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2003 hdi intermittent lift pump problem
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Cynthia

Posted: Mon Nov 12, 2018 7:32 pm

Joined: Nov 12, 2018
Posts: 3
Trade Rating: 0

Hello,
I'm having a very frustrating problem and I hope that you can help me. My Peugeot is a 2.0, and I've been dealing with this intermittent failure problem for three years, and my mechanic, who is a Peugeot specialist, can't find the source. Here is a breakdown:

1. At first, the car was fine. But from time to time, if I stopped on my way home to do an errand, it wouldn't start again. The lift pump in the back wouldn't come on. I would call a tow truck to take it to the garage, but it would always start again in the morning. After an episode, it would start and run normally for weeks, or months, and then would do it again.

2. The first evolution in the problem started last year. I would try to start the car first thing in the morning, but the pump wouldn't come on. By this point, my mechanic told me to try to disconnect the battery for a few minutes, reconnect, and try again. Sometimes this would work after one disconnect, sometimes after two or three. It could take anywhere from 5 to 45 minutes to get the car to start. It once started for me just after I'd called the truck - I turned the key to roll down the windows while I waited and the pump came on. As usual, after an episode it would run normally for several weeks or months.

3. The latest change is that now it can take 2 or 3 days for the car to decide to turn the pump on when it fails. Most recently is this past Saturday. I was out running errands, and on my last stop, it wouldn't start again. I spent an hour disconnecting/reconnecting the battery, bumping the starter, letting it rest, trying again, disconnecting the pump, etc... with no luck. I tried again today, with no luck. It's still parked at the supermarket where I left it on Saturday. I'll go back in the morning to try again.

Here are some things that we know:

1. It's not the pump. One of the last times I took it to the mechanic, they changed the pump to test the system, and it wouldn't work. We know that it's electrical.

2. All of the wires and contacts have been cleaned and checked.

3. This car doesn't have a relay to the pump.

4. It's linked to hot weather, anything over 10 degrees, but much worse in the summer.

5. My mechanic is very frustrated by the problem, and thinks that it's the ECU. But I've read that the lift pump is not controlled by the ECU.

6. This is not the original pump, so it's been changed at least once in the car's life.

Any help you could give me would be greatly appreciated. I know I should get rid of the car, but at the moment it's not an option. It's got to last me at least another year. Thanks so much.

Steve206

Posted: Tue Nov 13, 2018 7:30 pm

Joined: Feb 07, 2010
Posts: 2716
Trade Rating: +6
Location: UK

I had this problem on my 2.0 Hdi. Mine was caused by the fuse for the lift pump . The fuse is in the engine bay, you'll have to check which one. When i pulled the fuse it would be burnt, but the fuse not blown.

I had similar symptoms to you, i would sit there turning the ignition off and on until i heard the pump prime. Once it was running it was no problem, but could happen as soon as i shut the engine off and tried to restart.

In the end i swapped the whole fuse board and sold the car!


	Work in Progress

Cynthia

Posted: Wed Nov 14, 2018 9:38 am

Joined: Nov 12, 2018
Posts: 3
Trade Rating: 0

Thanks! The car is at the garage at the moment. Trying to start the car Monday and yesterday killed the battery. I'll ask him which fuse it is. Can't hurt at this point. Someone mentioned to me that it could be the BSI or the CAN, but I'll start with the fuse.

Cynthia

Posted: Thu Nov 15, 2018 9:56 am

Joined: Nov 12, 2018
Posts: 3
Trade Rating: 0

Got the car back last night. It turns out it was the starter that failed. Could this have been the cause of the pump problem all along?

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