p0087 fuel rail pressure to low - Ford Powerstroke Diesel Forum
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Old 12-11-2010, 09:12 AM
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p0087 fuel rail pressure to low

having this code wot on all tunes of superchips.you can watch the fuel pressure drop on the tuner when you get in the throttle.set it back to stockand not doing it on stock mode ill take any ideas thanks
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Old 12-11-2010, 10:49 AM
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HPFP getting weak?
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Old 12-12-2010, 03:37 PM
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check your fuel filters. Could be caused by leaking injectors also. Check your oil level/condition. See if its overfull or diluted. Easy way to check for dilution is take the oil dipstick and wipe it on a white paper towel/napkin. If it has fuel in it, it will make a light ring around the oil because it seperates. Could also be a biased FRP sensor. Check the sensor and all related wiring for it. As mentioned above, injection pump could be getting weak as well.
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Old 12-12-2010, 05:42 PM
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fuel filters need to be changed and fuel pressure taken at the low pressure pump outlet under the conditions the code is set. spec is 3-8 psi iirc

you also should do a high pressure bleed at the fuel cooler and see if the fuel is getting aerated somehow. like said before a high pressure leak can cause this, so can a bad frp or a sticking vcv in the hpfp

last one i fixed was a high pressure pump and cover gasket but you absolutely have to verify base fuel pressure
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Old 12-13-2010, 06:55 AM
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thanks for the info, i changed the fuel filiters, but ill look in the other possible problems
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