98 v70 fuel pump

ODONOVAN · Post by **ODONOVAN** » 02 Jul 2011, 12:47

I am trying to figure out whether my v70 turbo has one or two fuel pumps. I hear it turn on in the passenger side rear seat area. The problem is ,is that it does not come on every time. I just replaced the relay ,the big red one but that didn't do anything. So now I'm trying to figure out if the fuel pump is faulty and which one is it if there are two.I'm assuming that there is one in the tank and another somewhere else. Is there some simple test that I can do before dropping the tank.Thanks for any suggestions

Post by **jimmy57** » 02 Jul 2011, 13:56

Only one pump.

Post by **jblackburn** » 03 Jul 2011, 12:29

And you definitely don't need to drop the tank. There is an access panel in the trunk under the carpet.

Post by **FlyingVolvo** » 03 Jul 2011, 15:08

jblackburn wrote:And you definitely don't need to drop the tank. There is an access panel in the trunk under the carpet.

Luckily for you non-AWD folk...

Post by **pkc303** » 03 Jul 2011, 15:29

The old 240's had two pumps.

Post by **BEJinFbk** » 03 Jul 2011, 18:23

ODONOVAN wrote:I am trying to figure out whether my v70 turbo has one or two fuel pumps. I hear it turn on in the passenger side rear seat area. The problem is ,is that it does not come on every time. I just replaced the relay ,the big red one but that didn't do anything. So now I'm trying to figure out if the fuel pump is faulty and which one is it if there are two.I'm assuming that there is one in the tank and another somewhere else. Is there some simple test that I can do before dropping the tank.Thanks for any suggestions

There are some MAJOR differences between FWD and AWD's.
When asking for assistance, you may wish to make a point of the AWD.

There are indeed two pumps in an AWD V70. The AWD has a funny shaped
tank with two low points. The saddle shape accomodates the rear driveshaft.
An ejector, ( or transfer ) pump keeps the fuel pump side full enough to
work. I'm not sure if it's on all the time or not. Maybe Jimmy 57 knows.

The official Volvo method of servicing the pumps is to drop the entire rear end
to allow lowering the tank a foot or so and providing access to the tank's top/front.
Others have chosen to cut through the floor pan ( that involves compromising one
of your rear seat mounting pints...Not my first choice...) and reaching the
fuel pump from inside the car. Another method is to remove enough of the rear
suspension to allow the tank to be flexed and forced low enough to make the
change. Kinda brutish, but it is an option.

Here's a recent post on the topic:
https://www.matthewsvolvosite.com/forums ... =1&t=40326

No matter which method you choose, here's a pic to give you an idea of the scope of this project:

: Gen 1 AWD pumps.jpg (50.17 KiB) Viewed 4593 times

Many AWD owners have tackled this issue.
Searching the subject here and at other
Volvo forums should give you more insight.

Post by **jimmy57** » 04 Jul 2011, 06:29

The thread title is "98 v70 fuel pump" but the profile info shows "AWD".
IF the car the post is about is not the profile car and is FWD then access panel is the way to get to the top of the tank mounted pump.
If the post is about an AWD car then the suspension/tank gets dropped or the rear floor gets cut to get to the RH side pump.
The ejector pump is not a pump as any of us would call it. Ejector pump is an assembly with a jet that blows fuel across an opening into a hole. The feed fuel for ejector pump is the diverted fuel from fuel pressure regulator as the main pump has a significant oversupply that the FPR is diverting all the time. The hole the fuel is squirted into is connected to a larger diameter line and goes back to the RH side and is dumped into the cup the electric pump is mounted in. The jet of fuel forced into the hole creates suction from the venturi effect and pulls LH tank fuel with it to be deposited into the fuel pump vessel. If the LH side is emptied there is just the supplied fuel being sent back over to the RH side. You can't run an electric pump dry so the solution has to be a way to move the LH side fuel without using a direct electric pump on that side.
The newer models with double sump tanks use two pumps but the second pump has a single purpose of sitting on the RH side in fuel and delivering fuel to the LH side ejector "pump". These newer cars have the main pump run at whatever speed is required to keep fuel pressure in range and have no extra flow to send to the ejector pump and therefore need a real pump to send fuel to the ejector affair.