 Fuel Pump, Bad Pump???? |
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| retravis23 |
 Mar 14 2010, 02:54 PM
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#1
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Newbie  Group: Members Posts: 4 Joined: 13-March 10 From: texas Member No.: 11,459 Region Association: Southwest Region  |
Bosch pump with less than 5000 miles on it. Got power to the pump. Pump sticking. Sometimes can tap it and it starts, only to stop again. Am in process of cleaning fuel tank and putting new sock filter on outlet.
My question....does it make sense that this pump could be sticking because of debris getting through to it? Or do I likely just have a bad pump? Thanks in advance for responding. This forum is a life saver for a rookie like me. |
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| SirAndy |
Mar 14 2010, 02:58 PM
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#2
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Resident German Group: Admin Posts: 41,651 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
I'd check the electrical connections first.
Make sure the connector and the two cables are good and you get good ground. (IMG:style_emoticons/default/bye1.gif) Andy |
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| retravis23 |
Mar 14 2010, 03:18 PM
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#3
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Newbie Group: Members Posts: 4 Joined: 13-March 10 From: texas Member No.: 11,459 Region Association: Southwest Region |
QUOTE(SirAndy @ Mar 14 2010, 03:58 PM)  I'd check the electrical connections first. Make sure the connector and the two cables are good and you get good ground. (IMG:style_emoticons/default/bye1.gif) Andy Checked cables at the pump connection and got 12. Is that what you mean? Thanks! |
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| underthetire |
Mar 14 2010, 03:48 PM
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#4
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914 Guru Group: Members Posts: 5,062 Joined: 7-October 08 From: Brentwood Member No.: 9,623 Region Association: Northern California |
Seen that failure a lot on newer cars. Bang on the tank to limp it home. Sounds like a bad pump to me.
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| jsayre914 |
Mar 14 2010, 05:25 PM
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#5
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Speed Up !!! Group: Members Posts: 3,188 Joined: 10-February 08 From: Timonium MD 21093 Member No.: 8,696 Region Association: MidAtlantic Region |
i assume you have fuel injection... so the test i did was to temporary jump a wire from the coil to the pump and ground the other terminal. leave the injector connector plug going to the pump ziptied out of the way, take it for a spin. if it is no longer cutting out you have a electrical gremlin. if it still cuts out its a bad pump.
(IMG:style_emoticons/default/driving.gif) |
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| Cap'n Krusty |
Mar 14 2010, 08:22 PM
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#6
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Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
If the only thing you do to make the pump run is to tap on it, and everything else remains unchanged, my money's on a bad pump.
The Cap'n |
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| Katmanken |
Mar 15 2010, 10:11 AM
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#7
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You haven't seen me if anybody asks... Group: Members Posts: 4,738 Joined: 14-June 03 From: USA Member No.: 819 Region Association: Upper MidWest |
I second the Cap'n on the pump.
If there is a filter between the gas tank and pump, then you definitely have a bad pump. If there is no filter and you are flushing crap out of the tank, then you might have ingested crap into the pump. In that case, the pump may be damaged. |
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| Spoke |
Mar 15 2010, 10:56 AM
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#8
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Jerry Group: Members Posts: 6,983 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None 
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QUOTE(retravis23 @ Mar 14 2010, 03:54 PM) Sometimes can tap it and it starts, only to stop again. When you tap on it while it is powered and not running, can you sense that the pump is "trying" to run? That is you should feel some humming or vibration. If the pump is making absolutely no noise or vibration before the tap-tap-tap-then-it-starts, then it sounds like the motor has a dead spot and is shot. Typical dirt in the pump shouldn't be bad enough to cause a motor to not start. You will hear the humming or feel some vibration if the pump was trying to run but couldn't because of a bit of dirt. |
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