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Hi,
It would help if we knew about how many miles are on that pump or on the car itself.
Checking the fuses and having that good relay was very smart of you!
Owning these Volvo’s will always be a good practice to have that kit!
Be glad you don’t have the newest cars as all the pumping stuff is inside the fuel tank and the parts are as high or higher than the labor!
They will want as much money to fix the newer cars, as they will be worth, at half the ages of ours!
The original Bosh pumps that come on these cars or you buy later, can easily go 200,000 miles.
Past that, you can be on borrowed time with the longevity of brush wear inside the pump.
The best thing is to insure that the wire connections on the pump are tight and clean.
The females part of the connectors clip can get weak and not fit as tight as it use too.
If the pump has been replaced by an off brand pump the connectors may have been spliced or other wise jury rigged to work on it.
You will need to crawl under there to inspect the pump housing anyway.
You will want to be aware of noticing to see it still has sprayed body coating on the outside of it. If it does, it’s probably the Bosch original pump and it’s time to replace it.
If the rear end of the pump it looks shiny and new, then the pump has been change at least once and maybe only once, depending on the overall mileage of the car! The coating “helps confirm” it’s a low mileage car! Do not always take that to the bank though, it’s just something to consider when buying used!
Marvel Mystery Oil shouldn’t do any harm to the pump at any time. I’m skeptical that it does anything, when mixed in several gallons of gasoline, as it’s too thin already.
It might do more of “something,” if you put in your ears to remove ear wax!
I might give it some merit if used in the engine oil and that is questionable!
I use a few drops their air tool oil in my equipment and have experimented with MMO on other things of that nature.
I compare, MMO to Rislone, both an oil additive, to be more of a detergent cleaner for piston rings and valve stem guides. Both remove varnish resin from hydraulic lifters, but these engines don’t use them.
As far as hearing a noise out of that pump upon shut down, is very unlikely, as it is only a roller pump. Hearing it sounding off louder later, I can believe that.
Smacking it and it started working again is a normal scenario!
If it’s excessively worn or the connections down there are going bad, then, it should be treated as a good heads up warning to jump on it!
Phil
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