# GrandPrix Pontic 2001 **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [June 26, 2011, 1:40am UTC](https://community.cartalk.com/t/grandprix-pontic-2001/65718 "2011-06-26T01:40:42Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![teacher](https://avatars.discourse-cdn.com/v4/letter/t/c6cbf5/32.png) [@teacher](https://community.cartalk.com/u/teacher)\ **Post date:** [June 26, 2011, 1:40am UTC](https://community.cartalk.com/t/grandprix-pontic-2001/65718/1 "2011-06-26T01:40:42Z")
We have a grand prix and had the water pump replaced. Soon after this the fuel pump went out. We replaced it 2 more times within a few weeks. Bought another one and this time the car may have run a period of 4 to 5 months before it went out. We have found by banging on the gas tank, and by turning the car on while someone bangs on it, you can hear the pump come on and start the car. Well, once again this week we have had the pump changed and I was about to leave work and the car would not start. Banging on the tank allowed me to be able to start the car… What is going on with the pumps or what is making them go out…??? Ugh… ---
**Author:** ![chaissos](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/chaissos/32/2347_2.png) [@chaissos](https://community.cartalk.com/u/chaissos)\ **Post date:** [June 26, 2011, 2:12am UTC](https://community.cartalk.com/t/grandprix-pontic-2001/65718/2 "2011-06-26T02:12:38Z")
From the description (bang on the tank), I would guess you have a bad ground, and none of the pumps actually failed. ---
**Author:** ![teacher](https://avatars.discourse-cdn.com/v4/letter/t/c6cbf5/32.png) [@teacher](https://community.cartalk.com/u/teacher)\ **Post date:** [June 26, 2011, 2:25am UTC](https://community.cartalk.com/t/grandprix-pontic-2001/65718/3 "2011-06-26T02:25:21Z")
hmmm is this something the mechanic can see when changing the fuel pump… ---
**Author:** ![bing](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/bing/32/4619_2.png) [@bing](https://community.cartalk.com/u/bing)\ **Post date:** [June 26, 2011, 2:50am UTC](https://community.cartalk.com/t/grandprix-pontic-2001/65718/4 "2011-06-26T02:50:05Z")
I’ve had pump problems too. Seems to be a weak GM issue. Sometimes it was the pump and sometimes the connector. You need to change the wiring harness when the pump is replaced and make sure the connector is making good contact.