Question about 1991 Volvo 740

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What is the location of the fuel pump relay and solenoid valve(overpressure switch)? Which of these is more likely to cause car to cut off while driving and not restart for nearly an hour?

Temporary power loss to fuel pump.

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Behing the ash tray. You are looking for rectangular relay on the left side. The first relay (on the left side) is a window relay. The one behind it is the fuel pump. The one behind it is circular (bulb failure sensor).

Posted on Aug 22, 2008

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16795/P0411/001041


if (window.showTocToggle) { var tocShowText = "show"; var tocHideText = "hide"; showTocToggle(); } 16795/P0411/001041 - Secondary Air Injection System: Incorrect Flow Detected Possible Symptoms
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Cutting off while driving


Try checking fuel pressure again with a guage on the fuel rail. If you still notice the pressure is low and you know the fuel pump is good, the fuel pressure regulator may be bad. Sometimes you can tell by unplugging the vacuum hose from it and if you see gas that means the diaphram is leaking. If everything checks out with the fuel system a bad EGR valve or EGR valve solenoid can cause cars to sort of stall under half throttle. Good luck and keep me posted. If you found this helpful please rate this solution.

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