Diesel fuel pump testing itp?

biffa75 · 6th November 2021, 10:28

Hi all,

As a separate thread from my recent clutch endeavours I'd like to confirm if my in tank fuel pump is working.

I've noticed since we got the car, turning on the ignition, the fuel pump under the bonnet primes and can be heard quite clearly inside the car as a loud humming noise. With the bonnet up, feeling the pump body you can feel it vibrating slightly. The priming lasts around 30 seconds before it stops.

I've tried opening the fuel filler and removing the filler cap and turning the ignition on and listening for a whine but its quite hard to tell if there's a faint whine coming from the filler due to the under bonnet pump.

Is there any other way to check the in tank pump is priming? Could I unplug the under bonnet pump using that small connector on top?

Thanks
Rob

Mike Noc · 6th November 2021, 21:48

Yep, unplug the UBP and listen again through the open filler pipe. If you can hear anything it has to be the ITP.

6th November 2021, 10:28	#1
biffa75 Trader Mk1 2004 tourer cdti + MK1 2003 Saloon CDT Join Date: Nov 2015 Location: west yorkshire Posts: 495 Thanks: 106 Thanked 91 Times in 57 Posts	Diesel fuel pump testing itp? Hi all, As a separate thread from my recent clutch endeavours I'd like to confirm if my in tank fuel pump is working. I've noticed since we got the car, turning on the ignition, the fuel pump under the bonnet primes and can be heard quite clearly inside the car as a loud humming noise. With the bonnet up, feeling the pump body you can feel it vibrating slightly. The priming lasts around 30 seconds before it stops. I've tried opening the fuel filler and removing the filler cap and turning the ignition on and listening for a whine but its quite hard to tell if there's a faint whine coming from the filler due to the under bonnet pump. Is there any other way to check the in tank pump is priming? Could I unplug the under bonnet pump using that small connector on top? Thanks Rob

6th November 2021, 21:48	#2
Mike Noc This is my second home Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4. Join Date: Jul 2009 Location: Hampshire Posts: 11,551 Thanks: 3,470 Thanked 3,119 Times in 2,247 Posts	Yep, unplug the UBP and listen again through the open filler pipe. If you can hear anything it has to be the ITP.