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2000 Volkswagen Beetle Fuel Pump knocks loudly

Tiny
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I would think the blue is return and the black pressure, but I don't know that is true. I doubt it would have started if they were reverse.
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Friday, October 23rd, 2009 AT 2:20 PM
Tiny
02MARC
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That's what the Dephi guy asked if I had switched the lines on installation. I told him the same thing that I don't see how it could run at all if I did. He just kept saying "anything is possible" that's not the asnswer I seek *S*
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Friday, October 23rd, 2009 AT 3:15 PM
Tiny
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Welcome to the world of professional auto repair. LOL.

There are times you shake your head because you just can't believe how Chaotic it can get. More often than not it comes down to your raw ability to troubleshoot. Even then you can get to a point of."I sure hope this is it"! LOl.

Will the parts store be willing to swap it out?

Seems to me that the symptom of making noise that continues to get worse parallels the pressure that would rise as the pump pumps but a partial restriction causes a slow increase in pressure until it reachs peak backpressure and a transfer of energy is causing a shaking that is causing the noise. Where the vibration is may be irrelevent but since it seems to be on the return side, I would make that the priority, but it can be anywhere in there.
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Friday, October 23rd, 2009 AT 6:38 PM
Tiny
02MARC
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Ok.I took out and reinstalled the pump for the 3rd time now. I blew out the return line and the gas came out clear. BUT.A change. It ran perfect for about 10 mins before I heard the rythmatic knocking come back and the engine then began to run rougher. The return line blew through without any prob. I felt the lines as it was knocking and the output line was still smooth and I felt all the vibration in the return line. I have a new filter ordered and will change that out when it gets here. I was so stoked because I thought we fixed it after it ran 10 mins. I am going to look at your schematic and see where else it may be. Now what?
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Sunday, October 25th, 2009 AT 2:55 PM
Tiny
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Ugggghhh.
Well at least the symptoms changed.
Why would the runibility change?
Going into open loop?
A second problem?

I sure wish I knew what was happening whith the fuel pressure when it runs poorly.

Gotta give this thought.
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Sunday, October 25th, 2009 AT 7:11 PM
Tiny
02MARC
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Man! The schematic you sent covering the fuel system shows the system to be friggin simple. There's not much to breakdown. Tomorrow my fuel pump should arrive. I would think the pump is defective if not for the fact my old pump started making the SAME sound before I pulled it into the garage to fix. I changed the filter about a month ago but am going to change it out. There's nothing left I can see to breakdown and cause the noise.
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Tuesday, October 27th, 2009 AT 3:29 PM
Tiny
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LOL.I mis-read, I thought you did replace it again. Whew.I might want this to be the fix more than you lol.

Yeah it is basic, but why on the return side is the vibration present?
Power is good to pump? Can you see me bracing for the chance the pump that is in there is good?

Picture being in front of a customer and telling them that chances are good that the pump is the problem, but you just can't gaurentee it.
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Tuesday, October 27th, 2009 AT 6:47 PM
Tiny
02MARC
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Ahhhhh! I am just so frustrated with this car. AND I'm sorry I'm getting my pumps and filters mixed up. I DID change out my old PUMP. The new one is installed and making the noise. I thought it was the pump because my old one started making the noise about 10 mins before I pulled it in the garage to change it out. I was trying to go up a hill to get home and the more gas I gave it. The slower and more stumbling it became. This new pump is making exactly the same noise. The FILTER I just ordered thinking. WHAT ELSE CAN BE WRONG! *S* and it arrives today. As far as I see in your diagram. There is nothing left. But obviously there HAS to be. (Now banging my head on my desk)
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Wednesday, October 28th, 2009 AT 9:37 AM
Tiny
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Anything different with the new filter?
Did you try to tap out the filter to see if any debris was in it?

I don't know that it is possible, but the filter you replaced the first time wasn't installed with the flow going in the wrong direction was it?

When you checked the return line, did you disconnect both ends to blow it out. Presence of fuel does not mean there isn't a restriction. A restriction can be partial.
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Friday, October 30th, 2009 AT 5:30 AM
Tiny
02MARC
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It is solved! I changed the fuel filter yesterday and I drove it to work today. No knocking! How do I send you a tip? You deserve it for sticking this thing out with me.
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Friday, October 30th, 2009 AT 12:02 PM
Tiny
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I'm really happy for you!

REALLY! LOL!

Wasn't sure where to go next. Damn VWs ;-)
I wonder if the old pump was really bad. :-0

If you want to leave some feedback, that would be appreciated.

Enjoy the week end.
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Friday, October 30th, 2009 AT 3:22 PM

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