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Old 03-23-2010, 01:22 PM
jonathangoff jonathangoff is offline
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Exclamation Why is fuel pump going bad

My question is what would cause my fuel pump to continually go bad? I have had two new pumps in my car in the last two weeks.

I came out to start my car one evening after work and it would not start. It had a powerful crank but would not start. My regular Honda mechanic was out of town, so I took it to another local shop and they said my fuel pump had gone bad. They replaced it with a $130 pump. Then several days later, my car stalled while I was driving on the interstate, it started back up then, but would not start the next morning. I took it into my regular Honda mechanic and he was looking it over when the car died on him. I had it towed back to first shop and they told me the fuel pump had gone bad. They replaced it with a $230 fuel pump. When I picked it up, the mechanic told me the car was still sputtering/dieing when braking and he wasn't sure why and if it broke down again, he would trouble shoot it more...after it died and I had to tow it back again.

I got it out of the shop and took it to my Honda mechanic so that he could check the car out more thoroughly. He checked everything and replaced many parts. It died again on him yesterday during the test drive. He continued to look at it and narrowed it down to the fuel pump AGAIN. I am going to have it towed back to the first shop so because it is still under warranty but once they put in the new pump, I am trying to figure out what to do next.

My question is what would cause my fuel pump to continually go bad? I have had two new pumps in my car in the last two weeks.

Thanks in advance for any advise you can offer.
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Old 03-23-2010, 03:09 PM
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Fredsvt Fredsvt is offline
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What year/model/engine?

Who's fuel pumps are these shops using?
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Old 03-23-2010, 03:15 PM
jonathangoff jonathangoff is offline
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oops...forgot that important info....'91 Accord LX, 4 door.

I'll have to find out what brand of fuel pumps were used and post it later.
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Old 03-23-2010, 04:05 PM
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Fredsvt Fredsvt is offline
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It's not common for the fuel pumps to go bad.

How old is the fuel filter, and has proper supply voltage and ground been verified. If the pump doesn't receive proper voltage or good ground, it will die a quick death.
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Silverstone 2003 Honda S2000, bone stock
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Old 03-23-2010, 04:10 PM
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Find out who's putting sand in your tank.
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Old 03-23-2010, 04:40 PM
Drew03Accord Drew03Accord is offline
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Quote:
Originally Posted by Fredsvt View Post
It's not common for the fuel pumps to go bad.

How old is the fuel filter, and has proper supply voltage and ground been verified. If the pump doesn't receive proper voltage or good ground, it will die a quick death.
I agree with Fred. It might be a clogged filter... also, it might be the fuel pump control module that's bad. In many cars, when they fail, they wreck the fuel pump if use is continued.
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Old 03-23-2010, 04:47 PM
jonathangoff jonathangoff is offline
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The first filter that died was the original filter from '91. The first one might have been an Airtex but the second one was a Denso.

That is the same thing my regular Honda mechanic said. And I told him I wish he had not have been sick the week my car was dead. The problem still exists...and maybe the original pump did go bad, and whatever caused it has made the 2 new ones die also. I'll have to ask about the voltage.

Is it worth me spending another $160 to get the genuine Honda pump? Or do you think it is something else that is possibly killing my pimp and would do the same thing to a Honda pump?
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Old 03-23-2010, 04:51 PM
jonathangoff jonathangoff is offline
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The filter was replaced 2 weeks ago.
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Old 03-23-2010, 05:01 PM
Drew03Accord Drew03Accord is offline
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Quote:
Originally Posted by jonathangoff View Post
The first filter that died was the original filter from '91. The first one might have been an Airtex but the second one was a Denso.

That is the same thing my regular Honda mechanic said. And I told him I wish he had not have been sick the week my car was dead. The problem still exists...and maybe the original pump did go bad, and whatever caused it has made the 2 new ones die also. I'll have to ask about the voltage.

Is it worth me spending another $160 to get the genuine Honda pump? Or do you think it is something else that is possibly killing my pimp and would do the same thing to a Honda pump?
I would not get another pump without having the control module checked, else you might be repeating the same mistake.
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Old 03-23-2010, 05:16 PM
Skidmarcx Skidmarcx is offline
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Did they happen to check the pressure after replacement? Excess pressure will cause a failure. .. bad regulator?
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Old 03-23-2010, 05:17 PM
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There is no control module, only the main relay.

He needs to know if the wiring or relay contacts to the pump is able to handle the amperage draw of the pump itself, if it isn't, the pump will run too slowly from under voltage and overheat. These pumps don't like to run on low voltage.

What does the inside of the tank look like? Has the guy been replacing the "sock" pickup filter when he changes the pump?

He should also be checking the wiring that goes into the tank unit, to ensure nothing is burned or corroded causing voltage drop.

Skidmarcx made a good point, what is operating pressure on this system? If it's too low, it could point to a bad regulator, low voltage to the pump or restricted filter. If however it's got excessive pressure, either the regulator is bad, the return line(s) are collapsed. The excessive pressure is like "dead heading" the pump, which will also kill it.
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Old 03-23-2010, 06:14 PM
jonathangoff jonathangoff is offline
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I know that the pressure was between 25-30 after the new pump was installed. The pressure is good while driving until begin applying the brakes, then the pressure drops and the car dies. After the new pump was installed, the car still sputtered while stopping and was sluggish in starting and then after driving it for 1-2 days, it would not even start back up, unless I sprayed gas into the carburettor.
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Old 03-23-2010, 06:20 PM
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The fuel pressure is too low, should be 30 for a low, preferably 34-38.

you need to look into that tank and see if there are any baffles that are loose.

Either that or the fuel pump isn't mounted on it's unit properly.
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Vermilion 1999 SVT F150 Lightning, Sylvania/Visteon Xenarc HID headlamps, '01 L turn/marker lamps, PIAA fogs, '01 up Bilstein shocks, all Pioneer speakers, Clarion subwoofer. All Redline fluids.

Silverstone 2003 Honda S2000, bone stock
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Old 03-23-2010, 06:22 PM
Skidmarcx Skidmarcx is offline
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Sounds like something that low voltage will cause. Double check your battery condition, connections, and alternator. Bad diodes in an alternator will cause excessive ripple resulting in problems.
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Old 03-23-2010, 06:24 PM
Skidmarcx Skidmarcx is offline
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Quote:
Originally Posted by Fredsvt View Post
The fuel pressure is too low, should be 30 for a low, preferably 34-38.

you need to look into that tank and see if there are any baffles that are loose.

Either that or the fuel pump isn't mounted on it's unit properly.
Good point anything is possible. .. pump starvation will do it.
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