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MG MGB Technical - Very poor running....

Have a problem with a 68 roadster - filled up with fuel about 2 months ago and not long after leaving the garage it stated spluttering quite badly on the slightest throttle increase.
Suspected a blocked fuel filter so got out the old haynes manual to discover that the filter is inside the fuel pump (I think) and not in-line as I'd imagined. Anyway didn't have time or tools to remove it and have a look but started her up nonetheless and she ran fine. Went for a 10 minute blast and all was well.
Yesterday however she started ok but after a few minutes ran like a dog again, just about made it back up the slope to the garage.
Does this sound like a blocked filter and if so any tips for removal of fuel pump as it's not to clear in the book?
Thanks, Neil.
Neil

I never like to be first to post but here goes. I don't think that the fuel filter is blocked so remove the fuel feed to the front carb and direct it into a bucket. Switch the ignition on and you should get good delivery into it. There is a filter in the fuel pump which is located under the flattish cap held on with a central screw however I doubt if this blocked as it is a fairly coarse gauze designed to keep back nuts and bolts. In any event the SU carbs are fairly dirt tolerant except for the needle valves.

Now remove the top of the float chamber from each carb and clean them out. Remove the needle valves and carefully clean them as well. Remove the carb dashpot covers and lift out the piston then blow the jet back into the empty float chamber to ensure that everything is clean. Put it all back together, fill the dashpot centre tube with engine oil and test the car again.

Now I don't think that any of us can be sure at this point exactly what is wrong but as you seem to suspect fuel lets try to eliminate that first before we move on otherwise you are all over the place. Just bear in mind that as this problem is intermittent it's not likely to be carb adjustment and you should not therefore be tempted to adjust them for fear of introducing further problems.
Iain MacKintosh

This thread was discussed on 18/08/2005

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