Any SU HD6/AED experts in here?
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Senior Member
Joined: Jul 2017
Posts: 439
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From: Næstved, Denmark
Don't be so quick to write off fuel supply. The tanks are interlinked & just a minor drop of fuel pressure at any speed/load can cause loud popping, misfiring, backfiring, stumbling etc. Remember these fuel systems run in the 1.5 to about 3 psi range.
This air leak on the left tank caused mayhem on either tank or pump where there appeared to be good pressure up front. Had us foxed. Seemed to be plenty of fuel at the fuel filter & carbs. But the engine would pop, backfire & stumble when loaded in numerous conditions.
Carefully check your fuel supply from rear to filter even if all seems fine up front with plenty of fuel & a full glass bowl (well as full as they get)
This was still semi pressed on the metal pipe & no smell of fuel.
This air leak on the left tank caused mayhem on either tank or pump where there appeared to be good pressure up front. Had us foxed. Seemed to be plenty of fuel at the fuel filter & carbs. But the engine would pop, backfire & stumble when loaded in numerous conditions.
Carefully check your fuel supply from rear to filter even if all seems fine up front with plenty of fuel & a full glass bowl (well as full as they get)
This was still semi pressed on the metal pipe & no smell of fuel.
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Joined: Jan 2013
Posts: 5,253
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From: Calgary, Canada
It could certainly be the carbs, the bottom of the HIF's can collect junk and corrosion if water gets in there. If it's not too difficult to access, it can be worth removing the bottom plate and see what's in there.
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Joined: Jul 2012
Posts: 5,546
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From: Llandudno, Cape Town, South Africa
This had a number of specialists confused on my car. I flicked to the left tank & the trouble started. Flicked back right ~ no change.
Only cured when we found the cracked pipe from E10
Only cured when we found the cracked pipe from E10
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