Good spot
Shippers
Well-Known Member
Never noticed that...it should be full...
Hicap phill
Well-Known Member
Is that fuel filter fitted the correct way(look for the flow arrow) ?
Muddy goose
Active Member
Hi Rob
Yes mate I’ve got to that point after last night
Muddy goose
Active Member
No all the filters were in place the extra filter on the supply was purely just to see if there was fuel at the point of cutting out
Muddy goose
Active Member
Hi yes it feeds both carbs on a T to ensure both are fed both returns link back and I can see the fuel returning through the joint
Shippers
Well-Known Member
Does it always look like that in the pic?...I would expect that to be full of fuel with no air space...
Muddy goose
Active Member
Yes you did mate I did check with a stethoscope for noise and couldn’t find any do you think it’s uncheckable so replace it anyway?
Replacing valley gasket not done yet I will order a new one today. Yes I’ve got a mate who’s a good mechanic and it’s stumping him. The filter was on the feed just so I could see everything was ok when it cuts out.Need to read all that in the daylight
Sounds like you have done a bunch of testing and there maybe something in there.
A fresh pair of eyes may help as @Shippers suggested do you have a mate/friendly mech? Is there anybody with a V8 near you on LZ? Got to be.
I really can’t see what we are missing.
Is the filter on return or feed?
Something is breaking down under load, to me that is spark plugs and work back. Or coil and work other way.
Or a big vac leak under load? Thoughts?
Don’t give up
J
Shippers
Well-Known Member
Yes but it's got hardly any fuel in it it should be full ...I'll post a pic later of mine showing the filters between pump and carbs...
Hicap phill
Well-Known Member
@Shippers has your SU got the extra fuel swirl pots on the side of your carbs?
Now I know there is/should be a restriction for the return could this be blocked off to ensure the bowls are full of petrol?(restriction is in 1 of the brass joints)
If you have a facet pump this may stop as there is a pressure valve in them.
This problem is still stumping me.
Now I know there is/should be a restriction for the return could this be blocked off to ensure the bowls are full of petrol?(restriction is in 1 of the brass joints)
If you have a facet pump this may stop as there is a pressure valve in them.
This problem is still stumping me.
The SUs work on a low pressure if you block the return chance are the pump would just overcome the float valve and pump it straight into inlet.
If I remember we went over all this earlier (there’s been so much).
It would be good to see that filter full when engine running though.
@Muddy goose did you ever get a video of it running and cutting out?
Running low on ideas now
J
If I remember we went over all this earlier (there’s been so much).
It would be good to see that filter full when engine running though.
@Muddy goose did you ever get a video of it running and cutting out?
Running low on ideas now
J
Shippers
Well-Known Member
Pics show external pump which supplys direct to glass sedimenter\filter then across to blue canister filter then to carbs these are full all the time....the only non standard part of set-up is external pump....
Muddy goose
Active Member
I think you could only get that if you could bleed the filter body
Muddy goose
Active Member
Hi Yes that’s how I had mine before whilst still having the issue so changed made since and during the issue. I was finding that the LH swirl pot had less fuel than the right hand side hence putting a t joint in the middle of the two to supply both carbs the same amount. No it didn’t cure it
Muddy goose
Active Member
I must say again the same as the SU carb man said the cut off is not fuel as it just stops no coughing or spluttering I will try and take a video
Shippers
Well-Known Member
The pump will should fill that filter pushing the air out through the carb till the floats stop the flow...engine will stutter and misfire till all air out.
There is no bleed on my filters..
jamesmartin
Well-Known Member
those filters never fill fully and be best down stream on its side, presumably youve fitted a new coil and or dizzy amp they are the 2 things ignition wise that spring to mind of engine dying after it warms up
