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How to install a fuel inline check valve, 00 V70

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
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How to install a fuel inline check valve, 00 V70

Postby falconbrother » 28 Apr 2011, 20:56

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

Postby falconbrother » 01 May 2011, 02:13

Here's a picture.
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Re: How to install a fuel inline check valve, 00 V70

Postby falconbrother » 26 May 2011, 03:14

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

Postby shiloh51933 » 24 Nov 2011, 19:37

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

Postby mrjacobrussell » 01 Jun 2012, 06:39

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

Postby JRL » 01 Jun 2012, 14:29

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

Postby mrjacobrussell » 01 Jun 2012, 16:36

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

Postby jonl » 21 Jun 2012, 15:55

JRL,
What's accomplished when you install the CV behind the fuel filter?
Thanks,
Jon
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Re: How to install a fuel inline check valve, 00 V70

Postby daviddstubbs » 16 Aug 2012, 06:52

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!

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

Postby rspi » 16 Aug 2012, 14:56

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

Postby aauser » 23 Oct 2012, 03:43

When you say to "mount it directly behind the fuel filter ...Butt it right to the back of the filter" what is behind? which side is the back? Do you install the CV on the side of the line from the gas tank to the filter or on the side of the line from the filter to the engine? I don't want to put the valve where it will cause overpressure. Regards.
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Re: How to install a fuel inline check valve, 00 V70

Postby aauser » 21 Dec 2012, 23:17

Install was relatively easy. Installed the cv on a new fuel filter. Took 1hour to remove the f&@xing rusted retaining bolt. Had to trim the edge of the cv in order for the compression nut to fit. Didn't help the hard start though. Starter died few weeks later. Replaced starter. Car now starts 1st try. Yeaaay.
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Re: How to install a fuel inline check valve, 00 V70

Postby cn90 » 22 Dec 2012, 03:17

I am not sure this mod is necessary as most fuel pumps (Bosch included) have a built-in check valve already.
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Re: How to install a fuel inline check valve, 00 V70

Postby shiloh51933 » 31 Dec 2012, 16:35

cn90 wrote:I am not sure this mod is necessary as most fuel pumps (Bosch included) have a built-in check valve already.

Only necessary if you don't want to spend money on a new FP.
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