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finding the FPR vaccuum hose 700

posted by  Andy Berry on  Sat Mar 21 14:47 CST 2015
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last visit: Sat Jul 12 13:10 CST 2014
[RELATED]

i saw this in the FAQ section and would like to try it, but can someone tell me exactly which hose it is and where to find it? thanks

1992 volvo 740 4-cyl nonturbo

"[Diagnosis 5:] The fuel pressure regulator is worth a careful inspection. The fuel pressure must rise instantly in response to the vacuum signal fall that accompanies a throttle opening. A hardened diaphragm might be causing the fuel pressure that has been lessened by the fuel pressure regulator to not increase as rapidly as it must and you won't get the appropriate fuel quantity in spite of lengthened injector duration. Try an acceleration test with the vacuum hose pulled off fuel pressure regulator. Easiest way to check the FPR is to pull the vacuum hose off of it while the engine is idling. If the idle picks up, your FPR is good."






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