Erikv11 I agree fully. I am sorry that it came across not clearly about pulling the injectors from the fuel rail. I meant about pulling them from the head. At the fuel rail, of course one needs to take off the bracket first, held on by 4 screws, I cannot remember either Philips or star-head. Somehow ...

Ashlee, just pull hard. The injectors are held in the fuel rail and the engine buy the seal on the "o" rings.
A little wiggle sometimes helps. Also, you cannot use the old "o" rings with new ones. There will be a pressure differential and the old ones might leak.

When putting on new "o"rings use ...

Injector_Volvo_0280155968_Bosch_injector_Volvo_9202100.jpg 61DtPtSXCpL._SL1500_.jpg ashlee, I do not understand. Did they come cracked? The "o" rings should be a soft pliable rubber ring which fits around the recess on the lower end and the upper end of the injector. It appears to me that if the ...

That should be right. Just check to see if it is compatible for the 1999 S70. You do not need the cap only the spacer and the "o" rings. Since you seem to have change the upper rings you only need to change out the lower set.

A word of caution, on most of the kits the lower spacer does not attach ...

It appears you only replaced the upper "O"rings. There is another lower set and then the lower seals. You need to take out the injectors to get at them.

Welcome to the club. I looked around for a full month to find my P0172 code vacuum leak, to no avail.
After listening to a hissing sound I narrowed it to a fuel injector. Pulled all the injectors and found 3 of them to have cracked or broken lower end seals. Replaced the lower hard spacers seals and ...

Thank you. I just have a standard OBDII scanner so.... But I will keep those measurements in my volvo folder for future reference. My car does not seem to have any signs of a deteriorating MAF. I have and K&N air filter and every 10,000 miles I spray the MAF with CRC contact cleaner to keep the oil ...

jpr0204, thank you. I after spending a few hours looking for a dropped seal, which I finally found and than a dropped bolt which I didn't,(bought a new one), I put everything back together and the car actually runs quite smoothly. Better than before. The check engine light is off since I ...

Misha, well the FPR is not at the back wheel. Only the the roll-over valve.

The fuel pressure damper is on the fuel rail as I have pulled the fuel rail apart to get at the injectors. Will replace the seals and rings on the injectors, hopefully today and put the car together. BTW the volvo ...

By the Way Misha, this is what my Fuel Pressure Relay looks like. It is quite different from the picture you have posted previously.