Vic787 Posted May 12, 2015 Report Share Posted May 12, 2015 hi everyone, help please. It started with a engine dying then restarting after pumping fuel through several times. I suspected dirt in tank as filter bowl contained debris. I removed tank which proved to be clean as we're all fuel lines. Blew through with airline. What I did find was that the tank only contained 5 litres of fuel and In hindsight I should have left it there and just put some fuel in. Removed and cleaned fuel pump and all seemed ok. On restarting engine both carbs flooded. I removed floats which appear not to have leaked, cleaned all lines and checked float valve and needles. All worked satisfactorily. On restarting the no1 carb flooded fuel from the breather. I didn't let it run long enough to see if no2 flooded. Sorry it's long but Help please, either what have I done wrong or what is likely to have gone wrong Vic Quote Link to post Share on other sites
RogerH Posted May 12, 2015 Report Share Posted May 12, 2015 Hi Vic, the float valves could have 'stuff' stuck to them. Fit new ones - easy job. Consider Grose jets - they work well. Roger Quote Link to post Share on other sites
Vic787 Posted May 12, 2015 Author Report Share Posted May 12, 2015 Thanks Roger, I have had a look at them and will get hold of a pair. I stripped the present valves down and cleaned them with brasso and they worked well against air from compressor but as far as I know there is very little to go wrong. I have even swapped my pump for the spare I carry to no avail. We are on the Jorvic Rally on Sunday or should I say may be. Thanks for advice Vic. Quote Link to post Share on other sites
Lebro Posted May 13, 2015 Report Share Posted May 13, 2015 The rubber tipped Su type work well also. Bob. Quote Link to post Share on other sites
Vic787 Posted May 13, 2015 Author Report Share Posted May 13, 2015 Well, straight out today and purchased new valves, fitted them and had another clean around, started up and immediately flooded with fuel pouring from the overflow. Now what? I have a glass filter in front of the carbs and noticed that this was unusually full of fuel, normally this only half full. As a last resort Before I removed the wheels and stored it, I changed the pump for a spare I carry. No more flooding and filter half full. I cannot fathom why. Did the pump create too much pressure. Could it have been pumping too much fuel? I am at a loss. Thanks for advice guys. Quote Link to post Share on other sites
stuart Posted May 14, 2015 Report Share Posted May 14, 2015 (edited) As you have changed the pump then I suspect it is indeed supplying too much fuel. If its a mechanical pump then you can shim it off its mount which will limit the stroke and thus drop the pressure, or fit a fuel pressure regulator. If its an electric one then a regulator is a must.I presume you set the float heights correctly too. Stuart. Edited May 14, 2015 by stuart Quote Link to post Share on other sites
BrianC Posted May 14, 2015 Report Share Posted May 14, 2015 Try resetting the float levels a little lower (i.e. use a slightly larger drill bit for the adjustment). I have done this after having my original pump properly rebuilt by Dave Davis. Prior to this I had also suffered problems with the valves not shutting off sometimes, due to debris from the disintegrating new rubber fuel lines which meant I had to clean the valves and chambers several times before replacing the rubber pipes with better quality ones. [N.B. All this occurred after the carbs had been rebuilt, tank flushed and new pipes fitted, so replacing original type valves or switching to Grose jets as some people have done is not necessarily the answer]. Quote Link to post Share on other sites
ctc77965o Posted May 14, 2015 Report Share Posted May 14, 2015 If the needle valves are sticking then a sharp whack on the float chamber with a lump of wood will fix it...if that doesn't fix it then debris in the fuel line is a likely cause...it may be that the small bits of rubber hose near The carbs are shedding chunks when you push the tube on to the fitting. Quote Link to post Share on other sites
Vic787 Posted May 15, 2015 Author Report Share Posted May 15, 2015 Hello everyone and as a result of your advice, I continued trying to cure the flooding instead of beating the car with a branch. It is now cured, running as good as ever and without a stench of petrol. I fitted gross valves and meticulously cleaned the carbs again. I had a misshap when I stripped the screw housing in the pump body which caused me to refit the spare but I used the original bowl and pump top housing. (Hope that makes sense) straight away the flooding stopped. The problem was to my mind in the pump but I still cannot fathom out how, why or what but it now works fine. Thanks everyone for your advice but I stopped short of clobbering the carbs with a log as it cured before I needed to. Thanks again till next time. Vic Quote Link to post Share on other sites
Vic787 Posted May 18, 2015 Author Report Share Posted May 18, 2015 (edited) Just an update on the above. The car failed due to lack of fuel delivery on the way to the Rally. It turned out to be a blocked filter which was fitted just before the carbs. I planted it on a ditch and replaced it with a pipe. While I was having the problems this filter looked clean and I had back filled and cleaned it obviously not very well. A filter was fitted to the car when I bought it 20 years ago and I kept replacing it as time went on. Edited May 18, 2015 by Vic787 Quote Link to post Share on other sites
littlejim Posted May 19, 2015 Report Share Posted May 19, 2015 During a period years ago when Canberra petrol stations were supplied with several doses of dirty fuel, fuel filter blockages became the norm for most of us. The Merc had and external filter near the donk. I got into the habit of taking the filter out of the fuel line, connecting it to the fuel supply line back to front, and running the starter for a few seconds to backflush it. Usually took a few hundred Kms to block again. (Eventually the fuel companies started supplying clean fuel.) Quote Link to post Share on other sites
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