C70 Convertible Fuel Pump Replacement

BlueStag · Mar 26th, 2020, 10:58

Hi,

Many apologies for the length of this!

I have a 2005 T5 C70 Convertible (115,000 miles) that is fantastic except for the occasional non-starting problem. This first occurred last summer, drove to supermarket and it wouldn’t restart (I put it down to the heat - car is in South west France) eventually it restarted.

A week later it wouldn’t start at all, so phoned the mobile mechanic and when he arrived...it started! He said it was more likely the relay so, I bought both the relay and fuel pump because I wanted both changed. He fitted the relay but couldn’t get to the fuel pump because of limited access and said that the fuel tank needs to be dropped to change the pump. However, in his opinion the fuel pump was OK because it either works or it doesn’t.

So yesterday, after 1000 miles - (same supermarket) the car wouldn’t re-start, turn engine over, it fires up then cuts out, waited 15minutes and all was well!!

Question - Fuel pump change and is dropping the tank the only way to fit the pump?

Thanks Steve

Clan · Mar 26th, 2020, 11:01

Quote:

Originally Posted by BlueStag

Hi,

Many apologies for the length of this!

I have a 2005 T5 C70 Convertible (115,000 miles) that is fantastic except for the occasional non-starting problem. This first occurred last summer, drove to supermarket and it wouldn’t restart (I put it down to the heat - car is in South west France) eventually it restarted.

A week later it wouldn’t start at all, so phoned the mobile mechanic and when he arrived...it started! He said it was more likely the relay so, I bought both the relay and fuel pump because I wanted both changed. He fitted the relay but couldn’t get to the fuel pump because of limited access and said that the fuel tank needs to be dropped to change the pump. However, in his opinion the fuel pump was OK because it either works or it doesn’t.

So yesterday, after 1000 miles - (same supermarket) the car wouldn’t re-start, turn engine over, it fires up then cuts out, waited 15minutes and all was well!!

Question - Fuel pump change and is dropping the tank the only way to fit the pump?

Thanks Steve

yes as there is no access hole in the floor of the car ... empty the tank first though it makes the job much easier !

Baffler · Mar 26th, 2020, 14:38

Quote:

Originally Posted by BlueStag

it fires up then cuts out

Before you disturb the the fuel tank try cleaning the connection of the immobiliser antenna ring (located around the ignition switch) with some contact cleaner.

Clan · Mar 26th, 2020, 14:51

Quote:

Originally Posted by Baffler

Before you disturb the the fuel tank try cleaning the connection of the immobiliser antenna ring (located around the ignition switch) with some contact cleaner.

i'm assuming it is the new steel roof C70 ?? we need to confirm that first of course . that was just around in 2005

BlueStag · Mar 26th, 2020, 16:31

Hi, it’s the Mk1, just the rag-top

SteveSarre · Mar 26th, 2020, 19:31

Hi BlueStag

As Baffler says, you shouldn't just assume that it is the pump.

If the pump buzzes for a few seconds when you turn the ignition on (you may have to get someone to listen under the boot), then the pump and relay may be fine. It turns itself off when the necessary pressure is reached.

If the car runs fine when it has started, that would also tend to indicate that the pump can keep up with demand, (and that the relay is fine).

If the immobiliser system is not satisfied that a correct key is in the ignition, the pump will run etc as normal, but the engine will be shut off after just a second or two. ie the engine will fire up as normal but then quickly shut off.
The chip in the key is detected by an antenna ring (which sits around where the key goes into the steering lock). If you have a second key you should try that to see if that helps, but the antenna ring is more likely.

I think a code reader would tell a mechanic what is going on.

HTH
Steve

Clan · Mar 26th, 2020, 22:14

Quote:

Originally Posted by BlueStag

Hi, it’s the Mk1, just the rag-top

pretty easy to lift out in the boot, towards the right hand side not far from the rear seat backrest .

BlueStag · Jun 25th, 2020, 19:05

Update on solving starting issues.

Camshaft sensor was faulty, car is now running (and starting) like a dream.

Also changed the fuel pump and crankshaft sensor to prevent any other issues.

Just have to sort the roof electrics which leaves 15mm gap when it retracts.

Mar 26th, 2020, 10:58	#1
BlueStag New Member Last Online: Jun 22nd, 2021 14:52 Join Date: May 2019 Location: Varaignes	C70 Convertible Fuel Pump Replacement Hi, Many apologies for the length of this! I have a 2005 T5 C70 Convertible (115,000 miles) that is fantastic except for the occasional non-starting problem. This first occurred last summer, drove to supermarket and it wouldn’t restart (I put it down to the heat - car is in South west France) eventually it restarted. A week later it wouldn’t start at all, so phoned the mobile mechanic and when he arrived...it started! He said it was more likely the relay so, I bought both the relay and fuel pump because I wanted both changed. He fitted the relay but couldn’t get to the fuel pump because of limited access and said that the fuel tank needs to be dropped to change the pump. However, in his opinion the fuel pump was OK because it either works or it doesn’t. So yesterday, after 1000 miles - (same supermarket) the car wouldn’t re-start, turn engine over, it fires up then cuts out, waited 15minutes and all was well!! Question - Fuel pump change and is dropping the tank the only way to fit the pump? Thanks Steve

Mar 26th, 2020, 19:31	#6
SteveSarre Premier Member Last Online: Apr 17th, 2024 17:43 Join Date: Oct 2004 Location: London/West Country	Hi BlueStag As Baffler says, you shouldn't just assume that it is the pump. If the pump buzzes for a few seconds when you turn the ignition on (you may have to get someone to listen under the boot), then the pump and relay may be fine. It turns itself off when the necessary pressure is reached. If the car runs fine when it has started, that would also tend to indicate that the pump can keep up with demand, (and that the relay is fine). If the immobiliser system is not satisfied that a correct key is in the ignition, the pump will run etc as normal, but the engine will be shut off after just a second or two. ie the engine will fire up as normal but then quickly shut off. The chip in the key is detected by an antenna ring (which sits around where the key goes into the steering lock). If you have a second key you should try that to see if that helps, but the antenna ring is more likely. I think a code reader would tell a mechanic what is going on. HTH Steve __________________ V70 2.5 Turbo AWD Man. 1999 Red V70 2.5 10V Auto 1998 Green C70 T 20V Auto Conv. 2001 Blue, C70 T5 Auto Conv. 2000 Blue V70 2.5 Turbo AWD Auto 1998 Green, V70 2.5 10V Auto BiFuel 1999 Red (scrapped) V70 20v Auto 1999 Green (scrapped)

Mar 26th, 2020, 16:31	#5
BlueStag New Member Last Online: Jun 22nd, 2021 14:52 Join Date: May 2019 Location: Varaignes	Hi, it’s the Mk1, just the rag-top

Jun 25th, 2020, 19:05	#8
BlueStag New Member Last Online: Jun 22nd, 2021 14:52 Join Date: May 2019 Location: Varaignes	Update on solving starting issues. Camshaft sensor was faulty, car is now running (and starting) like a dream. Also changed the fuel pump and crankshaft sensor to prevent any other issues. Just have to sort the roof electrics which leaves 15mm gap when it retracts.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)