jschaefer7406 Posted June 30, 2009 Report Share Posted June 30, 2009 Hello all, I have a 2000 S70 AWD w/128k miles that has recently required a longer crank in the morning. Naturally, first thing I did was to check the residual fuel pressure. I watched the gauge for less than 10 minutes and saw it fall to 10 psi (from nearly 60). Now, I understand that this is my problem. What I don't know is what is the likely cause. I remember that the RWD cars had a replacable check valve in the line. What is the usual suspect for pressure bleed-off on these models? Searching is fruitless with this new lay-out, but I did read the thread on page two (reguarding the Walbro pump install and such). Anyone seen this on the early X70 ME7 cars? Please advise, Joe Link to comment Share on other sites More sharing options...
the commissar! Posted June 30, 2009 Report Share Posted June 30, 2009 seems like there is a check valve near the front of the car...if you follow the hard lines from the fuel rail over the top and down the back to the bottom of the engine compartment on passenger side, there is what I believe is the check valve you ask about... Link to comment Share on other sites More sharing options...
MrWinkey Posted July 1, 2009 Report Share Posted July 1, 2009 Hello all, I have a 2000 S70 AWD w/128k miles that has recently required a longer crank in the morning. Naturally, first thing I did was to check the residual fuel pressure. I watched the gauge for less than 10 minutes and saw it fall to 10 psi (from nearly 60). Now, I understand that this is my problem. What I don't know is what is the likely cause. I remember that the RWD cars had a replacable check valve in the line. What is the usual suspect for pressure bleed-off on these models? Searching is fruitless with this new lay-out, but I did read the thread on page two (reguarding the Walbro pump install and such). Anyone seen this on the early X70 ME7 cars? Please advise, Joe Com'on Joe I thought you were a Volvo certified master tech by your old signature? :( Link to comment Share on other sites More sharing options...
jschaefer7406 Posted July 1, 2009 Author Report Share Posted July 1, 2009 Com'on Joe I thought you were a Volvo certified master tech by your old signature? You got me there . But, believe it or not, I had never run into this at the dealer. Then again, I had never (that's right, not even once) replaced an angle gear there either, so we must have been a small dealership . I stood up for the AWD systems in previous posts and then had mine bite me in the end. So, 5 years as a Master tech doesn't always mean you've seen it all, just that you know it all . In any case, I know what the problem is, just don't know for sure what the component location is that's causing it. I have gathered that the check valve is built into the pump unit (infinite wisdom there, especially considering the grief that's required to remove the pump; also that the check valve isn't available separately). Some say to check the regulator, but as we know, ME7 cars only have a damper on the fuel rail (no regulator). Can't see how that would cause bleed-off. I am considering adding a separate check valve near the filter, but not sure how to splice it in without butchering the lines (I loathe hack-jobs ). Anyway, that's what I'm thinking. Anyone here done this? Joe Link to comment Share on other sites More sharing options...
rbodor3 Posted July 1, 2009 Report Share Posted July 1, 2009 haven't done it, but am thinking along the same lines as you with the same issue. Removing the FP assembly is such a PITA, and also knowing that the assembly I'm putting in has the same fail rate as the one I'm removing I'd rather put in my own check valve. Haven't done a ton of research into it yet but if I figure something out before you do I'll let you know. Link to comment Share on other sites More sharing options...
rbodor3 Posted July 1, 2009 Report Share Posted July 1, 2009 Anybody sure if our fuel systems are circulating? Because if they are a reteurnless system I don't believe a check valve could be installed into the fuel line. Link to comment Share on other sites More sharing options...
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