How to install a fuel inline check valve, 00 V70

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falconbrother
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Year and Model: V70, 2000
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How to install a fuel inline check valve, 00 V70

Postby falconbrother » Thu Apr 28, 2011 8:56 pm

If you have a hard start issue it very well may be a bad check valve in the fuel pump. If you think that this is you go on-line and order a 5/16 in-line fuel check valve.

The fuel line runs out of the in-tank pump, down the right rear wheel well to the fuel filter, then under a plastic cover to the firewall. I placed my check valve under the car in a recess under the front passenger floor board where it's not likely to hit something in the roadway. You can place yours where you wish.

When you cut the fuel line you will notice that it has a rubber outer and a nylon inner hose. Cut out about an inch or slightly more of line. Carefully trim the rubber outer off of the fuel line leaving exposed about a half inch of the nylon line. Do this on both sides. Be careful. A sharp razor will slice right through the nylon like butter so be careful.

In the check valve kit there is a check valve with two brass ends. Leave the ends off for now and make sure that the body of the valve is tight and secure. Slide each on the exposed nylon line and then insert the white nylon compression seal over the nylon hose. Place the check valve body in the cut out section and finger tighten each side. Make sure that the compression seal has been inserted so that the cone end is facing out towards the cap on each end and ensure that the one way check valve body arrow is facing the front of the car. Now get a 5/8 and a 3/4 open end wrench and tighten each end being careful not to over tighten. Get it good and snug but don't strip out the brass threads. Now, take the mounting clip and place it around the body of the check valve. Pick a drill bit that's the size of the self tapping screw just under the threads (so they have metal to bite). Drill a hole so that the clip will hold the check valve securely. Insert and tighten the screw.

Check for leaks. You're done.
2000 V70
1992 940
1989 740
1979 242GT

falconbrother
Posts: 90
Joined: Mon Mar 29, 2010 11:58 pm
Year and Model: V70, 2000
Location: NC

Re: How to install a fuel inline check valve, 00 V70

Postby falconbrother » Sun May 01, 2011 2:13 am

Here's a picture.
Attachments
check valve.jpg
2000 V70
1992 940
1989 740
1979 242GT

falconbrother
Posts: 90
Joined: Mon Mar 29, 2010 11:58 pm
Year and Model: V70, 2000
Location: NC

Re: How to install a fuel inline check valve, 00 V70

Postby falconbrother » Thu May 26, 2011 3:14 am

Update: Use caution with this repair, especially if your car uses Volvo part number: 1275658 for the fuel pressure regulator/damper/absorber (it's known by all three names).

In hot weather the check valve may cause excessive temperature related pressure to build up in the fuel line at the fuel rail and damage the fuel pressure damper. According to Volvo service a hard start condition, related to decreased fuel pressure on the rail, is more likely related to leakage inside of the fuel pressure damper than to a faulty fuel rail. According to Volvo service, failure of either part is rare but, the damper fails more often than the fuel pump check valve. If there is a problem with any part of the fuel system fix that rather than adding parts to the original design, per Volvo.
2000 V70
1992 940
1989 740
1979 242GT

shiloh51933
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Re: How to install a fuel inline check valve, 00 V70

Postby shiloh51933 » Thu Nov 24, 2011 7:37 pm

falconbrother wrote:Here's a picture.



Since you've introduced this after market check valve into your fuel system have you had any issues as mentioned in the later post? I'm having hard starting issue due to fuel pressure loss after turning engine off. I checked the pressure with a fuel pressure gauge and she drops to 0 immediatly after turn off engine. You mentioned the damper being possible issue, have you looked into that possibility?
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mrjacobrussell
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Re: How to install a fuel inline check valve, 00 V70

Postby mrjacobrussell » Fri Jun 01, 2012 6:39 am

I was considering doing this modification as a work around until I can schedule time to take off the tank and swap the pump.

I used a pressure tester to watch the pressure at the rail , it was perfect during engine running, but dropped to zero when I turned off the car .

Have you had any problems with this modification ??
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JRL
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Re: How to install a fuel inline check valve, 00 V70

Postby JRL » Fri Jun 01, 2012 2:29 pm

Listen, since I was the person who found this fix and posted it a few years ago, we have fine tuned our installation
You mount it directly behind the fuel filter (which you should buy a new one BTW). Butt it right to the back of the filter
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mrjacobrussell
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Location: Southern Oregon

Re: How to install a fuel inline check valve, 00 V70

Postby mrjacobrussell » Fri Jun 01, 2012 4:36 pm

JRL wrote:Listen, since I was the person who found this fix and posted it a few years ago, we have fine tuned our installation
You mount it directly behind the fuel filter (which you should buy a new one BTW). Butt it right to the back of the filter



Do you have any pictures ?

Your saying mount between the filter and the tank correct ?
2000 V70 XC SE Wifeys car
2001 XC70 Daily Driver
1998 V70 R
1988 240 DL
I have a Chinese DICE, works well.

1994 Volvo 850 SOLD

jonl
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Re: How to install a fuel inline check valve, 00 V70

Postby jonl » Thu Jun 21, 2012 3:55 pm

JRL,
What's accomplished when you install the CV behind the fuel filter?
Thanks a bunch,
Jon
2000 V70XC with 185k

daviddstubbs
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Re: How to install a fuel inline check valve, 00 V70

Postby daviddstubbs » Thu Aug 16, 2012 6:52 am

Where the heck does one find a fuel-rated check valve like this? Lots of air valves, but this bit seems rare, at least to Google.

Is there an opening pressure, e.g., 5 PSI, to look for?

What barrel (inside) diameter , e.g., 5/16, or is that some other dimension?

Thanks very much for the clues about installation!

David Stubbs
Portland, Oregon, US

rspi
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Re: How to install a fuel inline check valve, 00 V70

Postby rspi » Thu Aug 16, 2012 2:56 pm

I always thought the fuel pressure regulator kept pressure on the system. I also thought the fuel filter had it's own check value.
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