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slyder Samba Member
Joined: October 24, 2006 Posts: 23 Location: Ontario, Canada
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Posted: Thu Sep 06, 2007 12:51 pm Post subject: Fuel Pump is very noisy??? |
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My fuel pump is very noisy what can i do to fix it, other than replacing it? _________________ '97 Jetta Trek
Looking for Pre-70 Convertible
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ProvoCyclist Samba Member
Joined: December 07, 2004 Posts: 593 Location: Murray, Utah
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Posted: Thu Sep 06, 2007 2:05 pm Post subject: |
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I'll bite on this one. Use the search.
Replace your fuel filter. _________________ Clark
Current: 1986 Tintop GL 2wd, stock 2.1L, manual trans, Flash Silver LP7Y.
Past: 1985 Sunroof GL, 2wd, Subaru 3.3L, manual trans, resprayed to Diamond Silver L97A |
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tencentlife Samba Member
Joined: May 02, 2006 Posts: 10067 Location: Abiquiu, NM, USA
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Posted: Thu Sep 06, 2007 2:48 pm Post subject: |
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Change the filter(s) first. If there is a filter between the tank and the pump (on the suction side), usually a squared plastic job, that can get clogged easily and it will make the pump cavitate and get pretty noisy. That filter was discontinued by VW. The pressure side filter is a large metal canister and although they have very high capacity to trap stuff, they can also get clogged and make the pump strain, which will also make it noisy. You may have only one filter, and if you have only one make sure it is the metal canister downstream. The suction side filter is optional but the downstream one is not, if you want you injectors to work properly and not die prematurely.
If new filters don't improve the noise level then the pump may be on its way out. You can test that full battery voltage is reaching the pump and some other stuff, but when the day comes the pump is done, and its time for a new one. There are alternative replacements to the expensive genuine Bosch pump, like a Ford F150 pump I believe is supposed to be an exact fit. BusDepot offers a couple different pricelines as I remember. |
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slyder Samba Member
Joined: October 24, 2006 Posts: 23 Location: Ontario, Canada
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Posted: Thu Sep 06, 2007 2:57 pm Post subject: |
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I have already changed the filter and there was a lot of crap that came out of it when i took it off. If anyone has the Ford Part no. I would like it, otherwise I will do a search for it. _________________ '97 Jetta Trek
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singlewc Samba Member
Joined: September 02, 2005 Posts: 370
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Posted: Thu Sep 06, 2007 5:02 pm Post subject: |
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slyder wrote: |
I have already changed the filter and there was a lot of crap that came out of it when i took it off. If anyone has the Ford Part no. I would like it, otherwise I will do a search for it. |
If you have to get a new pump, so be it, but before you do, run the noisy pump backwards for five seconds or so. Reverse the polarity on the power connectors, and let it spit any internal crap into a bucket. Worked for me, on several occasions.
Watch out for sparks, and all the usual precautions around gasoline.
Caveat emptor, of course.
John |
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slyder Samba Member
Joined: October 24, 2006 Posts: 23 Location: Ontario, Canada
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Posted: Thu Sep 06, 2007 5:47 pm Post subject: |
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Thanks for the info. I will give that a try. _________________ '97 Jetta Trek
Looking for Pre-70 Convertible
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BFLOBUS Samba Member
Joined: March 04, 2007 Posts: 45 Location: Buffalo,NY
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Posted: Thu Sep 06, 2007 7:02 pm Post subject: |
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That happened to me 3X.. Rusty fuel tank |
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Bambus Samba Member
Joined: April 29, 2007 Posts: 104
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Posted: Thu Sep 06, 2007 8:13 pm Post subject: |
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tencentlife wrote: |
You can test that full battery voltage is reaching the pump and some other stuff |
One of the useful 'other' things 10-cent's ref-ing is an output volume test. See manuals for runtime vs output quantity. This tsting can be done on the bench or in place on the van. Useful for getting a baseline idea of impending drama, noise or no. FIRE HAZARD, either way. Be smart, get a dry-chem extinguisher at hand
In my own years of 2 Vanagon/motorcycle/car experience, the Bosch pump is a hearty, long-lived beast. My 2 vanagons each went thru severe trashy-tank/noisy pump periods over the years, and lived to tell about it. I developed an ear for the pump's racket-level, and would throw in new plastic filters at a moment's notice when i heard it. I've now added the big cannister per $.10's evangelizing, but still run the plastic box pre-filter to mainly protect the pump (its intended purpose). Spares of each of these carried *in the vehicle* is just smart.
Make no mistake: a thorough tank cleaning and seal job is required for longevity of filters, pumps, and injectors. Throwing new filters and pumps on a shitty fuel supply is uber-false economy.
