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Hi all anyone know if the fuel shut off valve ( if that's what it's called) should have free play? I.e when it's pressed it seams to have a spring inside that pushes down before the valve moves up to cut off the fuel. Is that right? Hope this makes sence!
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MrSpeedy
East Midlands
www.vintagediesels.co.uk
Posts: 4,786 
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Do you mean the needle valve that controls the fuel into the float chamber?
I vaguely seem to recall it is conected by spring to the float, but it should move straight away with the float rather than delayed via the spring.
I can't be 100% tbh, as it's ben a while since I rebuilt one
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Yes that's it. I thought too is should move straight away
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sowen
Club Retro Rides Member
Posts: 2,245
Club RR Member Number: 24
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Su hif44 carb helpsowen
@sowen
Club Retro Rides Member 24
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Some of them do have a sprung loaded pin on the opposite end to the needle seat, I'm not sure what the exact reason is for it though, but it's there for a reason.
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MrSpeedy
East Midlands
www.vintagediesels.co.uk
Posts: 4,786
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Yeah, some have a spring pin in the needle itself. It's to help stop the needle bouncing with vbration which could cause too high a fuel level and thus overfuelling. I think!
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Thanks for the replies I presume all is well with it then. The carb dosent seem to be getting any fuel into the chamber.The carb has an fuel cut off valve on it :-( so that may be the problem although apparently they fail in the off position, can it just be removed and blanked off somehow ? It seams to work when I put 12v through it but maybe air is leaking past the seal?
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The carb itself?
It's been answered, but yes there's a spring in there - I'm just not sure what this "fuel cut off valve" you speak of, is. I do however have a HIF44 a few feet from where I'm typing.
What engine is this from/on? The Turbo HIF44 is slightly different to the n/a HIF44...
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Bluefox
Current: '84 Golf C 1.9 TDI | '01 Polo 1.6 GTI | '01 Audi A2 TDI SE | '83 MG Metro | '06 Daughter!
Previous: Yep.
Metro Build Thread: bit.ly/1d7sdsr
VW Golf TDI Build Thread: TBC! |
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Carb is from a maestro but its going on a spitfire 1500 engine.carb has shut off valve on one side did have the dyphragram choke
Set up on the other, this is disconnected and the two pipes joined.
There is fuel in the bottom but it doesn't seem to go up the needle, fires fine on easy start!
Ideas please!
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sowen
Club Retro Rides Member
Posts: 2,245
Club RR Member Number: 24
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Su hif44 carb helpsowen
@sowen
Club Retro Rides Member 24
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Have you tried starting it with 12v on the solonoid? Some carbs do have idle cut off solonoids to stop running on.
Apart from that, is the float level set correctly?
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I'll try 12v tonight
I've set float as Haynes
Main jet 2 turns down from level
Carb cleaned out
Only other thing I haven't done is take apart the choke device
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MrSpeedy
East Midlands
www.vintagediesels.co.uk
Posts: 4,786
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I'm a little curious as to why you're fitting an HIF44 to a Spitfire and not using the twin HS4's.
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I'm a little curious as to why you're fitting an HIF44 to a Spitfire and not using the twin HS4's. True, but possibly the same reason people use a single HIF44 on Minis/Metros: does it not help torque using a single carb over the twins? Either way it's less hassle as you don't need to faff with balancing the two. I'm still a bit stumped by this whole fuel cut off thing. The anti run-on valve I've seen on most engines that use a HIF44 is a separate valve mounted on the bulkhead, although an electric cut-off solenoid does tend to make more logical sense. This is a silly question perhaps, but have you checked the fuel flow to the carb from the pump? |
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Bluefox
Current: '84 Golf C 1.9 TDI | '01 Polo 1.6 GTI | '01 Audi A2 TDI SE | '83 MG Metro | '06 Daughter!
Previous: Yep.
Metro Build Thread: bit.ly/1d7sdsr
VW Golf TDI Build Thread: TBC! |
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...fires fine on easy start! Hang on, does it fire and run? Or does it just fire whilst it's running on Easy Start and then die? |
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Bluefox
Current: '84 Golf C 1.9 TDI | '01 Polo 1.6 GTI | '01 Audi A2 TDI SE | '83 MG Metro | '06 Daughter!
Previous: Yep.
Metro Build Thread: bit.ly/1d7sdsr
VW Golf TDI Build Thread: TBC! |
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Had it running but lots of fuel was coming out the carb overflow, cleaned it up and now only a splutter, hence why I thought it was the needle above.
The fuel cut off is an economy device bolted to carb
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