Another carb question = flat spot

[300CE]

I've got the Facet all ready in my watch list on eBay Ralph. Will be a purchase being made if the problem persists after tomorrow!

[itchyfeet]

Went out in mine today John & the problem has gotten worse, really kangarooing now and needing full throttle to pull away & smells rich. Put some fresh fuel in & got a mate coming round tomorrow to help us have a look at the carb (wondering if the choke is sticking) & fuel pump. I know your symptoms aren't as bad as this but will keep you updated if i can resolve it.

My guess is your problem is different, sounds like over fueling, main gasket or accelerator pump membrane perhaps
pump problems are likely to be fuel starvation.

anybody with a dg / 2e3 who hasn't invested in a rebuild kit is on borrowed time imo.

[CovKid]

Agree. Transformed mine with a new gasket/diaphram/valve kit. Amazing how much difference it makes. Just under £40 on the bay I think.

The diaphrams do suffer if not used and gum/crap soon makes a carb descend into "bloody thing - what now???"

[300CE]

Cheers itchy, I'm running a Weber on mine and the van has been running really sweet up until last week. Got a few things to try out & will report back (apologies in advance John for hijacking the thread mate)!

[itchyfeet]

Oh yeh, didn't see the webber in your sig, same principles though smells of fuel/ needs open throttle, likely overfueling often by gasket or membrane failure.

[300CE]

Thanks again chaps, may need a new kit for it then so will do the usual checking, cleaning etc. & contact webcon if I have no luck.

[ghost123uk]

I had annoying probs with flat spots mid-range. Turned out to be the pump. If you've not used petrol in a long while John, the pump diaphragm may be cracked.

Ah, but remember (rtfm ) this is not a new issue, been the same for many years, including another motor, therefore another fuel pump. Plus I do use petrol at least once every two weeks because I let it run out of LPG, then drive to the nearest LPG outlet to wherever I happen to be at the time.

I am now (as mentioned back a page) thinking slight blockage and might take the carb off and have a look today as it's quite sunny (but bliddy cold). Also need to check in my T25 spares box that I still have a top gasket. I did buy 2 last time but cannot now remember if I have used both of them. On that subject, I seem to remember they were quite expensive (and no, I ain't going to try making my own, simple gaskets = yes, but NOT carb top gaskets !!)

Bear in mind also that mine is not a big problem, but you can feel a slight flat spot. iirc I have read a good few times on here of folks with a mid throttle flat spot, which is one reason I was leaning towards an issue with the secondary butterfly vac unit not operating correctly (but not failed completely), thinking it might be a fairly common issue (which a minor/partial jet blockage would be less common)

[CovKid]

Making top gaskets isn't hard. Just hold a sheet in place and press down hard around edges and holes with your fingers to get the outline - then cut out. Up to you though

[ghost123uk]

Umm, in the past I have had poor success cutting such fine holes and contours, but that is likely because I was trying to do it with the wrong tools of course ! (K.i.t.c.h.e.n scissors and a Stanley knife - not literally btw )

Found gaskets on Ebay HERE for £6 = not too bad.

Still looks VERY frosty / icy through my front room window and tomorrow my LPG supplier will be open again after a long Christmas break = the job can wait

[300CE]

OK, just an update on mine John, took the vacuum advance pipe off of the carb and blew through it - all seemed to be working ok, however, started the van back up and it's now running a treat - no flat spot at all. Might be worth giving that a go just in case. Looks like mine is giving up & will probably get a new dizzy as one of the things I haven't replaced yet.

[ghost123uk]

Glad you got yours going, but I don't think mine is to do with ignition/timing/dizzy issues as mine runs just fine on LPG.

[300CE]

Glad you got yours going, but I don't think mine is to do with ignition/timing/dizzy issues as mine runs just fine on LPG.

No worries John - keep us updated on how you get on.

[itchyfeet]

Ran mine for 20 miles on petrol today and it was fine, I have to say there is slightly more power on lpg but that may be the closed loop.

I have a spare 2e3 i got becuase mine had a broken choke, it too has a flat spot on petrol only but I never fitted a rebuild kit or new gasket, I ran it for a year or so until I fixed the origional carb choke, fitted a rebuild kit to that and that's back on the vehicle so interested to see how you get on.

I read somewhere the splindles can wear and leak air in, dunno if that would cause the same on lpg I would have thought so but maybe not if lpg is running rich at that point.

[kevtherev]

To add to itchys point, LPG will run at a weak mix it won't show the lumpiness of a petrol system, I can turn my LPG down until the van struggles to move, but the engine still continues to run.
I can say that a flat spot due to a carb fault will simply not be detectable unless it's catastrophic.
So lets not get carried away with dismissal.
let's be methodical