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Old 11-07-2010, 04:09 AM
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Question Fuel pressures

I put a 200 psi gauge on when I did the FPR shim mod but it varies quit a bit in pressure. Where do I need to put other gauges to check the different fuel pressures pre and post fuel pump. I think I might have a few weak injectors. Smokes a lot on cold starts. Thanks
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Old 11-07-2010, 09:29 AM
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it will vary a lot due to a cam shaft driven pump. putting a gauge before the pump is useless as its all suction to the mechanical pump. All of our OBS PSDs smoke a lot on start up so i wouldnt worry to much if it runs well
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Old 11-07-2010, 05:14 PM
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Doesn't run like I think it should. Gonna try to do some tuning this winter. Uses some oil too.
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Old 11-08-2010, 07:54 AM
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have you done the FPR mod?
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Old 11-08-2010, 08:00 AM
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What color is the smoke on start up? If it is really blueish white, then could be bad injector o-rings. IF just white, or black, then its fine. This could also explain oil loss, do you get oil drip in your driveway, could just be oil leaking from pan. Most do that after years of work, rough winters etc.
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Old 11-11-2010, 04:01 AM
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Ya I did, fuel pressures not my problem, went to ask my uncle where I needed to start checkin fuel. Never checked blow by so I did that before goin up there and Holy crap. There lies my problem just a wore out motor.
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Old 11-11-2010, 06:41 AM
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may just be injector o-rings. hopefully thats what it is anyway. what color is the fuel in the bowl? (assuming its run a while since the last filter change).
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Old 11-11-2010, 06:57 PM
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Its blueish white sorry didn't see that post this morning. I changed the fuel filter about 7000 miles ago not sure of the color. How hard is it to put new o rings in. Is there a way I can check the injectors myself or should i just take them somewhere to be pressure tested while im in there. Pretty sure there aren't any oil drips. how much oil would it use in 7000 miles or so if the o rings were the main problem. Thanks for the help maybe there is hope for her after all.
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Old 11-12-2010, 05:44 AM
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how much oil it would use is a dependent on o-ring damage. i would say pull the fuel filter without draining the bowl. in good light peer in there and observe the fuel color then drain and reinstall.

id say look at some injector videos or walkthroughs and see what you think, if its something your up for. in general, if you can replace glows, you can probably ring the injectors...
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Old 11-12-2010, 11:31 AM
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K thanks will try to do that today.
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