Robert DeLaPlaza wrote at 2015-05-20 03:16:10
The fuel pump has a "Big" and a "small" nipples, the big one is the pump output to the fuel filter (and the engine), there the fuel splits, part of it goes to the engine and the other part returns to the tank through the "small" nipple and keeps the line pressure as the -pump assembly internal pressure regulator- "throttles" back the surplus fuel while it regulates the fuel pressure in the fuel line, at low engine RPM's more fuel returns, at high RPM's more fuel is used by the engine and less fuel returns to the tank.
Robert DeLaPlaza wrote at 2015-05-20 03:36:12
ALL this plastic fuel pump assemblies with their two plastic nipples, it seems like the formulation of the plastics they use is no very resistant to the ethanol gasoline formulations and plastic hardens and gets VERY BRITTLE, that means, BE EXTRA - BUT VERRRY VERY GENTLE - when disconnecting the fuel lines from the pump nipples or you may break one or both plastic nipples.
That will mean a NEW PUMP ASSEMBLY has to be purchased and those don't come cheap, on my 1999 Caravan the assembly is $ 299.00 plus tax at the local Autozone and about the same price at other auto parts stores in town. you may be able to buy it a lot cheaper (plus shipping and waiting for it) through the internet.
Worst of ALL is that you will be throwing away a perfectly good fuel pump just because of those broken plastic nipples.
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