Cr4zyChris · Thursday at 12:35

Hi, my freelander 1 (05 hippo) has had fuel supply issues for at least a year. I've had the high pressure, low pressure, tank pump and injectors o/h / replaced.
I've bypassed the sedimenter as it was leaking through the o-ring and I wouldn't say we need it in the UK.

Once running I've got no issues, and it'll turn over first times as many times as I like. But when I leave it overnight to go cold or in the work carpark it loses prime or something.

It's still stuttering on start up and firing fuel out the exhaust. Sometimes I have to throttle it and it takes a few turns to go. It's definitely running a lot better than it was but turning over is a nightmare.

Any ideas?

saxavordian · Thursday at 12:50

Have you had any diagnosis reading to narrow it down. There's a few sensors that can hinder fuel flow as also to simple filters and air leaking on the injectors rail. Check first for fuel leak or air ingress sucking on the return line to the tank.

andyfreelandy · Thursday at 13:24

There is no tank pump on an 05. Just a LP in the wheel arch and the HP driven from the timing chain.

Check correct unit was installed in tank.

Freddie17 · Thursday at 13:41

Could well be on the LP pump side - if that is not feeding enough pressure to get your HP pump up and running in the morning… are you sure the pump was replaced and not just the filter?

Can you read live data? If so, get the pressure readings and post on here. From memory, you’re looking for ~350 KPA on the LP side. That can rule the fuel pressure in or out of the problem.

Freddie17 · Thursday at 16:11

Could also be the O ring on the regulator of the HP pump - these are known to fail. But you say you’ve had that replaced also, correct?

Cr4zyChris · Thursday at 16:48

Freddie17 said:
Could also be the O ring on the regulator of the HP pump - these are known to fail. But you say you’ve had that replaced also, correct?

Thanks for getting back to me, I haven't got the means of testing pressure but I'm willing to buy the equipment at this point. I have a more mechanically inclined friend who might have the kit I need. So thanks for the data.

I physically changed the lp pump myself assuming the same thing. But lo and behold it was correct and now I have a spare. That's when I realised my o-ring on the sedimenter were sucking in air. I've bypassed that now as I said. I'll get back in touch if I can test the pressure. I'm more confident that I'm losing pressure elsewhere, and yes the garage said they changed the hp pump. But I can only take them on their word as I haven't looked closely.

Cr4zyChris · Thursday at 16:48

andyfreelandy said:
There is no tank pump on an 05. Just a LP in the wheel arch and the HP driven from the timing chain.

Check correct unit was installed in tank.

Apologies, that's what I meant. I have checked myself that it was correct

Cr4zyChris · Thursday at 16:51

saxavordian said:
Have you had any diagnosis reading to narrow it down. There's a few sensors that can hinder fuel flow as also to simple filters and air leaking on the injectors rail. Check first for fuel leak or air ingress sucking on the return line to the tank.

I have a pal with a landrover reader (sorry I don't know the correct terminology), but he can't discern anything from the readings as it won't communicate to my car. He can't pull any codes that is. Whether my car had been modified in the past to hide them, I've had no engine light...

Cr4zyChris · Thursday at 16:52

saxavordian said:
Have you had any diagnosis reading to narrow it down. There's a few sensors that can hinder fuel flow as also to simple filters and air leaking on the injectors rail. Check first for fuel leak or air ingress sucking on the return line to the tank.

Sorry, but how would you test for air ingress? Pressure readings?

saxavordian · Thursday at 19:52

Cr4zyChris said:
Sorry, but how would you test for air ingress? Pressure readings?

Depends on the return pipe condition whether damaged or corroded or perish rubber. More a mechanic looking underneath at the state of condition while the engine running.

saxavordian · Thursday at 19:59

Cr4zyChris said:
I have a pal with a landrover reader (sorry I don't know the correct terminology), but he can't discern anything from the readings as it won't communicate to my car. He can't pull any codes that is. Whether my car had been modified in the past to hide them, I've had no engine light...

The diagnostic tool for Freelander model are in two types earlier model till 2002 later models onwards read fully were early read minimum. They can cost about £60+ for a proper reading at garage. The error codes can be cleared for the sensors or pointing to failing parts.

andyfreelandy · Thursday at 20:43

Just a thought, easy to do.

Unplug pressure sensor on the battery end of the fuel rail. Clean contacts on plug and socket and refit.

It maybe that it is high resistance and improves when used before getting cold and damp again.

I have had this before. Not always cold problem but worth go.

Freddie17 · 2024-08-09T06:38:54+0100

Cr4zyChris said:
Thanks for getting back to me, I haven't got the means of testing pressure but I'm willing to buy the equipment at this point. I have a more mechanically inclined friend who might have the kit I need. So thanks for the data.

I physically changed the lp pump myself assuming the same thing. But lo and behold it was correct and now I have a spare. That's when I realised my o-ring on the sedimenter were sucking in air. I've bypassed that now as I said. I'll get back in touch if I can test the pressure. I'm more confident that I'm losing pressure elsewhere, and yes the garage said they changed the hp pump. But I can only take them on their word as I haven't looked closely.

Did you change the fuel filter next to the lp pump while you were there?
I don’t think that’s your issue, but good preventative maintenance going forward.

Freddie17 · 2024-08-09T06:41:27+0100

Cr4zyChris said:
Thanks for getting back to me, I haven't got the means of testing pressure but I'm willing to buy the equipment at this point. I have a more mechanically inclined friend who might have the kit I need. So thanks for the data.

I physically changed the lp pump myself assuming the same thing. But lo and behold it was correct and now I have a spare. That's when I realised my o-ring on the sedimenter were sucking in air. I've bypassed that now as I said. I'll get back in touch if I can test the pressure. I'm more confident that I'm losing pressure elsewhere, and yes the garage said they changed the hp pump. But I can only take them on their word as I haven't looked closely.

You need someone with a diagnostic code reader that also has live data. One of the best (I think) is a Pscan, and if you plan on keeping your F1 and doing work on it, perhaps consider investing in something that can point the way in fault finding.

Not worth buying one if you don’t intend on keeping long, or diy.

There may be someone on the forum in your area that could hook it up and check the fuel pressure readings for you.

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