Forced Induction Discussion of turbos , superchargers , and nitrous upgrades on the G35

How often do Walbro pumps go bad?

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Old Aug 18, 2007 | 12:10 PM
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i.love.gold
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How often do Walbro pumps go bad?

Just installed mine last night and everything works fine. Just wanted a heads up on failure rate of them. Might pick up a spare if I need to.
 
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Old Aug 18, 2007 | 12:24 PM
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I've hear they have issues, from time to time, but these should be very reliable. I actually have only heard of 1 or 2 that have had problems over the last few years.

Rick
 
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Old Aug 21, 2007 | 02:50 PM
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I'm on #2 but mine was only a bad check valve so it would not hold pressure and made starts hard. The swap is the pain, not the price of a new one.
 
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Old Aug 21, 2007 | 03:00 PM
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Originally Posted by ttrank
I'm on #2 but mine was only a bad check valve so it would not hold pressure and made starts hard. The swap is the pain, not the price of a new one.
What issues did you have with starting?
 
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Old Aug 21, 2007 | 03:02 PM
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The check valve was not closing so when it would first power up and push pressure on the line the fuel would just go back into the tank. So it was taking my car twice as long of a key cycle to start up. I replace the pump a while back and all has been good.
 
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Old Aug 21, 2007 | 03:16 PM
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Originally Posted by ttrank
The check valve was not closing so when it would first power up and push pressure on the line the fuel would just go back into the tank. So it was taking my car twice as long of a key cycle to start up. I replace the pump a while back and all has been good.
hmmm...I've had the same thing happeneing to me recently. I have to hold the key for about 3-4 seconds before it starts.

Rick
 
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Old Aug 21, 2007 | 03:56 PM
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Do you have a return kit with a gauge? If so see if it holds pressure when you turn the car off. When it is good the pressure should go down slowly, when mine was bad there was no pressure in the amount of time it takes me to reach in the window, shut off the car and look under the hood (~2 sec).
 
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Old Aug 21, 2007 | 03:59 PM
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Originally Posted by ttrank
Do you have a return kit with a gauge? If so see if it holds pressure when you turn the car off. When it is good the pressure should go down slowly, when mine was bad there was no pressure in the amount of time it takes me to reach in the window, shut off the car and look under the hood (~2 sec).
hmmm..no return system and no gauge. I haven't needed it because other issues where taking care of easily with tuning...I just sold it as a matter of fact.

Rick
 
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Old Aug 21, 2007 | 06:23 PM
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I would just replace the pump and see.
 
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Old Aug 21, 2007 | 06:34 PM
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Replacement goes in tomorrow
 
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Old Aug 22, 2007 | 10:34 AM
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Most oem quality pumps have a high pressure blowoff valve and a reversion valve to keep a turned off pump from spinning backwards and loosing pressure............unless injectors leak.
 
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Old Aug 22, 2007 | 10:38 AM
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Originally Posted by Q45tech
Most oem quality pumps have a high pressure blowoff valve and a reversion valve to keep a turned off pump from spinning backwards and loosing pressure............unless injectors leak.
Yep..that's what TTRANK already said as well...
 
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Old Aug 22, 2007 | 04:52 PM
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Originally Posted by ISMSOLUTIONS
Replacement goes in tomorrow

Hope it solves the problem.
 
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Old Aug 22, 2007 | 06:50 PM
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Originally Posted by ttrank
Hope it solves the problem.
OK - found the problem, JUST BEFORE we pulled the pump...it was the PCV valve...I probably cracked the neck when I did the oil catch can, hence a vacuum leak.

All better now...

Rick
 
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Old Aug 22, 2007 | 07:29 PM
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Sweet!

Glad you found the problem and saved having to pull the pump.

How did you find the PCV issue?
 
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