losing power please help

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p38on22s

New Member
Posts
324
Location
uk--- clacton on sea
hi guys my p38 diesel loses power and cuts out while driving then its a pain to start but it will sit there for hours on tick over and wont die but if you drive it it dies within a few miles what are the chances of it being a duff fuel pump in the tank or could it be anything else cheers
 
Two ways to check your oin-tank pump.
The expensive way - fill your tank up and see if the fault goes away.
The cheaper way - disconnect the fuel line, under the bonnet before the lift pump. Woith the ignition on you should get fuel pumping out, if not your pump is blocked or knackered.

However, have you investigated the filter? Not just looked at it but looked into it, or, for the sake of a couple of quiid, replaced it. They can look good from the outside but collapse internally cutting off the fuel flow but still let enough through for a tick-over.
 
I'd agree........check/change fuel filter........regardless! Try cranking with fuel pipe into suitable container, at idle. Reconnect pipe to re-fuel motor, disconnect and try again with accelerator depressed if flow static pump's u/s if flow increases pump gd!

Goes without saying, needs a n other to help, and be bloody carefull with weasel everywhere!!!
 
i change the filters every 5k so will try that again did flush it thru yesterday when it died on the side of the road,was also going to check the fuel pump relay under bonnet but not sure if it does the tank pump or the lift pump
 
put a new fuel filter on today,tried a relay out of other rangey thats working (at mo) and cracked off the pipe what goes to the injector pump turned the ignition on and nothing tried it a dozen times then it start to pump diesel for a second then stopped tried again for at least a dozen times still nothing so can i take it as the pump is fubar
 
p38on22s said:
put a new fuel filter on today,tried a relay out of other rangey thats working (at mo) and cracked off the pipe what goes to the injector pump turned the ignition on and nothing tried it a dozen times then it start to pump diesel for a second then stopped tried again for at least a dozen times still nothing so can i take it as the pump is fubar
Click to expand...

Either the pump is fubar or it's the fuse box, The pump only runs while the glow plug light is lit if the engine doesn't start.
 
just put a new pump in the tank and it fired up lovely and really easy left it ticking over for half hour, then went down the road for a 20 mile drive and guess what it was sweet never missed a beat never lost power well worth £55 for a pump and about 2 hours work to fit it job done and happy again
 
dogsbody said:
Two ways to check your oin-tank pump.
The expensive way - fill your tank up and see if the fault goes away.
The cheaper way - disconnect the fuel line, under the bonnet before the lift pump. Woith the ignition on you should get fuel pumping out, if not your pump is blocked or knackered.

However, have you investigated the filter? Not just looked at it but looked into it, or, for the sake of a couple of quiid, replaced it. They can look good from the outside but collapse internally cutting off the fuel flow but still let enough through for a tick-over.
Click to expand...

Why you no rissen glas hopper. With ignition on you WILL NOT get fuel pumping out of fuel line. Fuel pump only works when glow light is on. When engine is being cranked. When engine is running. With ignition switched on after glow light goes out it WILL NOT RUN. Unless you crank engine or start engine. OR cycle glow light on and off.
 
wammers said:
Why you no rissen glas hopper. With ignition on you WILL NOT get fuel pumping out of fuel line. Fuel pump only works when glow light is on. When engine is being cranked. When engine is running. With ignition switched on after glow light goes out it WILL NOT RUN. Unless you crank engine or start engine. OR cycle glow light on and off.
Click to expand...

I might have problem with my DSE.
I'll have a look tomorrow.
I could have sworn that my pump runs whenever the ignition was on.
That'll teach me not to swear.

Mind you when I was testing my pump the engine was cold and I didn't leave the ignition on for long, as usual I was working alone.
 
dogsbody said:
I might have problem with my DSE.
I'll have a look tomorrow.
I could have sworn that my pump runs whenever the ignition was on.
That'll teach me not to swear.

Mind you when I was testing my pump the engine was cold and I didn't leave the ignition on for long, as usual I was working alone.
Click to expand...

Well if it does it shouldn't. As i say it is activated by glow circuit for as long as that is active (about 7 seconds), then stops. Then by cranking engine, then when engine exceeds 500 rpm cranking position is isolated to prevent engine being cranked whilst running and pump relay is held in directly by current from alternator.
 
when i took the old pump out it connected it up to a live and earth and it only managed a small squirt every now and again but the new one on same test supplied a nice stream
 
p38on22s said:
just put a new pump in the tank and it fired up lovely and really easy left it ticking over for half hour, then went down the road for a 20 mile drive and guess what it was sweet never missed a beat never lost power well worth £55 for a pump and about 2 hours work to fit it job done and happy again
Click to expand...


Your welcome.
 
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