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Old 14-06-18, 07:23 PM   #1
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Default fuel lift pump in tank

Hi
My 53 plate 307sw2.0hdi (with 168000miles on the clock) recently broke down out of the blue. Was running perfectly then suddenly no power.

I found that lift pump was not working so I've bought a used one from ebay.
Did not fit tonight as i'm waiting for new seal so just connected the power cable to replacement to check if pump would make a noise, but nothing. Does the pump need to be submerged in diesel for it to work, is there a sensor on it that detects fuel? Sorry if this appears to be a silly question.


thanks in advance
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Old 14-06-18, 08:36 PM   #2
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Pump should run for a few seconds on Ign on.

Are you sure you have a lift pump in the tank only some early Bosch models have them.

Siemens systems do not have one, check under bonnet for primer bulb if unsure, if there is a bulb no pump
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Old 14-06-18, 09:29 PM   #3
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i saw something similar a while ago, car stopped and the customer went online to find a cure and decided that it needed a new pump in the tank. he fitted a new pump and got the car going but about a 100 miles later and 2 new primer bulbs has burst. it was a Siemens system and he had fitted a tank pump and surprisingly it worked but was pressuring the system and bursting the primers.
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Old 03-09-18, 07:10 PM   #4
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Default fuse F4

Hi
Finally getting around to try and sort this out.

Symptoms are no power to lift pump in tank and fuse F4 keeps blowing, so engine turns but will not start. Lift pump and relay are fine so something is causing fuse F4 to blow.


Has anyone any ideas and perhaps wiring diagram for lift pump?


Thanks in advance
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Old 03-09-18, 09:36 PM   #5
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You still did not answer the question are you SURE your car has a lift pump.

ALL looms have the wiring to the pump regardless of the presence of a pump as the looms are standard

ALL cars have the relay people call a pump relay but its not really a pump relay.

Bosch injection has a pump siemens does not
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Old 04-09-18, 06:54 PM   #6
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Hi
Yes definitely has a lift pump in the fuel tank, I've tested this directly with a 12 volt supply and it works fine. Just need to figure out now why fuse F4 is blowing


cheers
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Old 04-09-18, 06:57 PM   #7
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I would be checking the feed cable to it for shorting.
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Old 04-09-18, 06:59 PM   #8
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So if you power up the pump in the tank then try to start car does it start ?
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Old 04-09-18, 07:41 PM   #9
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Quote:
Originally Posted by gags37 View Post
Hi
Yes definitely has a lift pump in the fuel tank, I've tested this directly with a 12 volt supply and it works fine. Just need to figure out now why fuse F4 is blowing


cheers
My wifes hyundai had exactly the same. Turned out to have frayed wiring under the glove box.
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Old 08-09-18, 09:32 AM   #10
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thank you for the replies

Quote:
So if you power up the pump in the tank then try to start car does it start ?
Tried this and still won't start.

As I don't have a wiring diagram I'm going to disconnect all the sensors in the engine bay and connect them one by one to see if it's one of them that causes the F4 fuse to blow. As i'm a novice with vehicle electrics notb sure how else to approach this.
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