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PostPosted: Tue Nov 07, 2017 7:24 pm 
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Sorry, yep, me rushing this morning before work, didn't notice the little valve behind the black cap. Just tested now, definitely petrol coming through when the engine is cranked over.


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PostPosted: Tue Nov 07, 2017 8:46 pm 
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It should squirt out under about 3 bar pressure when the engine is being cranked if you press the valve in, not just dribbling...?

Also, have your tried it 'up the nozzle' yet - put a decent squirt of 'Easy Start' into the manifold just before cranking? It should fire and run for a second or so if the ignition system is working in petrol mode. If the ignition system isn't working in petrol mode (but is in LPG mode) it would be another clue.

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PostPosted: Tue Nov 07, 2017 9:02 pm 
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LPGC wrote:
It should squirt out under about 3 bar pressure when the engine is being cranked if you press the valve in, not just dribbling...?


Hmm, didn't seem like that much was coming out, just dribbled about a 1cm into a small jar, over about 10-20 secs of cranking. Certainly didn't squirt out fast. I'll double check again in morning when it's light, in case I wasn't pressing valve in enough.

Still need to pick up a can of Easy Start, and give that a shot.


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PostPosted: Thu Nov 09, 2017 12:51 am 
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Arfa wrote:
LPGC wrote:
It should squirt out under about 3 bar pressure when the engine is being cranked if you press the valve in, not just dribbling...?


Hmm, didn't seem like that much was coming out, just dribbled about a 1cm into a small jar, over about 10-20 secs of cranking. Certainly didn't squirt out fast. I'll double check again in morning when it's light, in case I wasn't pressing valve in enough.

Still need to pick up a can of Easy Start, and give that a shot.


I'd get yourself a fuel filter while your there buying the easy start - it should squirt out. Given theres some pressure there the pump may be ok, but a seriously blocked filter won't help any.

If you do the same test with the inlet to the filter disconnected you should see if your getting a decent flow through to that point.


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PostPosted: Thu Nov 09, 2017 12:00 pm 
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Don't forget to take precautions - petrol squirting under pressure can be dangerous, wouldn't want to have it squirt on the car or especially a person and then some random spark light the petrol... Disclaimer bit! :lol: But seriously do be careful because petrol may come out like spray from an aerosol.

If you try again you may see the squirt, if there's no squirt at any point I'd still expect a pump problem over a filter problem tbh on the basis that if the filter was the problem we'd still usually expect a bit of a squirt at first unless the filter was nearly totally blocked. Besides the pump and filter there's also the petrol pressure regulator, there'd be far less pressure if that were stuck open (broken) but a failed pressure reg isn't likely.

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PostPosted: Thu Nov 09, 2017 12:11 pm 
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Tried again, reckon I wasn't pressing valve enough last time (was dark). Didn't come out like an aerosol, but a reasonable torrent came out, more at first then died down a little but still continued. Filled a small jar within 5-6 seconds ish. Difficult to judge if that was enough / normal. FWIW, whilst doing this test the engine did initially turn over for a moment on petrol, but didn't catch, then just cranked continuously - but this could be down to me bleeding the fuel off.

Next, I'd like to jump the fuel pump relay to see if the pump does indeed pump consistently.


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PostPosted: Thu Nov 09, 2017 6:09 pm 
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Sounds like a plan. Given what you've said about coming out faster at first also lends more weight to what Bri said about could be blogged filter.

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PostPosted: Mon Nov 20, 2017 1:29 pm 
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Quick update:-
Took car to local (non-lpg) garage last week. They cleaned/refitted throttle body down, check plugs, checked fuel pressure and ran diagnostics (just old O2 sensor errors). But couldn't confirm what was at fault. They gave and suggest an lpg specialist rather than swap random parts on a hunch. TBF they only changed 1hr labour.
Taking car to LPG specialist tomorrow, see what they reckon.
Car is really difficult to start in cold weather, when temp dropped to 3C last week, couldn't get it started until noon when weather had warmed up to 8-9C ish!

Other stuff we tried/checked:
Easy Start in air intake made zero difference.
MAF sensor - seems this X16XEL engine doesn't have one! just temp sensor on air intake (disconnecting this made no difference)
Wanted to siphon some fuel out to check its not by running motorbike on it, but 1m hose with kit didn't reach any fuel in tank! Normal? I'm not 100% certain of proximity of fuel tank to filler cap TBH. Yes, definitely fuel in tank, gauge says half full, and petrol does come out of fuel rail bleed valve (dodgy fuel sender and empty tank did cross my mind!).

Not had chance to check much else myself due to crappy weather outside (I've no garage) and lack of time. Hence sending to garages.


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PostPosted: Mon Nov 20, 2017 4:47 pm 
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Your wasting your time trying to siphon via the filler tube. They are designed to make that difficult if not impossible. It's More reliable to pop off one of the hoses and use that to empty, you just need to make the pump run.

Doesn't sound like filter is blocked though so at least you've ruled some stuff out there.


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PostPosted: Tue Nov 21, 2017 6:36 pm 
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Just heard back from Big LPG in Barking - they found a leak on fuel hose within tank coming from fuel pump, seems that fuel was pumped, but leaking back into tank and thus not providing enough pressure to fuel rail. Not too expensive to fix in end either at £120. Much happier now, will pick up car tomorrow and hopefully I'll get a couple more years out of it. :-)


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PostPosted: Tue Nov 21, 2017 7:26 pm 
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If the first garage you went to were worth their salt they should have found the lack of petrol pressure problem at a very early stage.

They told you they did a petrol pressure test - I'd go back and ask to see them connect their petrol pressure meter onto your fuel rail... I bet they don't have a pressure tester and don't know what to expect from a squirt test. I would have noticed the low pressure just doing the squirt test that I advised. Since the problem would be lack of fuel, easy start should also have got the engine running... I didn't say squirt it into the air intake, I said squirt it into the manifold... there's more risk of a backfire due to lean mixture all the way back through the filter if you squirt it into the air intake.

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