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| another iveco wont start; started got 50 yards stopped | |
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| Tweet Topic Started: Aug 3 2015, 06:39 PM (1,119 Views) | |
| wayneb | Aug 3 2015, 06:39 PM Post #1 |
Newbie
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hi it's another iveco that started went 50yards then stopped and won't start again.changed pressure regulator on pump,still nothing.diagnostic test showed low pressure on rail but no fault code. only way it will start is by clamping return pipe from filter. thanks in hope and expectation. Wayneb |
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| Spooky_b329 | Aug 3 2015, 08:05 PM Post #2 |
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Administrator
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If its a 2.3 or 3.0, check low pressure fuel pump on chassis. More detail in the fix it fast thread pinned at the top of this forum. |
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| tuftey | Aug 4 2015, 04:37 AM Post #3 |
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sounds like pump on chassis or in line filter blocked you could pressurise the rail to see if it will kick up by hand |
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| wayneb | Aug 5 2015, 10:00 AM Post #4 |
Newbie
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Sorry for the delay but been rather busy.it's a 2006 2.3 getting plenty of fuel to diesel filter,inlet and outlet pipes running in right direction,but return? Pipe on top of filter appears to be running wrong way I.e from filter to pump instead of pump to filter.if this pipe is clamped off it starts and runs with no problem.as stated before brand new pressure regulator fitted to pump. Cheers WAYNEB |
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| Bazil-S | Aug 5 2015, 07:18 PM Post #5 |
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Hi, The pipe on top of the filter is the priming pump return and the banjo fitting is the low pressure circuit, pressure regulator. The high pressure pump collects all the returns pipes and delivers to tank. In your case can be faulty the pressure regulator, on top of the filter, or there are leaks to return in the high pressure circuit, ie faulty injectors. |
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| wayneb | Aug 10 2015, 11:15 AM Post #6 |
Newbie
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Thanks for your response. I have taken fuel valve /regulator off top of filter and it appears to be in good condition .moves freely,seal is intact and no wear marks.is there any way of knowing for sure if it's faulty ? There is not a drop of fuel getting from pump to rail/injectors it is all being returned to tank unless I clamp of the small pipe from top of filter to pump,it's then being forced up the leak off pipe the wrong way and sending fuel to injectors and will then start straight away.but as soon as clamp is released all fuel to rail is cut out. There have been no lights on , could it be hp pump or mechanical pump failure.is there any sure way to know/check? Thank you for your advice . |
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| Bazil-S | Aug 10 2015, 06:52 PM Post #7 |
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Hi, For low pressure circuit there is a test kit consisting of three pressure gauges, and several fittings. Some time ago, I posted a guide how to test the fuel circuit, see this topic: http://ivecoforums.com/topic/8938130/1/#new The fuel system has three pumps, the first is an electric priming pump, the second is a mechanical feeding pump, and the third is the high-pressure pump. The electric pump deliver the fuel up to 5 bar to the fuel filter which has on top a check valve. This valve (regulator) adjusts the fuel pressure to 0.4-1.0 bar on the filter outputs and the feeding pump input. So, the mechanical feeding pump receive only a very low pressure (nominal value: 0.7 bar). This pump increase the pressure to approx 5.0 bar for the input of the high pressure pump. A possible scenario. If the shaft between the high pressure pump and feeding pump is broken, then the fuel will not reach to the common rail because of the fuel low pressure on the input of the HP pump 0.7 bar. If you clamp the return hose you will block the filter check valve and the electric pump pressure will no longer be adjusted, instead will be delivered directly to the input of the high pressure pump through the feeding pump. The feeding pump will act as a pipe and the electric pump and high pressure regulator will be overwhelmed, but the high pressure pump will have enough pressure on the input... In other words you will deliver the pressure from electric pump directly to the high pressure pump, by passing the feeding pump. |
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