99 v70 fuel pressure
 

What should the fuel pressure be, at the schrader valve on the fuel rail of my Base '99 V70?


Thanks!

41-45 psi for a non turbo, 54-57 for a turbo

Thank you!

Mine is a non-turbo.

Also, what should it be with the car not running and the key on - or doesn't that really matter?

Just ran my pressure tester.

When I turn on the key, with no engine, I get about 10 psi.

When I start the engine, I'm running a consistent 24 psi.

Obviously this is far too little pressure.

So here are my next questions:
1. Is there a fuel pressure regulator on this car? It has only 1 line running to the fuel rail, and there is a fuel damper on the fuel rail. But that damper is NOT a regulator, is it?

2. Is the culprit likely my fuel pump?

3. Could this low fuel rail pressure be causing me to have a P0171 Code coming up (lean bank 1)?

1-No, the pump regulates the pressure.

2- Yes, but a clogged fuel filter can cause this as well.

3- Yes. Lean can be too much air or not enough fuel.

Thank you for your response!

I did change the fuel filter this summer - about 2500 miles ago - so, considering the size of that bugger, I seriously doubt that there's a problem with it.

Also, it is common for the fuel pump in these Volvos to be working, but not producing the pressure it should?


If I do (and it sounds like I will) replace the pump, do you have any suggestions regarding brand, part number, etc.?

Yeah if the filter has been changed, that's not your problem.

I wouldn't say common, but yes, I have seen a few with this problem.

I'm a dealer tech, so I only have experience with OEM parts. I couldn't give you an honest review of any aftermarket ones.

I"m running an E8643 from Autozone. Same one would fit your car too. It was actually a Walbro pump in an Airtex box. Runs great and more than enough for a stock engine. I chose it as it should be enough form my car when I go to a bigger turbo and ARD tune. Already running bigger injectors and E85 mix. Autozone or Oreilly about 130 and 1 yr warranty.
I would also check out FCP to see if theirs would have a lifetime warranty if installed by an ASE tech and you were going to be hanging on to yours for a while.

http://contentinfo.autozone.com/znet...E8643/image/3/

Thank you, Kiss4aFrog!

I know these Volvos can be extremely fussy about replacement parts, so I've assumed that the lower priced fuel pumps should probably be avoided.

I get a lot of parts from RockAuto, and the pump you linked is right at $100 through them. That's a LOT better to think about than $500+ for a Volvo pump! :)

Just ordered the AirTex E8643 from RockAuto. Total, with shipping, is right at $105. Strainer included. And it comes with a limited lifetime warranty - so that puts my mind at ease.

Thank you!

Final update:

Went to replace the fuel pump, and found that the 4" long rubber hose between the pump itself and the assembly "top" had 2 tiny little slits in it. Under any amount of pressure they'd leak.

So I replaced the rubber hose with 3/8" fuel line & new clamps, reassembled everything, and all is well.

48 psi on the fuel rail, the car runs great, no CEL, and I'm sending the new fuel pump back to RockAuto.


Sometimes you get lucky!

Life is good.

Did you make sure to ask for fuel injection line ?? Was it about six bucks a foot ??

Unfortunately no, I didn't. I used some high-end fuel line I already had.

I will most definitely keep an eye that - maybe even just pop the fuel pump out & replace the line again some time this summer (read, during WARM weather!). :)


You know... You mentioning that makes me wonder if the guys who put the new fuel pump in (about 25k ago) didn't use the right fuel line - and that's why it began to leak?