achieved 55mph comfortably.
Way home was worse. Spluttering around 35-45mph. Slowed down on M25 from 55mph to 30mph, traffic thinned out and went to pick up speed and the engine wasn’t interested and started loosing power. Help my nerve and it cleared again...
Will
Talk to euro carb about the spacers. Can is going in to the garage this month. Cant have this on a new engine!

I did notice when the got home that the filter king was only half full of fuel, not sure if this is normal?

Any thoughts?

Thanks fellas.

 

Move the filter below the carbs .

 

Also
Worth mentioning strong fuel smell when I got home coming from the right hand rear air intake vent. Fuel hoses are all new with the new engine fit last summer.

 

It looks sweet . By the way ...I'd lose that filter king. Just for now. Get a normal fuel filter. Lower it down. Zip tie to something. Temporary .,And see if it happens again. Looks like its sukin air . Mechanical or electric pump .?

 

Thank you. It’s has a 123 electronic ignition.

 

And a Mechanical fuel pump I think!

 

This is a picture of the fuel pump whilst we were fitting up the new engine

 

Mechanical . = Perfect for carbs .

 

You will still need the fuel regulator for ICTs as the mech pump puts out too much pressure. ICTs need about 2.5psi, the mech pump pushes out up to 7psi.

My filter king is in the same position and all is fine.

Reading all the above I suggest you start with the basics and clean out both carbs. I had the same symptoms and there was a tiny bit of crud getting caught in one of the jets. Take each one out in turn and blow them through. Check the float chamber too.