Volvo 850 power loss under hard acceleration Topic is solved

Post by **misha** » 29 Jan 2019, 07:30

I don't get it...it should do the opposite.
How accurate is your pressure gauge?

Try to prime the system few times...key in pos.II...wait 2 -3 seconds...back to pos.I and imediately again to pos.II...Do that 3-4 times and watch the pressure on gauge.

Jaumme · Post by **Jaumme** » 29 Jan 2019, 09:08

My pressure gauge is homemade with a Volvo truck oil pressure gauge but its supposed to be accurate

Jaumme · Post by **Jaumme** » 29 Jan 2019, 09:22

I will block the return Lane now if the pressure os nota comming Up pump is dead And if It comes Up fpr maybe is stuck open?

Jaumme · Post by **Jaumme** » 29 Jan 2019, 09:26

I hace a theory Will confirm later when i do the test

Sommerfeldt · Post by **Sommerfeldt** » 29 Jan 2019, 10:02

misha wrote: 29 Jan 2019, 06:48 Here we go again...
Fpr is dictating what fuel pressure would be in the system...not the pump.
Fpr is vacuum controlled...that said....pressure varies as vacuum varies....Fuel pressure is not steady in all running conditions.

Here we go again. How about you pack up the smugness and read what I wrote, which is exactly what you peppered with .......’s and rewrote.

The pump WILL deliver 3 BAR because that’s what the pumps for these cars will deliver. If the pressure IN THE FUEL RAIL is different, then that’s NOT BEING CONTROLLED BY THE PUMP, or the pump has a fault. So pressure IN is going to be 3 bar, because that’s what the pump delivers. I never said it was static inside the fuel rail, but if the pump doesn’t deliver 3 bar, then something’s amiss.

Focus.....on.....reading...., and.... less.... on.... smileys...., .....misha.....

- S

Post by **misha** » 29 Jan 2019, 10:26

Just to be clear here...
Are you saying that pump alone will make 3bar pressure?
If you simply put a pump in the jar or can with fuel and supply it with 12v source....and it will squirt the fuel with pressure of 3bar out of the feed line?

Is that what you're saying?

Sommerfeldt · Post by **Sommerfeldt** » 29 Jan 2019, 11:06

The Bosch fuel pumps supplied for the 850 has an operating pressure of 300 KPA, with a flow rate of 120 liters per hour. System pressure should be delivered from 50-60% of rated voltage.

- S

Post by **misha** » 29 Jan 2019, 11:13

I didn't ask you that.
I know pretty good what spec they are.
Can you respond to my question please?

Sommerfeldt · Post by **Sommerfeldt** » 29 Jan 2019, 11:24

I think I did - if you stick the pump inlet in a jar of fuel and turn it on, it'll spray out 120 liters of that fuel in an hour. So bring a big jar.

- S

Post by **misha** » 29 Jan 2019, 11:26

Sommerfeldt wrote: 29 Jan 2019, 11:24 I think I did - if you stick the pump inlet in a jar of fuel and turn it on, it'll spray out 120 liters of that fuel in an hour. So bring a big jar.

- S

Read again...i asked you about pressure.