Hi all, Looking for a bit of advice. Clearly have fuel leaking in the engine bay but cannot source it. Type 4 engine with twin 34 Webers fitted. Fuel lines into engine bay is sound and t-piece is dry, lines to both carbs dry - no inline fuel filter either. Both carb bodies and manifolds dry but there is obviously fuel leaking (slow drip) off of the bottom of the case. Any ideas? Is the fuel pump in there somewhere and goosed - ideas on where to look? Decided to take a punt and fired her up - she was flooded but eventually sparked up and ran well but still nothing got obviously damp.... pondering...
Its probably the carbs leaking into the intakes then out of the cylinder heads. Why ? you mention flooding and this is a clue to check needle valves and float heights..
After I ran it it's stopped leaking (just checked an hour later). Will check in the morning but suspect running it has cleared the carbs, if the float heights change again will know.
Will do - probably tomorrow evening. Going to have a nose around the fuel pump. Give everything a wipe and see what's what.
Will check the oil tomorrow when I give it a proper looking at. If it does then I'll change the oil before I drive it again. I've been consulting my Bentley manual and it says the fuel pump is near Cylinder 1. If that is the case then I suspect (whcn I check) I will find nothing wrong there. The bus is facing nose downwards on a slight slope on my drive yet the front (near flywheel) end of the engine is dry. Drip is near the sump plate. S I suspect I've got a carb issue and fuel is now in the case/oil. Lots to check but I'm not using the bus for a few weeks so have time to take my time.
Latest situation. Fuel pump is dry. Underneath cylinders 1 and 2 is dry. Underneath 3 and 4 - soaking wet and then running onto case where it is dripping down onto the driveway. Checked oil - clear as you like and stinking of fuel. So, I have clamped the fuel line running to the left hand carb and cleaned underneath the engine and laid down some dry paper to see what happens over the next few hours. Pretty certain this is telling me I have a carb issue on cylinders 3 and 4 and this is causing fuel to pour down the inlet manifold, into the head and then down the pushrod tubes into the case (I'm assuming the piston rings are doing their job and its not getting in that way). Any comments - next steps?
I think I saw Robert parry say that fuel can't go down the valve tubes as they're angled the wrong way,
Depends how full the head is. A T4 in my workshop spunked gallons through an ICT carb overnight, it was coming out as described above, huge puddle under the van.
This! Checked all of the lines an they are dry so we're not talking a transfer issue. Going to dig out my paperwork on the carbs after the Wales gam and check specific model no.s and also see if the paper under the van is dry. It's been there 20 mins now and not a drop....
Fair enough, my personal knowledge of this is nil ! Thought maybe worth a mention ( But I did remember correct ? )
So going out there and looking this morning. One tiny drip on the paper which I think is probably residual build up. My theory is now that because I only clamped the fuel line to the left carb and not the right that this probably rules out excessive fuel pressure from the pump (as otherwise I would have had an overnight leak from the right carb). This now points to some issue with the left carb. I've never fiddled with one of these before but am willing to give it a go. Any obvious first places to look. It looks like I'll have to take off the filer, disconnect the linkage and take off the filter mounting plate to get to the main carb body - so should I look elsewhere first?
If they are ict's it's probably syponing. A fuel cut of switch is the answer if that is the problem Sent from my SM-N910F using Tapatalk
Can you elaborate on this a bit? They are ICT's but I've not had a chance to go out there today - TBH not sure I want to take them about and start prodding. Where did you source this and how did you fit it? Thanks, JS
