Question about 1998 Ford Windstar

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What are the symptoms of a bad fuel pump wont start unless primed

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Have you check fuses, relays etc, to make sure power getting to pump, or can you hear pump cycle ("hum") when key turned to on? (not start)

Posted on Jun 04, 2009

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In the morning the truck wont start unless you prime it with starting fluid, after that it starts all day until the next morning why?


Inside the fuel pump is a check valve to keep static fuel pressure in the fuel lines . When they go bad they allow the fuel to drain back into the tank . This can cause the problem your having. An it would also depend on the make ,model an year vehicle you have . The GM vortec engine with CPI fuel injection system ,if the fuel pump is weak you can have the same problem .

Sep 29, 2015 | Cars & Trucks

1 Answer

Why will my 1998 chevrolet cheyenne not start unless primed after sitting overnight


by primed are you supplying a fuel source if so then the car is not getting fuel to burn. this indicates your fuel pump is bad and needs replacing and change the fuel filter also. the reason the pump won`t work sitting overnight is that the pump can`t build up enough pressure possibly because the fuel pressure is not being held, but after the first start up the system can maintain enough pressure to start through out the day. you can have the fuel pressure and volume checked with a gage when the problem occours to verify.

Aug 25, 2014 | Cars & Trucks

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Diesel fuel system


Hello there , sounds like your fuel pressure is low , your fuel sensor may be faulty or your fuel pump is sucking air from between the pump a fuel tank .. Regards Graham ...

Apr 25, 2013 | 2006 Toyota Hilux 2.5

1 Answer

My 1997 blazer won't start unless primed in the throttle body it runs fine after when shut off for a day it needs primed again


This sounds like a fuel pump is starting to fail. The system is designed to keep, or at least prime rather quickly to allow for efficient starting. If the pump is begining to fail or, has a plugged fuel filter (which will kill a fuel pump), it may create this issue. One other item to check is the coolant temperature sensor. If it is reading warm when it is cold, this symptom will occur.

Jan 19, 2011 | 1997 Chevrolet Blazer

1 Answer

Wont start unless manually primed


Turn the ignition key to the ON position without starting the engine

You should hear the fuel pump priming for about a few seconds then shutting itself off.
If not hear replace the engine oil pressure switch
The 3rd wire to that switch is the pumps prime switch lead.
When the engines oil pressure is reached the computer will shut that circuit off and turn on the fuel pump relay
If you hear the pump prime the relay maybe at fault instead

Jan 19, 2011 | Chevrolet 1500 Cars & Trucks

1 Answer

Wont start after sitting a few days unless primed with gas in the carb. Replaced fuel pump and filter


primer pump in carb is bad it's easy to fix and will need to buy carb kit to get it all it is is a small rubber piece that helps pump gas into the carb good luck.

May 20, 2010 | 1979 Ford F 350

1 Answer

Silverado not starting unless prime


There is a check valve in the fuel pump that sounds like it may have gone bad. Check the fuel pressure at the shredder valve, there should be 60 to 65psi during the prime and will drop 5 psi when the engine is running. Once the fuel line is primed, check to see how fast you lose your prime. Since you replaced your injection system, we can eliminate the fuel pressure regulator leaking which was common on the injection system your truck run's on. If the fuel pressure drops fast then it's going to be a bad check valve at the fuel pump and it may be time to replace the fuel pump it self. Good luck and hope this helps. Note: do not try to start the engine with putting gas through the throttle body, it's been know for small fires to start and burn the spider injectors. 

Sep 04, 2009 | 1999 Chevrolet Silverado 1500

1 Answer

Could this be a cold start problem


defective fuel pump the check valve is allowing it to lose prime replace fuel pump.

May 28, 2009 | 1996 Chevrolet Blazer

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