Fuel - Starting issue

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Gun7354

Gun7354

Well-Known Member
Posts
310
Location
North Yorkshire
Hi knowledgable folk, just trying to find out / gather ideas why my Series 3 2.25 fuel drains back so quick from the carb (Weber). Starts great in the morning from cold and if you leave it for 10-15 minutes when hot it'll start straight away. But, if i leave it for longer than 30 minutes it'll turn over quite a few times before it fires up!

As an example, drove 190 miles to Newbury towing a trailer and it was faultless. Stopped for fuel etc and left it for 30+ minutes. Got back in and it turned over a few times and fired up, drove up a slight hill out of the carpark it began to lose fuel and cut out! Popped bonnet, hand primed fuel pump (noticed no fuel in filter) and it started straight away and has been great ever since (less for when i leave it longer than 30+ minutes).

I 'think' it must be the fuel pump and the non-return values not working but open to other advice / ideas.

Thank you

Rich

P.S. All ignition parts have been replaced incl coil etc
 
Thanks Kermit,

Just need to check the plugs next time I crank it up after a break, that way I should be able to see if they are wet etc?

👍🏻
 
Gun7354 said:
Hi knowledgable folk, just trying to find out / gather ideas why my Series 3 2.25 fuel drains back so quick from the carb (Weber). Starts great in the morning from cold and if you leave it for 10-15 minutes when hot it'll start straight away. But, if i leave it for longer than 30 minutes it'll turn over quite a few times before it fires up!

As an example, drove 190 miles to Newbury towing a trailer and it was faultless. Stopped for fuel etc and left it for 30+ minutes. Got back in and it turned over a few times and fired up, drove up a slight hill out of the carpark it began to lose fuel and cut out! Popped bonnet, hand primed fuel pump (noticed no fuel in filter) and it started straight away and has been great ever since (less for when i leave it longer than 30+ minutes).

I 'think' it must be the fuel pump and the non-return values not working but open to other advice / ideas.

Thank you

Rich

P.S. All ignition parts have been replaced incl coil etc
Click to expand...
My 78' with a new weber does the same, I have a new fuel pump to try but I doubt it will help. It starts better with the choke on these days. I have fuel filter just before the carb it fills slowly when starting it up.
 
Gun7534

I got a chance to fit the new oem fuel pump from Paddock Spares today and it has helped with starting. The clear carb fuel filter fills a lot quicker now. Last year a rusty fuel tank caused me a lot of carb issues so I slowly replaced everything from the tank to carb. If the carb was full of rusty flakes blocking jets, then I'm sure the pump was full of them too.
I also noticed the filter gauze was missing from the old pump, don't lose it if you remove the sediment bowl.
 
Thank you, really useful. I’ve not looked inside my fuel tank for a while and not serviced the carb for over 5 years, filters all look fine ‘but’ I’ll take the hit and get a new OEM one from Paddocks.

The know the lift pump fitted is a copy with pressed in valves etc.

Need a real one 😉
 
So found my old ‘real’ one (see pics) but it still has the crappy pressed in valves. Stripped it down and gonna fit to see if it’s an improvement.
 

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