On the '85 this summer i discovered one of the topside grommets on the plastic vapor expansion tanks (the white plastic tanks in the wheel wells) was completely gone-- this was allowing huge ammnts of dirt road sediment and H20 to get inside the tank.
Best,
MRP |
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singlewc Samba Member
Joined: September 02, 2005 Posts: 370
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brownbetty Samba Member
Joined: October 21, 2004 Posts: 78
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Posted: Fri Sep 07, 2007 12:17 pm Post subject: |
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Do you guys recommend the metal can fuel filter for all Vanagons? _________________ 1984 Vanagon Gl Wolfsburg camper
Look out! He's got a towel!! |
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msinabottle Samba Member
Joined: September 20, 2005 Posts: 3492 Location: Denver Area, Colorado
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Posted: Fri Sep 07, 2007 2:22 pm Post subject: I put a Can in the Line |
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After tencentlife gave his opinion on the matter, I bought a factory spec 'post pump' can filter, and installed it. You can learn from my experiences at:
http://www.thesamba.com/vw/forum/viewtopic.php?t=239516
No regrets.
Best! _________________ 'Winston,' '84 1.9 WBX Westy
Vanagon Poet Laureate: "I have suffered in
many ways, but never, never, never in silence." |
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slyder Samba Member
Joined: October 24, 2006 Posts: 23 Location: Ontario, Canada
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Posted: Tue Sep 11, 2007 12:46 pm Post subject: |
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Well I took the pump off and found part of my problem. The suction end was full of crap that was picked up from the tank. I think I am going to put a pre-filter on as a precaution. However this now makes me wonder what else is left in the tank.
If the suction was blocked with dirt and almost plugged how much do you think this would effect my fuel economy. I am using about 25-30 litres of fuel for about 100kms which I assume is really bad, I would expect it to be more like 10-15 Litres for 100kms. It is also no good that my fuel gauge doesn't work properly, I think the float is gone, so I have to really track my mileage.
Thanks for the suggestions and help. _________________ '97 Jetta Trek
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bucko Samba Member
Joined: December 09, 2004 Posts: 2617 Location: Coppell, Texas
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Posted: Tue Sep 11, 2007 1:41 pm Post subject: |
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You may want to drop the tank and clean it. You'll have to do this to replace the fuel sending unit anyhow (assuming it's bad). TENCENTLIFE just did a writeup in another thread on how to test your fuel gauge BEFORE dropping the tank to get at the sender. It was a day or so ago I think. Do a search.
You may also have dirty, clogged injectors, the cause for your poor mileage.
You already know what caused the dirty, clogged injectors. _________________ Current VW drives: 1984 Westfalia
Past VW drives: 1967 Beetle, 1973 Beetle, 1977 Bus, 1971 Military Type 181 |
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tencentlife Samba Member
Joined: May 02, 2006 Posts: 10067 Location: Abiquiu, NM, USA
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Posted: Tue Sep 11, 2007 5:52 pm Post subject: |
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Poor fuel flow isn't going to affect your fuel mileage except to make it go up, as long as you can stand the crappy running at cruising rpms. If the pump can't deliver the volume it should, the engine will show it at first by its inability to make normal power (power? What's that?) under load and in the higher rpm range. At lower rates, the flow of fuel is adequate and running may be pretty normal.
Remember, the pump runs at a constant speed and delivers a constant volume to the injector loop. It's the regulator that decides how much stays, and how much is sent back to the tank, as a reflection of how much the ECU is squirting into the engine. When flow is reduced at a constant rate (in the case of a constant, not intermittent, blockage), the first time it would show up is when the engine needs to use a greater volume than is being delivered. Otherwise, enough fuel is going by so pressure is being maintained and the injectors get fed what they need.
When the pump begins cavitating, though, flow can be full of gas bubbles and you'll feel the results of bad injection patterns pretty quick. The noise the pump makes is often the sounds of cavitation (an induced pressure so low that the fluid being pumped evaporates to form bubbles in the lowest-pressure zones of the pumps guts). |
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UH60Driver Samba Member
Joined: August 02, 2007 Posts: 51 Location: Clarksville,Tn
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Posted: Wed Sep 12, 2007 3:55 am Post subject: |
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Dude,
Had your exact same problem last month. Gas tank was shot. My mechanic re did my tank. Now fuel pump purrs. Before I faced the fact that my van had to go in to get the tank redone, I was changing fuel filters at every fill up. It sucked. Get your tank fixed and drive happy. |
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slyder Samba Member
Joined: October 24, 2006 Posts: 23 Location: Ontario, Canada
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Posted: Wed Sep 12, 2007 5:01 am Post subject: |
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what exactly did your mechanic do to the tank that can't be done on your own? _________________ '97 Jetta Trek
Looking for Pre-70 Convertible
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