Horace Posted May 12, 2015 Share Posted May 12, 2015 Hi AllThought I'd post this as may be of help to others. I have just tried to fit a fuel pump from Paddocks to a Mk3 spit. The pump didn't work, the reason being that when fitted the arm was pressed hard against the cam and there was no movement possible. On measuring the old vs the new, the distance from the end of the arm to the mounting face of the pump was identical to the old one (though the arm does look to be a slightly different shape). However, the old pump had a about 10mm of free movement before it actually started pumping and this was the key difference. After being a bit sceptical at first, Paddocks checked their stock and it seems that the pumps at the back of the bin had this free movement but the recent stock does not. If you have bought a pump from anyone and not yet fitted it, may be worth checking if you have the same issue before fitting. I note in other threads people have given up on mechanical pumps for found they have scored the camshaft badly etc. Just thought this experience may be of help to others. Paddocks are sending me a replacement so I'll see if it solves the issue. Happy with Paddock's approach by the by.Finally, I am thinking of rebuilding the old pump but it appears that the valves can't be dismantled as there are no screws holding them in (as shown on some diagrams of "early" pumps). My car is a 1970 mk3 - how early does the pump have to be to be serviceable - I'd assumed "later" meant mk4 or 1500 but presumably not. RegardsBob Quote Link to comment Share on other sites More sharing options...
RobPearce Posted May 12, 2015 Share Posted May 12, 2015 I believe some versions of the pump are supposed to be fitted with a spacer plate, which would go at least some way to alleviating the issue.I've done a rebuild of a Vitesse (glass bowl) pump in the past, and it wasn't too hard. I'm not entirely sure on the Mk3 Spitfire as mine has a 1500 engine and a fuel pump from a 13/60 Herald... Quote Link to comment Share on other sites More sharing options...
Horace Posted May 12, 2015 Author Share Posted May 12, 2015 Yes, I think a spacer would have made it about right but spacers were used on 1500s (and I think later mk4s) not Mk3s. Problem is that the studs don't look long enough if a spacer was used on a Mk3. Bob Quote Link to comment Share on other sites More sharing options...
RobPearce Posted May 13, 2015 Share Posted May 13, 2015 The factory didn't fit spacers until later, but that doesn't mean the suppliers of remanufactured parts aren't shipping 1500 type fuel pumps in boxes marked for a Mk3 :( Quote Link to comment Share on other sites More sharing options...
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