Fuel Pump noise
Joined: Jun 2005
Posts: 1,498
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From: Meifumado
Fuel Pump noise
For those with a Walbro pump/and or return fuel system, do you hear a "hum" coming from the back?
I was told high performance fuel systems can be louder. The "hum" is fairly pronounced when at idle, but not noticeable when driving (b/c of engine/exhaust noise).
Any way to lessen the "hum"? dynamat maybe?
I was told high performance fuel systems can be louder. The "hum" is fairly pronounced when at idle, but not noticeable when driving (b/c of engine/exhaust noise).
Any way to lessen the "hum"? dynamat maybe?
Joined: Jun 2005
Posts: 1,498
Likes: 1
From: Meifumado
Originally Posted by express705
normal...
although my car is so loud, dynamat isnt going to do ****.
although my car is so loud, dynamat isnt going to do ****.
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Joined: Dec 2003
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From: Marietta, Georgia
As the pump wears from dirty gasoline and ethanol/water corrodes commutator and pump brushes, the pump rpm slows down and down and the pitch becomes audible. Important to frequently change gasoline filters to minimize wear and to clean tank of accumulated microscopic wear particles that settle and concentrate near pump intake sock.
Oem sound deadening IS TUNED for a new pump so that any wear becomes noticeable and leads to pump replacement befor failure.
The newer returnless system only pump the gasoline as used so they have to pump 1/5- 1/15 of the gallons per hour that return line system deal with, should have a longer life except the pressure has increased from 34/44 to 51-60 psi.
Oem sound deadening IS TUNED for a new pump so that any wear becomes noticeable and leads to pump replacement befor failure.
The newer returnless system only pump the gasoline as used so they have to pump 1/5- 1/15 of the gallons per hour that return line system deal with, should have a longer life except the pressure has increased from 34/44 to 51-60 psi.
Joined: Jun 2005
Posts: 1,498
Likes: 1
From: Meifumado
Originally Posted by Q45tech
Oem sound deadening IS TUNED for a new pump so that any wear becomes noticeable and leads to pump replacement befor failure.
B/c I have heard my fuel system since the day I got it.
This explanation seems plausible to me:
Fuel density and volume changes with tempratures. The sligtly denser fuel will cause a slightly higher strain on the pump. Not too much, but probably enough to change the pitch sligtly diffrent than what your use to and bringing it to your attention. It's not that it may be lounder but probably at a diffrent resinanace than your use to.
Hell I notice that even in Hawaii. In the summers when its warmer all the time its has a slightly lower pitch, not much strain. In the winters when its a little cooler in the morning and warmer in the afternoon I can hear the pump in the AM and the noise goes away closer to mid day.
IMHO, Such is life with a high volume fuel pump.
Hell I notice that even in Hawaii. In the summers when its warmer all the time its has a slightly lower pitch, not much strain. In the winters when its a little cooler in the morning and warmer in the afternoon I can hear the pump in the AM and the noise goes away closer to mid day.
IMHO, Such is life with a high volume fuel pump.
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