Question about 1984 Porsche 928

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1984 928 will only start with prime

Car has been setting for 1year fuel pump does not turn on car is standard

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Id be inclined to believe that if vehicle has been sitting for a year with fuel left in it then you will probably have to clean/overhaul or replace the entire fuel system as fuel does not age well it turns acidic and destroys and melts all its left soaking in.Sorry its not good news but there you are.Have you taken the fuel filler cap off to see if the fuel smells stale.Even if you fill the tank with fresh fuel the damage is already done.Good luck and hope its not as serious

Posted on Nov 20, 2008

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How to prime a toyota 3.4 efi motor


the fuel pump should get the fuel up to the injectors. do you hear it click on and buzz when you turn key to start. check owners manual and find the fuse to the fuel pump and make sure it is good.you should not need to prime the fuel injection. also you may have a cloged fuel filter.check fuel at the fuel rail with engine off and cold... if fuel there it will spary, so be careful. if no fuel at the rail then check fuel pump ... good luck

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When my fuel pump didn't turn on, my truck wouldn't start, if it did turn on it started right up. I replaced the fuel pump and it starts every time, but the fuel pump doesn't turn on every time. Is...


the fuel pump don't turn on every time . first when the pump as prime or if system is prime the pump will not turn on
the PCM give a ground to fuel pump relay for 2 sec and while the engine is cranking the pump is running all the time.
but pcm don't prime each time

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you should not have to prime the fuel pump. just install it and turn your ignition key to the start position. You may have to turn the ignition key several times but once it starts, the car should start normally after that.

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Hello! Change the Fuel Pump Relay...The prime contacts are defective..They are single pole double throw and normally closed for several seconds to prime the pump and then swing open applying battery to the fuel pump on the normally open side...The chatter is that set of contacts not breaking free from their normally closed position...The result is a unprimed fuel pump (which you are priming with gas into the throttle body....That plus the noise...Guru...saailer

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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

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Where is the fuel cutoff switch located for 1998 nissan pathfinder


Reseting the fuel pump kill switch.

Before you reset the fuel pump, make sure to read all of the following instructions!!!!!

            • MAKE SURE YOU HAVE GAS IN YOUR TANK! IF IT IS EMPTY, THE FUEL PUMP MIGHT NOT NEED TO BE RESET, IT ****** ****** MIGHT ONLY NEED TO BE PRIMED, PUT AT LEAST TWO GALLONS IN THE TANK AND SKIP TO "Step 4". ******

1.) Look for an access panel in the trunk, driver's side; it might even be labeled "Fuel Pump Reset".

2.) Open the compartment and press the red button. This should reset the pump.

3.) At this point it might be a good idea to "burp" the fuel tank. This will probably be the easiest thing you do all day! Just pop the cover and unscrew the gas cap, this will release any preasure built up inside the tank. As long as you're in a controled environment, go ahead and leave the cap open until you finish "Step 4". Otherwise "burp" it a couple of times while you're priming the lines.

4.) The next step is to prime the pump. In other words, make sure there is enough gas in the fuel lines to start the car. The easiest way to do this is by turning the key back and forth from the "OFF" to the "ON" position. *** Be sure not to turn all the way to the "START" position until you have performed "Step 4", at least 3 or 4 times. If you attempt to start the car before the fuel pump is properly primed, you will run a serious risk of burning out the pump. This could lead to even more costly repairs!!!

5.) Replace the gas cap before attempting ignition.

6.) Once you have reset the pump, burped the tank, primed the fuel lines, and replaced the gas cap; you should be all set! Go ahead and give it a crank, good luck!!!!!!!!!!!!!!!!

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2 Answers

Wont start, checked the fuse, cant seem to locate fuel filter.


Turn the key to the ON position without starting the car
You should hear the fuel pump running for 5 seconds to prime the fuel up to the engine so it can start. If no sound is coming from the fuel tank area which can be heard with the drivers door opened in a quite area the oil sending unit on the engine needs to be looked at. If its bad the fuel pump will not prime. If the oil sending unit is good the fuel pump is at fault instead
Oil pressure to your engine achieves to close the circuit to this switch which the computer senses. When the oil pressure is up to normal standards the PCM shuts that circuit off and turns on the fuel pump relay

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2 Answers

Where is my fuel pump at? on a 1995 chevy camero 3.4 yes ran the car out of gas put so in wont start now what should i do first


Your fuel pump is in the tank. Turn on the ignition, and listen if you can hear the pump run in the tank. It will only run a few seconds if the engine is not running. You can repeat this several times to prime the fuel injection.

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1 Answer

1996 tahoe wont start


There should be a 2 second prime by the fuel pump. This prime by the fuel pump is standard for GM vehicles, and if it is not present a hard start is encountered. Turn the ignition to the run position and listen for the fuel pump operation. You may have to have an assistant listen at the fuel filler by installing a long slender funnel into the fuel inlet to the tank, remove the gas cap and insert the funnel, listen at the large end of the funnel to see if the pump can be heard running. Using the funnel acts like a megaphone and makes it easier to hear the pump. If the pump runs for 2 seconds after you turn the key to the run position (DO NOT attempt to start the engine during this test) and the engine doesn't start due to lack of fuel, check for an obstructed fuel filter. (Just change it, it's probably overdue for service anyway since everyone thinks it get changed during oil changes, but never really does.) If the pump doesn't run during prime interval, the computer may not be turning on the fuel pump relay, or the relay is defective. To check the relay, use another of the relays in the power distribution box to substitute for the suspect fuel pump relay and retest. Be sure to wait at least 30 seconds between key cycles since some systems have a delay timer built in to keep the pump from over running. Be sure the relay you sub into the fuel pump socket is identical to the one you remove and properly oriented in the socket. The engine will run following your manual prime because an additional set of contacts in the oil pressure switch will power up the fuel pump relay once proper oil pressure is achieved by an idling engine. If you find that the relay is not defective, but doesn't provide a priming impulse, the engine computer may have failed. DO NOT use a conventional test light with a filament type bulb to check any of the computer circuits that drive the fuel pump relay, or any other computer controlled circuits on an automobile ( or pickup) The driver circuits in a vehicle computer can be blow-out by over-current when using a conventional test light. You can use a high-impedance DVOM for testing safely.

Nov 01, 2008 | Chevrolet Tahoe Cars & Trucks

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