V70 T5 losing fuel pressure and throttle at 1/4 tank petrol

Alfiehiron · Post by **Alfiehiron** » 20 Dec 2025, 10:33

I keep having this problem as soon as I hit 1/4 tank petrol. The car will have barely any throttle and it will either end up stalling or be fine if I sit for a few mins.

If I turn the car off and back on after a few mins I’ll be able to drive for another 10-20 mins before it happens again.

I’ve changed the fuel pump to a Bosch one, changed pressure sensor to a Bosch one, changed fuel filter to a Mann filter and the pump module attached to the tank

Any help would be amazing!!

Post by **vtl** » 20 Dec 2025, 10:41

Fuel level sending unit?

Alfiehiron · Post by **Alfiehiron** » 20 Dec 2025, 11:30

How does that side work? The wiring for it looks like it’s only job to is measure the level on that side?

Post by **vtl** » 20 Dec 2025, 11:32

Alfiehiron wrote: ↑20 Dec 2025, 11:30 How does that side work? The wiring for it looks like it’s only job to is measure the level on that side?

Yes. You may be running on fumes, while the sending unit still says there's 1/4 fuel left.

Alfiehiron · Post by **Alfiehiron** » 20 Dec 2025, 12:13

I opened it up at 1/4 and looked in and there’s plenty of fuel in there.

Post by **vtl** » 20 Dec 2025, 12:30

Alfiehiron wrote: ↑20 Dec 2025, 12:13 I opened it up at 1/4 and looked in and there’s plenty of fuel in there.

Fuel line between halves is not kinked? Need to route it supercarefully, or you'll be starving the fuel pump.

Post by **vtl** » 20 Dec 2025, 12:30

Also what fuel pump did you get?

Alfiehiron · Post by **Alfiehiron** » 20 Dec 2025, 14:15

The fuel lines are 100% not kinked and it’s the Bosch one

Bosch code - 1 582 980 141

Post by **vtl** » 20 Dec 2025, 17:08

Alfiehiron wrote: ↑20 Dec 2025, 14:15 The fuel lines are 100% not kinked and it’s the Bosch one

Bosch code - 1 582 980 141

I put this same pump into my 2005 XC70.

Does it look like there's a vacuum buildup in the fuel tank? Vacuum would work against fuel pump. Not sure how EVAP stuff looks in your market, maybe a solenoid is stuck or canister is clogged?

Post by **jonesg** » 20 Dec 2025, 17:52

try loosening the gas cap.
check fuel pump duty cycle.