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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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no power to fuel pumpViews : 481 Replies : 9Users Viewing This Thread : |
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Jun 11th, 2024, 18:35 | #1 |
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Last Online: Jul 7th, 2024 20:34
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Location: Dublin
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no power to fuel pump
evening
Im looking for help / ideas on what could cause my in tank fuel pump to no have power going to it ? new pump fitted .new green relay fitted took it out and tested the pump on the bench , it works but in the car ...No |
Jun 12th, 2024, 02:04 | #2 |
VOC Member
Last Online: Yesterday 10:42
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Location: Gloucester
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The radio interference suppression relay and the crank position sensor can also go faulty and lead to no fuel.
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Jun 12th, 2024, 09:43 | #3 |
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Location: Amersfoort (NL)
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Fuse 11
Assuming it is a 940, check fuse no. 11. This fuse is between the fuel pump relay and the fuel pump. If there is no power on this fuse during cranking, there is something wrong with either the fuel pump relay or the wiring between relay and fuse. If there is power on this fuse during cranking, the fault must be in the wiring between fuse box and fuel pump.
If the tacho needle is moving during cranking, the crank position sensor and radio suppression relay are fine. |
Jun 12th, 2024, 12:48 | #4 |
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taco needle bounces about 5 mm
fuse 11 is good the pump works on the bench when connected to a battery its an 88 740 b230E Last edited by volvobm; Jun 12th, 2024 at 12:50. |
Jun 12th, 2024, 17:19 | #5 |
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Test wire
I would run a temporary wire from fuse 11 to the fuel pump connector to rule out a faulty wire.
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Jun 12th, 2024, 19:18 | #6 |
Offgrid camper
Last Online: Yesterday 18:55
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I've got a similar problem on my B200E, but I've got no spark and no tacho jump. I've had 2 740s fail due to a faulty fuel pump relay, but I don't think that affects the lift pump. Please correct me if I am wrong. I'm about to take my pump out, but I've been waiting for a fancy tool to remove the retaining ring.
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Jun 12th, 2024, 21:10 | #7 |
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my fancy tool was a rubber mallet and either a piece of wood or the bar from a jack . you don't want to put anything sharp on it . and find yourself a good work position
ive had mine in and out 20 times now . Vaseline is a must Last edited by volvobm; Jun 12th, 2024 at 21:13. |
Jun 12th, 2024, 22:04 | #8 |
Go redblock or go home
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Location: UK
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Same here, a blunt instrument being massaged with a hammer does the job.
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Jun 13th, 2024, 02:20 | #9 |
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There is a good guide on the Skandix website which was what I mostly followed, at least getting the pump out.
https://www.skandix.de/en/documents/...-tank/3000438/ And yes, +1 for the block of wood and mallet “special tool”. |
Jun 26th, 2024, 13:24 | #10 |
Volvologist
Last Online: Jul 17th, 2024 13:50
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Location: Bangor - Norn Iron
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The earth wire had corroded off the tank unit on my Volvo.
Have you actually checked for voltage and earth at the tank??
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