200TDI fueling problem

 
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Yule
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PostPosted: Wed Jun 13, 2018 4:54 pm    Post subject: 200TDI fueling problem Reply with quote
I have spent the last 3 days trying to get Henry to start on his own - all to no avail. The problem seems to be with air getting into the fuel system thereby stopping him from starting by himself. I have replaced a couple of dodgy fuel lines, tried another fuel lift pump, and bled the system about 200 times (feels like it), but he still refuses to start unless I spray a load of rocket fuel down the air intake. I have tried bypassing the fuel filter - still nothing. When I prime the fuel uplift there is fuel coming out of the bleed screw on the fuel filter housing, but nothing gets as far as the injectors - even with the ignition on to open the stop solenoid. I am starting to get really frustrated so could do with some ideas please folks. My mate says that air must be getting in somewhere, but I have no idea where.

Yours confused, Paul.
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1975 200TDI Series 3 - Henry
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Alan Drover
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PostPosted: Wed Jun 13, 2018 5:33 pm    Post subject: Reply with quote
Afternoon Pau. I'm not too knowledgeable on diesels but it could be a fault with the shut off solenoid. Are you sure it's operating properly with the ignition switched on? That's the first thing I would check.
Keep us updated.
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Alan Drover.
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Also a 1977 Stage 2 MGB GT.
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Yule
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PostPosted: Wed Jun 13, 2018 7:34 pm    Post subject: Reply with quote
Hi Alan,

The fuel stop solenoid is working fine. I pulled the connection off with the ignition switched on and you can hear it clicking up and down as you reconnect the wire.
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BigJohn
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PostPosted: Wed Jun 13, 2018 7:44 pm    Post subject: Reply with quote
A number of things to try. You may have already done these.
Check the hose going to the fuel pickup in the tank. I could be perished and letting air in or it could be collapsing.
If you have air in the system, the injector pump might be air locked. There are bleed screws on it. You need to loosen them while turning the engine over.
Check that you are actually getting fuel to the injector pump.
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Yule
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PostPosted: Wed Jun 13, 2018 8:42 pm    Post subject: Reply with quote
Hi John,

I already checked the fuel line to the tank - it looks fine, but I have ordered a couple of new gaskets for the tank itself. If there was an airlock in the injection pump, I would have thought that the engine would not run, yet with a good spray of damp start, he starts and runs well. One thing of note - when using the primer on the uplift pump, after a while it seems to 'lose' pressure. Is this down to drawing air?
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Alan Drover
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PostPosted: Wed Jun 13, 2018 9:20 pm    Post subject: Reply with quote
Probably the same as the petrol lifter pump. Once the carburettor is full the same happens so it is probably there is enough fuel in the injector pump.
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Alan Drover.
1975 SWB hardtop with a 2.5 petrol engine, overdrive, front disc brakes, parabolic springs, hand throttle, Defender doors and Wolf wheels.
Also a 1977 Stage 2 MGB GT.
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Alan Drover
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PostPosted: Wed Jun 13, 2018 9:52 pm    Post subject: Reply with quote
Paul, have a compression test done. Don't use a compression tester for petrol engines though as they don't go high enough. Do you know any friendly garages who could do it?
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Alan Drover.
1975 SWB hardtop with a 2.5 petrol engine, overdrive, front disc brakes, parabolic springs, hand throttle, Defender doors and Wolf wheels.
Also a 1977 Stage 2 MGB GT.
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Yule
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PostPosted: Thu Jun 14, 2018 2:45 pm    Post subject: Reply with quote
Hi Alan,
I have a friend on standby - unfortunately he works for Aston Martin and they have first dibs on him Sad
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BigJohn
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PostPosted: Thu Jun 14, 2018 5:07 pm    Post subject: Reply with quote
Are your glow plugs actually working properly? The point about compression is good though as if you have ring or bore wear, you can have poor compression when the engine is dead cold, but once the oil starts flowing and the engine heats up you have sufficient increase in compression to keep running.
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lovejoy633
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PostPosted: Thu Jun 14, 2018 6:14 pm    Post subject: Reply with quote
I agree with Big John, check your glow plugs.
I recently bought some cheapies from paddocks and when I tested them, all 4 were duff.
I replaced with quality parts and problem solved.
Paddocks did not bother to reply to my complaint about sub standard cheap foreign parts.
buy right - buy once.
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Yule
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PostPosted: Fri Jun 15, 2018 6:28 am    Post subject: Reply with quote
Thanks for the advice guys. I went to M&M Land Rover yesterday and had a chat with the guys in the garage at the back. Both of them agreed that it sounds very much like there is an air draw somewhere. I have new gaskets & seal on order for the fuel tank and will be replacing the fuel pipes that I haven't so far (at least if it is not them I'll still have new pipework so that's good). If none of this works then I'll try to get a pressure test and check the plugs.
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Paul.

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lovejoy633
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PostPosted: Wed Aug 08, 2018 8:05 pm    Post subject: Reply with quote
Hi Yule
I was interested in this thread.
Have you identified the problem yet ?

rgds
Lovejoy
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Yule
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PostPosted: Fri Aug 10, 2018 9:00 am    Post subject: Reply with quote
Hi Lovejoy,

Sorry, I haven't had much time to myself since I started this thread. What with the heat, work & a weeks holiday I haven't progressed at all. I am away both this and next weekend so nothing happening there either. I'll post when I do get around to doing something. I have got all the bits that I need (or so I think).

regards
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Paul.

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