I have a pressure guage attached to the rail, when the key is turned on I hear the pump prime and the fuel pressure only goes up to a little above 20psi and falls off, back to zero as soon as I turn the key to the off position.
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sounds like the pump and the check valve in it are weak, or you have a leak somewhere. A severely leaky injector could cause this, but I'd expect saturated plugs. Leaky fuel line would cause this as well, but that should be obvious with the fuel leaking out from someplace. Check the tops of the injectors too, a ripped O ring will cause you trouble.
Under normal conditions, it should prime up close to 30 psi, and hold pressure for a while. It will bleed off slowly, but I'd expect at least a half hour before its back down to zero. Does it come up to normal pressure with the engine running? 30-35 with vacuum on the regulator, 40-45 without vacuum.86 Lincoln Town Car (Galactica).
5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley
91 Lincoln Mark VII LSC grandpa spec white and cranberry
1984 Lincoln Continental TurboDiesel - rolls coal
Originally posted by phayzer5
I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers -
its at 38 with car running with vac hose on. i also pulled all the plugs and they were good clean no black on them and no smell of gas.Comment
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if it starts and runs normally, and gives you normal pressure then don't worry about it.86 Lincoln Town Car (Galactica).
5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley
91 Lincoln Mark VII LSC grandpa spec white and cranberry
1984 Lincoln Continental TurboDiesel - rolls coal
Originally posted by phayzer5
I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousersComment
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it starts normal but dosent run normal when i give it gas it like bogs downComment
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if its holding normal fuel pressure when running, thats probably not the issue. Check it for codes, it may have a dead TPS or something.86 Lincoln Town Car (Galactica).
5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley
91 Lincoln Mark VII LSC grandpa spec white and cranberry
1984 Lincoln Continental TurboDiesel - rolls coal
Originally posted by phayzer5
I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousersComment
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Perhaps the regulator is going south. In my case, it was the fuel pump that went bad. Though I had only 20 psi with the car running.
On the same note, what's the fuel pressure on the return side of the fuel system?
PackmanComment
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