Rover 75 diesel not starting after HPFP replacement

JMW · 2nd April 2023, 15:30

. .

Mike Noc · 2nd April 2023, 16:15

Glowplug fault is a red herring - every one I've checked comes up with that. What are the fuel pressures, LP and HP?

Jamiewelch · 2nd April 2023, 18:31

Quote:

Originally Posted by JMW

So the error codes currently are:

Glow plug system
Boost pressure sensor
Rail pressure sensor

The low pressure when key at position 2 is 353 kPa, I can’t get reading for the rail pressure as engine not running. My ZTT is giving a reading of 355.

Regards

Jon

What rail pressure do you get while cranking? You shoudl be hitting 30,000kpa, if you don't it won't start.

Matt_75 · 2nd April 2023, 20:33

The HPFP has a check valve in the inlet. If it's a 2nd hand pump that's sat around for a while, it might be that the valve is stuck. This happened to me after my car sat for a number of months. Might be worth checking?

Undo the 3 bolts holding the power steering reservoir and move it to the side. Undo the hose clamp, access is tricky, I removed the engine cover and fed in a long flat bladed screwdriver from the right hand side (looking at the engine from the front of the car). Pull off the hose. Use a parallel pin punch or screwdriver to press on the ball in the inlet fitting. You should feel it moving back and forth with a spring behind it.

Matt_75 · 4th April 2023, 11:20

Here's the thread from when I had my non-starting problem, there might be useful info in there: https://www.the75andztclub.co.uk/for...d.php?t=320259

Have you tried a squirt of Easy Start (or similar) down the intercooler hose? If it starts and runs on this, that could be indicative of a fuel pressure regulator issue.

Jamiewelch · 4th April 2023, 15:01

Quote:

Originally Posted by JMW

I’m not sure how to measure the cranking pressure, PScan shows 0 for the rail pressure when cranking.

That could be your problem, you should be seeing upwards of 300 bar while cranking. I'd be checking all wiring to the rail and the pump. With 0 rail pressure it won't even attempt to start.

Arctic · 4th April 2023, 20:17

Quote:

Originally Posted by JMW

Thank you to everyone for the advice, in the end after a few cranks with easy start she fired up and ran happily up to temperature. Must have needed a little bit of help after sitting so long.

Im hoping all sorted in time for the new clutch at the weekend.

Regards

Jon

Jon nice one

Matt_75 · 4th April 2023, 21:41

Glad to hear you got her going

2nd April 2023, 15:30	#1
JMW Avid contributor MG ZTT CDTi MK2 Join Date: May 2014 Location: UK Posts: 208 Thanks: 61 Thanked 14 Times in 14 Posts	Rover 75 diesel not starting after HPFP replacement . . Last edited by JMW; 8th June 2024 at 21:41..

2nd April 2023, 20:33	#4
Matt_75 Gets stuck in 75 Saloon Join Date: Apr 2022 Location: North Somerset Posts: 600 Thanks: 13 Thanked 20 Times in 8 Posts	The HPFP has a check valve in the inlet. If it's a 2nd hand pump that's sat around for a while, it might be that the valve is stuck. This happened to me after my car sat for a number of months. Might be worth checking? Undo the 3 bolts holding the power steering reservoir and move it to the side. Undo the hose clamp, access is tricky, I removed the engine cover and fed in a long flat bladed screwdriver from the right hand side (looking at the engine from the front of the car). Pull off the hose. Use a parallel pin punch or screwdriver to press on the ball in the inlet fitting. You should feel it moving back and forth with a spring behind it. __________________ Matt 2001 Rover 75 Connoisseur SE 2.5 (BRG) 1999 Rover 75 Club 2.5 (Dorchester Red) 1973 Triumph Dolomite (Honeysuckle)

4th April 2023, 11:20	#5
Matt_75 Gets stuck in 75 Saloon Join Date: Apr 2022 Location: North Somerset Posts: 600 Thanks: 13 Thanked 20 Times in 8 Posts	Here's the thread from when I had my non-starting problem, there might be useful info in there: https://www.the75andztclub.co.uk/for...d.php?t=320259 Have you tried a squirt of Easy Start (or similar) down the intercooler hose? If it starts and runs on this, that could be indicative of a fuel pressure regulator issue. __________________ Matt 2001 Rover 75 Connoisseur SE 2.5 (BRG) 1999 Rover 75 Club 2.5 (Dorchester Red) 1973 Triumph Dolomite (Honeysuckle)

4th April 2023, 21:41	#8
Matt_75 Gets stuck in 75 Saloon Join Date: Apr 2022 Location: North Somerset Posts: 600 Thanks: 13 Thanked 20 Times in 8 Posts	Glad to hear you got her going __________________ Matt 2001 Rover 75 Connoisseur SE 2.5 (BRG) 1999 Rover 75 Club 2.5 (Dorchester Red) 1973 Triumph Dolomite (Honeysuckle)

2nd April 2023, 16:15	#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: 11,579 Thanks: 3,470 Thanked 3,119 Times in 2,247 Posts	Glowplug fault is a red herring - every one I've checked comes up with that. What are the fuel pressures, LP and HP?