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Fuel ejector/venturi/vacuum pump not working,

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Travisbrown
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Fuel ejector/venturi/vacuum pump not working,

Post by Travisbrown » Thu Aug 29, 2019 3:56 am

A few weeks ago the fuel pump died. Wasn’t near home so local shop replaced.

Car ran fine until it got down near empty. Then ran out of gas. Filled up a bit, same thing when it ran down to just near the start of the empty indicator on the fuel gauge.

So seems like the ejector wasn’t working.

Took it back to the shop and the mumbled something about not being enough pressure to move fuel from one side to other, so confirmed my ejector pump theory. They said they pulled the pump and reinstalled and fixed now.

Except it isn’t. Same problem. Car dies when it just hits the low fuel warning on the fuel indicator.

So anyone know what the compromise is on the ejector before I drive the couple hours back (again) to the shop to fix (again)? From what I understand, the ejector pump is a passive venturi: the pump pumps fuel over to the ejector, the ejector picks up fuel from far side tank bottom and transits it back to the pump side.

What could it be other than a hose not attached? Seems like there is little to go wrong the ejector side.
Last edited by Travisbrown on Thu Aug 29, 2019 11:42 am, edited 1 time in total.



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oragex
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Re: Ejector pump not working

Post by oragex » Thu Aug 29, 2019 9:22 am

The 'ejector' name is a little unusual - forum members may not have heard of it. I would perhaps try rename the thread - no fuel at the rail when tank half empty. I think I've already read a few times about this issue, but don't remember what would be a fix - often times unfortunately owners don't come back with an update.



Travisbrown
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Re: Fuel Ejector pump not working

Post by Travisbrown » Thu Aug 29, 2019 11:37 am

Thanks for the reply. Yeah, it's a weird name. What would you call it?

It's this part: https://www.tascaparts.com/oem-parts/vo ... gIri_D_BwE

The tank is a saddle design to allow clearance for the exhaust. Fuel pump is on the passenger side. When fuel gets low you would have essentially two different tanks with a few gallons in each. To get the isolated fuel on the driver side, the fuel pump drives fuel over to a venturi on the driver side that sucks up driver-side fuel and ejects it over to passenger side to be available for the fuel pump.

This type of setup in fluid transfer is called an ejector pump. Common in sump systems (which this V fuel pump system is). Not sure what else to call it here. With Volvos I've only ever seen it referred to as ejector pump (or 'that second pump,' or 'what?').

Thing is, there's nothing to break on the part. Hose from the pump to this injection molded, non-moving, non-wear passive part, and hose back. The only reason I can think it's not working is there isn't sufficient pressure getting to it to draw fuel - i.e. either hose not hooked up, plugged or torn, or fuel pump otherwise not driving fuel to the device.

Before I go back to the shop the *third* time to have them sort out (it's almost two hours away and basically wastes a day), so trying to avoid a fourth or admit defeat), I am just wondering if anyone has any ideas or experience with similar issue and causes. The new fuel pump seems to be otherwise working fine.

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Re: Fuel ejector/venturi/vacuum pump not working,

Post by volvolugnut » Thu Aug 29, 2019 2:40 pm

I replaced my 2001 V70 fuel pump last fall. I am not sure if all parts are the same for 2003, but what you have described sounds like the same system. I did not removed the fuel tank to replace pump. You can open access ports under floor on both halves of the tank. The line has to be pulled from right side to left side over the hump. You use a string or wire tied to the end of the hose when the pump and hose are removed and then pull it back to other side when new pump is installed. As I recall, the non pump side has the hose end attached to the tank bottom with a clip or bolt. It can't just be loose in the tank.
Perhaps they did not get it anchored to the bottom or kinked the hose some where.

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Re: Fuel ejector/venturi/vacuum pump not working,

Post by - Pete - » Thu Aug 29, 2019 3:32 pm

2003 what?

That's a booster vacuum ejector. It's not a pump. I had to replace one recently, it runs off vacuum & is in the same circuit as your brake booster. If this part cracks or fails, you loose boosting to your brakes = HARD pedal & no assist.

But your symptom of fuel relation & not being able to pump fuel from one side of the tank to the other I believe is unrelated to this part.
Last edited by - Pete - on Thu Aug 29, 2019 11:42 pm, edited 1 time in total.


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Re: Fuel ejector/venturi/vacuum pump not working,

Post by Travisbrown » Thu Aug 29, 2019 5:09 pm

- Pete - wrote:
Thu Aug 29, 2019 3:32 pm
2003 what?

That's a booster vacuum ejector. It's not a pump. I had to replace one recently, it runs off vacuum PSI & is in the same circuit as your brake booster. If this part cracks or fails, you loose boosting to your brakes = HARD pedal & no assist.

But your symptom of fuel relation & not being able to pump fuel from one side of the tank to the other I believe is unrelated to this part.

Hmm. I wonder what the part is for the fuel ejector then.



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Re: Fuel ejector/venturi/vacuum pump not working,

Post by Travisbrown » Thu Aug 29, 2019 5:12 pm

- Pete - wrote:
Thu Aug 29, 2019 3:32 pm
2003 what?
V70. Sorry, I thought the forum displayed the model too. 2003 V70 T5 2.3 standard.



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Re: Fuel ejector/venturi/vacuum pump not working,

Post by abscate » Thu Aug 29, 2019 8:36 pm

How many “ miles to empty” are displayed on the trip computer when it quits?

Is this whole thread the “ ran out gas” thread?


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Re: Fuel ejector/venturi/vacuum pump not working,

Post by Travisbrown » Thu Aug 29, 2019 10:25 pm

abscate wrote:
Thu Aug 29, 2019 8:36 pm
How many “ miles to empty” are displayed on the trip computer when it quits?

Is this whole thread the “ ran out gas” thread?
After the new fuel pump, it stalls with 1/8th tank remaining. Pretty much right where the light comes on. 140-150kms left to empty. It’s repeatable. And where I’d normally fill up from empty with 65 litres, now I fill up with ~10 litres less.

I don’t know what the “ran out of gas” thread is. I’m trying to figure out why left side fuel isn’t transferring to pump side anymore.



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Re: Fuel ejector/venturi/vacuum pump not working,

Post by abscate » Fri Aug 30, 2019 3:12 am

They have messed up the hoses in the fuel tank somehow. It’s a subtle job and easy to mess up if they haven’t studied it carefully.

It has nothing to do with the part shown, it’s part of the new fuel pump that’s has to be pulled over with messenger line as noted above

In the XC90 forum, user shockwave chased this for a few months before finding a kinked line from a poor installation on this same setup.


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