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1998 S70 Fuel pressure regulator - Bad Vacuum lines to FPR Topic is solved

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

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Re: 1998 S70 Fuel pressure regulator - Bad Vacuum lines to FPR

Post by abscate »

Im going to start a whole new thread on this addressing how this functions as well as sourcing replacements for this NLA part

There are several variations on this, with several part numbers.

If you old grey beards can link to good threads on this please put them in the new thread

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Re: 1998 S70 Fuel pressure regulator - Bad Vacuum lines to FPR

Post by matthew1 »

Scheduled for inclusion in the Volvo Repair Database VRD. I've got work to do on these.
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Re: 1998 S70 Fuel pressure regulator - Bad Vacuum lines to FPR

Post by michael8888 »

I haven't seen an oem or bosch fpr for my 98 on ebay in 6 months. however, after doing some research it seems the specs on the bosch 0280160574 which is the one in my 98 t5m is a 3.8bars fpr. The bosch 0280160575 is for 4bars. bosch does make 3.8bar fpr #0280160689. It is also a lot more expensive. 3.8bars = 55.11psi and 4bars = 58.01psi. the difference of 2.9psi to my understanding may not be an issue if you are running bigger injectors and if you need the addition flow rate at full throttle. however if my fuel pump is getting weak I may not get enough pressure at the fpr at all times or if I have a vacuum leak the fuel pump will be trying to keep the pressure up at idle.
my issue is the car idle speed drops to 400rpm and comes back to 900 when I come off the highway or stop at a light. I believe my issue my be the not be the fpr but the cam sensor or throttle position sensor. I leaning towards to cam sensor since its ohm and voltage test gave me mixed readings. plus the plastic at the connector is rather messed up.. I just need a warm day to through in the new one.
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