I just noticed this a few days ago.... When I turn the ignition to ON (engine not running) the pump makes a loud HUUUUMMM.... It only happens when its cold and the first startup of the day.... As soon as I start the engine, i hear nothing but the normal sound of it (just a slight hiss when I open the trunk)....
THe pump has been replaced within the last 6000 or so miles (before I obtained it)..
Fuel pump noise when priming!
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Q451990
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The noise is always more obvious to me when it's cold too... Judging by the pic in your signature line I'm sure it's a little frosty in that gas tank in the mornings 
As long as you don't hear it at idle you should be fine. I'd say a good replacement interval for the fuel pump in normal conditions would be 70-80K miles.
Heath
As long as you don't hear it at idle you should be fine. I'd say a good replacement interval for the fuel pump in normal conditions would be 70-80K miles.
Heath
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Q45tech
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- Car: 1990 Q45 342,400 miles 22 years ownership with original engine
1995 G20t 5 speed 334,000 miles 16" 2002 wheels - 205/50/16 Sr20ve vvl
More pumps are prematurely destroyed by failure to buy clean gasoline and failure to clean out the tank when a pump is replaced.
Takes a few extra hours, if the tank is nearly empty, and jugs to hold the old gasoline and 2-3 gallons of new gasoline to get to the station to refill.
But new pumps almost always last at least 12,000 miles [most 40-60k] or a year so the repairer is off the hook if he doesn't force you to spend the extra money for tank removal and cleaning.
Why orginal pumps lasted 100k+ and replacements fail sooner.
Takes a few extra hours, if the tank is nearly empty, and jugs to hold the old gasoline and 2-3 gallons of new gasoline to get to the station to refill.
But new pumps almost always last at least 12,000 miles [most 40-60k] or a year so the repairer is off the hook if he doesn't force you to spend the extra money for tank removal and cleaning.
Why orginal pumps lasted 100k+ and replacements fail sooner.
I have read several articles about hissing caused by the fuel pump. I've noted a small hissing sound in my 93 J30 for about a year now (it currently has 178k miles - I drive about 15k a year).
I'm not sure if it is the fuel pump, or just a character of the J30. It occurrs at start-up but then dissipates within about a mile (at least I don't notice it by then). I notice it when the engine is cold; that is about the only time I drive it - to and from work. Its not loud. I also notice that the sound stops if I put the car in neutral shortly after driving down the driveway, then resumes for a few minutes after engaging Drive.
Any thoughts? J30 Character or a true problem?
I'm not sure if it is the fuel pump, or just a character of the J30. It occurrs at start-up but then dissipates within about a mile (at least I don't notice it by then). I notice it when the engine is cold; that is about the only time I drive it - to and from work. Its not loud. I also notice that the sound stops if I put the car in neutral shortly after driving down the driveway, then resumes for a few minutes after engaging Drive.
Any thoughts? J30 Character or a true problem?
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VenCountyQ
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VenCountyQ
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Good point regarding the possibility of reduced fuel pressure, I'm going to check mine with a gauge. Any good fuel pressure gauges you can recommend? Although having just replaced the knock sensors ( both were cracked at 150K ) and cleaning the throttle body my car is running faster than it ever has. Any additional speed would be icing on the cake.
And yes while replacing the knock sensors I replaced every hose under and around the plenum ( fuel, air, PCV, vacuum, brake booster, coolant, heater, purge canister, EGR, IACV ). We need Joe to come up with the plenum-plus hose kit. Although it will probably cost close to $1000.
And yes while replacing the knock sensors I replaced every hose under and around the plenum ( fuel, air, PCV, vacuum, brake booster, coolant, heater, purge canister, EGR, IACV ). We need Joe to come up with the plenum-plus hose kit. Although it will probably cost close to $1000.
I finally got around to changing my fuel pump this weekend. It was humming away for quite some time and I was concerned that it was going to fry the controller and/or leave me stranded. Three hours on Saturday and I have peace of mind and no more humming.
I strongly recommend you get one from Joe and change it-easy project.
I strongly recommend you get one from Joe and change it-easy project.
wes, I am pretty sure it is different for the J - a bad pump wont off your control unit.
Even if it did, it is a $5 junkyard part.
PS . pump is a bosch part, local parts depot will offer them at about $200 as well. (not implying that you shouldnt go with Joe, just that there is that option in case of an emergency.)
Even if it did, it is a $5 junkyard part.
PS . pump is a bosch part, local parts depot will offer them at about $200 as well. (not implying that you shouldnt go with Joe, just that there is that option in case of an emergency.)
also, there is no real risk to the cats here.
dying pump=lower fuel pressure=lean mixture if anything=not a real risk for the cats, which are harmed by unburnt fuel, oil, or coolant entering the exhaust.
pretty good closed-loop feedback with the lambda sensors anyway, and he will see poor engine performance far before cats are at risk.
dying pump=lower fuel pressure=lean mixture if anything=not a real risk for the cats, which are harmed by unburnt fuel, oil, or coolant entering the exhaust.
pretty good closed-loop feedback with the lambda sensors anyway, and he will see poor engine performance far before cats are at risk.