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PV, 120 (Amazon), 1800 General Forum for the Volvo PV, 120 and 1800 cars |
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PVf44 61 fuel pumpViews : 4445 Replies : 24Users Viewing This Thread : |
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Oct 14th, 2021, 11:55 | #1 |
arcturus
Last Online: Today 08:14
Join Date: Mar 2006
Location: Sagres Portugal
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PVf44 61 fuel pump
Hi,coming back from a run in the PV the car stuttered and came to a halt a«After a few attempts to re start I came to the conclusion that it was a fuel problem and had the car recovered to my home. I thought the quickest way to check was to lift the lid of the fuel bowls in the carbs and sure enough they were empty. I suspected a failed diaphragm so I removed the fuel pump and striped it down. The diaphragm was OK so I turned my attention to the check valves and as you can see in photo one appeared to be faulty. I have ordered a pump rebuild kit and intend to replace all the parts whilst the pump is off. My question is would the failed check valve alone cause the pump to stop supplying fuel to the carbs or should i be looking elsewhere.I strongly suspect the failed check valve but would like some confirmation. On previous occasions at high revs the car has stuttered but regained after I lift off,i had put this down to vapor lock in the hot climate.
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Oct 14th, 2021, 14:23 | #2 |
Premier Member
Last Online: Today 22:11
Join Date: Jul 2007
Location: Connecticut, USA
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arcturus;
Failed FuPu non-return valves can fail individually and intermittently, resulting in strange symptoms, before they fail completely, but I think it would be good to start with a careful inspection (to assure nothing which the rebuild kit doesn't replace is damaged) and to rebuild it...I expect you will find it will then once again do its job well... Cheers |
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Oct 20th, 2021, 13:02 | #3 |
arcturus
Last Online: Today 08:14
Join Date: Mar 2006
Location: Sagres Portugal
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Before I re fit the overhauled pump,two questions. First,why two gaskets between pump and block and secondly,the rubber "washer" included in the repair kit,nothing like this came off the pump.Any idea as to its purpose?
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Oct 20th, 2021, 14:48 | #4 |
VOC Member
Last Online: Today 16:54
Join Date: Jul 2006
Location: Chatham
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Gaskets go one each side of the paxolin spacer. Rubber washer may go on the diaphragm pushrod and is easy to damage when fitting.
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Oct 20th, 2021, 18:33 | #5 |
arcturus
Last Online: Today 08:14
Join Date: Mar 2006
Location: Sagres Portugal
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Bummer,after all this I find that it's not the pump after all,there is a fuel blockage somewhere in the system.I am going to try to find some sort of pressure pump and try blowing back down the fuel pipe. Is there a strainer in the tank? Any advice most welcome.
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Oct 20th, 2021, 20:42 | #6 |
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Last Online: Today 22:11
Join Date: Jul 2007
Location: Connecticut, USA
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Arcturus;
May I remind you that you may forgotten the first rule of troubleshooting: Check the simple things first! Tip for reassembly: The FuPu Spacer is brittle (I thought it was of Bakelite, but apparently Derek has better info on this), so tighten the FuPu Bolts evenly, and finally less than if you were tightening upon a stack of metal! I can't shed any light on what the rubber part might be for either... There is no strainer in the Tank that I am aware of, but a Pick-up Tube to the bottom of Tank. Before using "some sort of pressure pump", I suggest you simply connect a short piece of hose onto the Tank line and blow the blockage back into the Tank (remove Tank Cap to allow this!)...often, such a blockage consists of many rust particles, so this may be enough...alternately, you could a little pressure from a can of carb cleaner snoozle into the hose... One a cleared path has once again been established between Pump and Tank (and you know there is some sort of debris in the Tank), I suggest you plumb a fuel injection fuel filter (so large, with a large filter surface area) in, immediately at the Tank (this my require cutting the hardline to add it in), and have a second FuFi handy for quick changeover when Fufi is blocked (these can be back-flush to remove and allow inspection of debris, and can be reused or replaced)...this will allow you to capture the debris...eventually, you will prevail. Good Luck! |
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