fuel pump

hi, just had a fuel pump fitted in the diesel tank, after being messed around by the poxy garage we finally got the truck back but im sure its not right, the pump is constantly running and its quite noisy too, any suggestions?

td5 fuel pumps are quite noisy by nature and will be runing from the moment the key hits position 2. should be a low whiny hum. if it sounds like a dying cat it is probably on its` way out... also check your fuel filter has been changed @ the same time as the pump was done.

^^^^^^ totally right, a clogged filter will make the pump noisyer(the dying cat thing is marvelous) ....though if everything it's all right then with ignition on pos. II the pump must stop after 3 minutes( ECM must deenergize te fuel pump relay) ....so that constantly running thing becomes annoying only if it exceedes 3 minutes

The other thing that makes a TD5 fuel pump NOISY is GAS in the fuel.

(Most of the noise actually comes from the stupid fuel filter in the right rear wheel-arch)

If there is ANY gas leaking past an injector copper washer, which is a common problem with a TD5, several bad things can happen, like a noisy fuel pump, poor starting or NOT starting, and rough running. This fault will not show up on the dash display.

You can test for this - turn the key till the dash lights come on but do NOT start the engine. The pump should start, and for a second or two it might be a bit squealy-cat sloshy noise, but it should suddenly run smoothly, no squeals or sloshes.

The pump should run for a couple of minutes then stop.

Turn the key OFF, then ON and start the engine. Let it tick over for a minute or two.
Now stop the engine. then turn the key ON but don't start the engine.

If the pump noise is squealy sloshy again, chances are there's GAS getting into the fuel system.

However, the FIRST thing to do with a TD5 is to fit a clean FUEL FILTER, taking great care when you change it that you take TWO O-rings off with the filter. The TD5 has a very bad habit of leaving the small O-ring on the filter head, where you won't notice it. Everyone who changes a TD5 fuel filter should make sure next time they do it that there isn't an old O-ring trapped on the filter-head. It needs ONE big O-ring and ONE small one.

what he said!
just to add to that, when u done doing said filter, don`t forget to reprime the system by turning the key to position 2 and then presing the accelerator down fully five times. the engine management light should start to blink and stay like this for around 3mins...

CharlesY said:

taking great care when you change it that you take TWO O-rings off with the filter. The TD5 has a very bad habit of leaving the small O-ring on the filter head, where you won't notice it. Everyone who changes a TD5 fuel filter should make sure next time they do it that there isn't an old O-ring trapped on the filter-head. It needs ONE big O-ring and ONE small one.

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If i recall well i never did that and i've noticed that after i fitted the last filter it's starting a bit harder...i presume i've lost both of them untill now...could you eventually give me the o-rings dimensions or part number please.

sierrafery said:

If i recall well i never did that and i've noticed that after i fitted the last filter it's starting a bit harder...i presume i've lost both of them untill now...could you eventually give me the o-rings dimensions or part number please.

Click to expand...

Every new fuel filter should come with the O-rings in the box.

Rub them with grease, and stuff them into the grooves in the new filter.

Take off the old filter and do TWO things:
1. make sure BOTH O-rings come off with it, and even if they do,
2. make sure there isn't ANOTHER old smaller O-ring still trapped on the filter head.

As I said a few days back, at one stage my TD5 Disco had THREE small O-rings in place, which makes fitting the filter less than easy. It was my fault for not checking 1 and 2 above.

CharlesY said:

Every new fuel filter should come with the O-rings in the box.

Rub them with grease, and stuff them into the grooves in the new filter.

Take off the old filter and do TWO things:
1. make sure BOTH O-rings come off with it, and even if they do,
2. make sure there isn't ANOTHER old smaller O-ring still trapped on the filter head.

As I said a few days back, at one stage my TD5 Disco had THREE small O-rings in place, which makes fitting the filter less than easy. It was my fault for not checking 1 and 2 above.

Click to expand...

Thanks for that.......how an apparently simple thing could have its own little secrets