Stalling when dizzy vacuum removed

Post by **Stesaw** » 31 Jul 2020, 12:20

DoubleOSeven wrote: ↑31 Jul 2020, 11:48

Cold Carb. This should be closed but it isn’t or wasn’t should I say. Still checking for air leaks.

Isn't that why you depress the accelerator once on cold start up to reset the choke? or am I thinking of something else?

Post by **DoubleOSeven** » 31 Jul 2020, 16:11

You are correct, depress the accelerator & it closes.

So, borrowed a carb., runs like a dream. So it is not an air leak.

However, initially it also struggled & stalled; why, low fuel, very low fuel. I've had this issue before, when I'm down to <5L it struggles for fuel pressure I assume. This does stack up, not enough fuel, air trying to compensate & over compensating.

So, filled it up with fuel on borrowed carb., seems fine. I'll run it for a bit; then swap my carb back on and I reakon it'll be ok.

(Thanks to Wilbur for borrowed carb., soon to go on his new singlecab - so a good run will do it good in preparation)

Post by **DoubleOSeven** » 31 Jul 2020, 16:14

Consensus to where Pierburg air/fuel mixture screw should be, for when I put my carb back on? It's been moved so much now, I don't now what's right..

3.5 turns anti-clockwise from closed?

Post by **937carrera** » 31 Jul 2020, 16:18

937carrera wrote: ↑30 Jul 2020, 21:28 "That much advance" is indicative I suspect of a weak mixture, so yes air leaks, including from that servo hose. Numbers are better than descriptions though.

I was starting to think blocked jets... but it could be either

Seems a decent chance that it's the latter rather then the former.

Easy to remove & clean, at least on a weber, don't know about those Pierburgs

I seem to remember 3.5 turns from elsewhere, itchyfeet will have a post, or James Akers website will have the answer

Post by **DoubleOSeven** » 31 Jul 2020, 16:59

Good shout, I was leaning towards blocked jets too, I'll clean them before putting it back on & check out james' site.

Post by **DoubleOSeven** » 31 Jul 2020, 17:10

2.75 turns out for air/fuel mixture screw on James Akers' ebay rebuild carb.

Post by **DoubleOSeven** » 31 Jul 2020, 18:17

Blocked Jet !

Post by **937carrera** » 31 Jul 2020, 19:29

Yay !

Blocked jet, reduced fuel, weak mixture, more advance required.

Nice easy fix, but you'll have to finalise the fuel and timing all over again

Post by **DoubleOSeven** » 01 Aug 2020, 10:54

All fixed, timing, mix, idle.

Running like a swiss clock again.

Summary; low fuel + blocked jet.

Post by **DoubleOSeven** » 08 Aug 2020, 17:21

It’s been an absolute pleasure driving the bus this week. Purring like a kitten. Best service it’s ever had.

Acton Field Camping, Swanage avoids the hoards at Tom’s Field next door. Shush, don’t tell everyone

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