Engine won't start immediately but needs cranking

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andrewfisher

New Member
Posts
9
Good afternoon all.

2003 Discovery 2 TD5 Auto (107K miles). Deisel from a reputable garage - no issues as always use the same garage. No obvious fuel leak on driveway.

6 weeks ago a garage removed the fuel tank to carry out some work, when replaced the 'green' line in the fuel pump leaked diesel. This was rectified.

Last wednesday parked up as normal on driveway. [No engine issues wha so ever]

Thursday afternoon went to start vehicle and stated the car as normal, 5 seconds later is stopped. Would not re-start, just cranked over. Fuel pump doing its normal 'whurring' noise (But quite loud) [Re fuel pump, replaced by an afermarket on in March 2023 (not my decision) and after a period of quiet running has become very noise]. The top of the fuel pump was inspected, no diesel but there was signs of wetness around the pump.

The very nice man from the AA attended and no faults on his diagostic device were found. He cranked the car for an exteneded period and after a splutter bust in to life, ticking over and revving as normal. Stopped and started as normal followed by a 5 mile drive - all very normal. He sugested that there might be an air leak in the fuel systemj which was allowing fuel in the low pressure side to feed back into the fuel tank.

Later on in the day (approx 3 hours later, same issue, would not start but just crank over - after an extended crank say 15 second ish, spluttered and burst into life.

Any thoughts please - many thanks
 
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Cheers - my summations as well. The fuel pump does do its whurring and stops - when I presume pressure has been gained, but I have little confidence, an air leak is also very plausible.

I'll investigate
 
Treat yourself to a cheap fuel pressure test kit off Ebay. Worth its weight in gold for diagnosing fuel issues. About £36 delivered. If you intend to keep your TD5, buy one.

s-l1600.jpg


Read my last thread... we were getting an intermittent 4bar of pressure, but leaking it off, it was all frothy. Fubared cheap fuel pump, that lasted about 6 months.
 
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Treat yourself to a cheap fuel pressure test kit off Ebay. Worth its weight in gold for diagnosing fuel issues. About £36 delivered. If you intend to keep your TD5, buy one.

View attachment 305317

Read my last thread... we were getting an intermittent 4bar of pressure, but leaking it off, it was all frothy. Fubared cheap fuel pump, that lasted about 6 months.
There is a kit specifically for Td5 available

1703112737971.png
 
Yeah, but that kit only does one specific engine, and is three times the price....
It is, but is has a proper gauge, all stainless fittings and built to last. If you need it for multiple vehicles then the cheap ones would be best, but they don't last and often not that accurate.
 
Cheers - havent bought yet, but considering. No updaqt eont he vehicle - poss nest week when I have a little more time - thanks for all the contributions - I'll update in time.
 
A proper replacement glycerin filled 100mm gauge is only about £20, which to be fair, I am going to do..... The hydraulic Holmbury ISO connections are £4 each, a few adaptors, and dowty sealing washers. I'd say £10 for the hydraulic hose and crimped connections. You could make your own TD5 testing kit for under £50.
 
A short list for the td5 from my own experience with a client.
The non return in the fuel filter housing.
A Duff fuel pump in the tank.
Glow plug wiring and plugs x4.
Fuel regulator and it's pipes on the rear of the head
The wiring loom from the injectors.(oil at the ecu plug).
The injector seals inside the head .
Once we updated this list on his 2003 td5 disco, it starts on the button and runs like a dream.😉
 
A quick check to rule out some issues, will cost a bit, but worth trying.

Does it start OK with a full tank?
 
@andrewfisher
Did you get to the bottom of this? My 04 Disco II TD5 just started doing something v similar. Will drive 5-6 miles, then if under load (hill) dies.
Purging air (5 throttle presses) then extended cranking it'll go again.
Have checked current draw for fuel pump - seems OK (22.5mV across F10)

The pump is a 2yo German built one (can't remember the make)

Any suggestions welcome
 
A short list for the td5 from my own experience with a client.
The non return in the fuel filter housing.
A Duff fuel pump in the tank.
Glow plug wiring and plugs x4.
Fuel regulator and it's pipes on the rear of the head
The wiring loom from the injectors.(oil at the ecu plug).
The injector seals inside the head .
Once we updated this list on his 2003 td5 disco, it starts on the button and runs like a dream.😉
Heres a definite list to go pn
Any one or all of are a definite cause of your symptoms 👍
 
Mine turned out to be in the fuel filter head.
Someone had installed the non-return valve and the air bleed valve in the wrong places.
Fixed that, cleaned everything, changed filter. Seems to be fine.

Will see how it starts tomorrow morning, but after everything reconnected, primed system and it started immediately with no throttle, then ran flawlessly for a 50km test drive.

BTW - why would you replace the filter head? All the drillings seem to be straight through with any valve gubbins being in the fittings.
 
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