fuel pump circuit problem

[barry needle]

My 2004 2.4 petrol vehicle keeps blowing the 15 amp fuse on the fuel pump circuit when starting. Has anyone any experience of this?

[Rojie]

2 hours ago, barry needle said:

My 2004 2.4 petrol vehicle keeps blowing the 15 amp fuse on the fuel pump circuit when starting. Has anyone any experience of this?

 

Hello Barry,

 

Welcome to the Forum.

[Geralt]

5 hours ago, barry needle said:

My 2004 2.4 petrol vehicle keeps blowing the 15 amp fuse on the fuel pump circuit when starting. Has anyone any experience of this?

The EFI fuse supplies all of the engine control components not just the fuel pump so you might have to check the current draw on the following suspects:

• Fuel Pump motor
• Evaporator solenoid
• Idle Speed Control Valve
• Oxygen Sensor heater

The ECU and MAF are unlikely to be the cause.

 

You could feasibly disconnect the oxygen sensor and evaporator and still run the engine. If the fuse doesn't blow then it could point to either of those being the culprit.

 

 

[barry needle]

19 hours ago, Geralt said:

The EFI fuse supplies all of the engine control components not just the fuel pump so you might have to check the current draw on the following suspects:

• Fuel Pump motor
• Evaporator solenoid
• Idle Speed Control Valve
• Oxygen Sensor heater

The ECU and MAF are unlikely to be the cause.

 

You could feasibly disconnect the oxygen sensor and evaporator and still run the engine. If the fuse doesn't blow then it could point to either of those being the culprit.

 

 

Thanks for that Geralt. I will progressively check them out.

[Geralt]

Can you let us know when the fuse blows? Is it during cranking, after cranking, randomly, etc.? It may help pin down the cause.

[barry needle]

Hi Geralt. In June this year, the engine turned over but would not start. After finding and replacing the blown 15 amp fuse, I had no more problems till I was on holiday in Scotland in September when the vehicle failed to start one morning and the 15 amp fuse had blown as did a spare I had. The breakdown man tried putting a 20 amp fuse in and it started and ran ok. I came back home and ran till early this month. On starting one morning the 20 amp fuse blew and the Alphard is now stuck on my drive. I have taken the combined filter and pump out to be tested. Due to it been an imported vehicle I have not found anyone who has a plug in diagnostic to find the fault code. 

Thank you for interest and help.

Barry

[Rojie]

14 hours ago, barry needle said:

Hi Geralt. In June this year, the engine turned over but would not start. After finding and replacing the blown 15 amp fuse, I had no more problems till I was on holiday in Scotland in September when the vehicle failed to start one morning and the 15 amp fuse had blown as did a spare I had. The breakdown man tried putting a 20 amp fuse in and it started and ran ok. I came back home and ran till early this month. On starting one morning the 20 amp fuse blew and the Alphard is now stuck on my drive. I have taken the combined filter and pump out to be tested. Due to it been an imported vehicle I have not found anyone who has a plug in diagnostic to find the fault code. 

Thank you for interest and help.

Barry

 

Techstream is the go to product for OBD work, but ...

 

I don't think it s operable on the very early Gen 1 vehicles

[Geralt]

Techstream does work on my 2003 model through K-Line although only engine, ABS and immobizer ECUs are capable of doing so. Even then I suffer intermittent comms problems.

 

It's possible that it has stored some codes which may point to the problem but I doubt it because the DTCs are usually committed to EEPROM at ignition off. If the EFI fuse has blown, switching off ignition will cut all power to the microcontroller and prevent the code being stored.

[Geralt]

21 hours ago, barry needle said:

Hi Geralt. In June this year, the engine turned over but would not start. After finding and replacing the blown 15 amp fuse, I had no more problems till I was on holiday in Scotland in September when the vehicle failed to start one morning and the 15 amp fuse had blown as did a spare I had. The breakdown man tried putting a 20 amp fuse in and it started and ran ok. I came back home and ran till early this month. On starting one morning the 20 amp fuse blew and the Alphard is now stuck on my drive. I have taken the combined filter and pump out to be tested. Due to it been an imported vehicle I have not found anyone who has a plug in diagnostic to find the fault code. 

Thank you for interest and help.

Barry

Hmm. If it's random and intermittent, then disconnecting components temporarily is unlikely to find the cause. You could be right about the fuel pump. It seems the fuse is blowing when you turn on ignition which is when the fuel pump runs initially. I doubt it is blowing when you turn ignition off. It certainly isn't blowing while you are driving otherwise the engine would stop.

 

BTW, the Ancel JP700 will read OBD codes as it does on mine. You might as well get it for future problems even if it hasn't stored any DTCs this time around.