Hi guys. I can shed some light on this. Have you ever noticed that you can hear GM truck pumps running while you stand beside it and the engine is running but you can't hear Chrysler pumps running? That's because they are built with tighter clearances. That makes them quiet but susceptible to locking up from debris in the tank.
The way the story typically plays out is you buy a cheap pump and it too locks up in a few months. After the second failure you switch to a higher quality pump from NAPA. It too locks up but it was real quiet. That's because NAPA buys their pumps from the same supplier that sells them to Chrysler. After the fourth or fifth failure you get frustrated and buy a pump from the Chrysler dealer and have no more problems.
The assumption is none of those pumps were any good but that would be wrong. What happens, according to a Chrysler trainer, is that microscopic debris in the tank collects in the pump and causes it to turn hard. Every new pump collects some more of that debris and suffers the same failure. By the time you get to the dealer's pump the debris is gone. Had you started with the dealer's pump it would have failed too.
The secret is to take the tank to a radiator shop and have it steam cleaned before installing the new pump. I don't remember where that debris comes from but this was a pretty common cause of repeat failures.
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Monday, February 28th, 2011 AT 7:46 AM