Question about 2006 Toyota Hilux 2.5

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Diesel fuel system

Engine will not start unless somebody pumps the prime pump at the filter housing while engine is being cranked over. then engine will run fine until it is turned off,even immediatley after turnng it off it wont start again until it is primed while cranking

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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 ...

Posted on Sep 19, 2013

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Posted on Jan 02, 2017

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SOURCE: fuel pump won't run unless engine is cranking, but won't start

Are you sure it's running when cranking? It should have come on when key turned on.
This is for camrys up to year '91. It may apply in your '95, also. Check the 7.5 amp ignition fuse and the 15 amp EFI fuse and the EFI main relay, all located in the fuse box next to your battery. There is also the circuit opening relay tied in to fuel pump operation. It is usually found under center of dash. It is usually not the problem, but it is part of the checks for fuel pump operation.
If your car has a " check connector" or "service connector" (also called a fuel pump check connector) under hood on driver's side near the firewall (a little 1 inch cube with a cap on it), then bridge terminals +B and Fp with a jumper wire. Turn key to on (don't start car). The pump should come on. Listen for fuel return noise from the fuel pressure regulator, and verify pressure in hose from the fuel filter. If nothing, check those fuses above. Here is how power runs to pump: Battery to 40 amp main fusible link-to 15 amp EFI fuse-to EFI main relay-to circuit opening relay-to fuel pump-to ground. Ignition switch and the computer (ECU) work the relays to pass power to pump. Hope this helps some, Randy. Good luck.

Posted on Nov 11, 2011

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How do i prime fuel system on vw touran engine 1.9 diesel 2003 code avq


I fit doesn't have a prime pump at the fuel filter. Crack open and injector line. Crank it over until fuel comes out. Tighten it up. It should start.

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Car has been sitting up and will not start now. It seems to not be getting gas and I do not know how to prime a fuel injection system. Any help appreciated.


There is only a few cars fitted with an ancient petrol injection system that needed any priming.

Diesel engines mostly need the injection system priming but petrol injection systems do not.

Lots of cars use a system where the fuel pump runs for a couple of seconds when the ignition is switched on and that is all the time it takes to prime the fuel system. After a couple of seconds the fuel pump switches off and waits to restart when the engine is cranked.

As priming the system takes only a couple of seconds some manufacturers don't bother with the brief priming run of the pump and just have the pump start when cranking.

Could be faulty supply, fuse, pump relay or the pump itself.
If the car is fitted with an immobiliser, perhaps that is the problem.

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How to prime the injectors and fuel rail after replacing the injectors?


Electromagnetic or electronic fuel injectors are self-priming and all that is needed is to crank the engine, though I believe on later systems the injectors are coded and will not work unless the ECU has been informed the codes have changed. I think this applies more to diesels than petrol engines but on such matters I am not expert...

Staying with diesels for a moment - new injectors on either engine would usually mean fitting a new fuel filter. Sometimes this would require the primary diesel circuit to be bled in order for the high pressure pump to work.
The amount of starter cranking required can be cut by leaving each injector pipe loose in turn until diesel is dribbling from it.

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IT will never go unless you bled the air out of the system. Find all the bleed screws and pump fuel out until you get solid fuel. Crack the injector line nuts and crank over until there is fuel drops appearing at each nut . retighten the nuts and then there is every possibility that the engine will start
AS an off side ---Diesels are compression ignition engines and that means that they compress the air to white hot and the fuel is then introduced into this air and ignites IF you spray anything into the air intake then this will ignite prematurely and blow the pistons back out of the sump.
Check that the electric stop solenoid is operational and diesels have to have a fast cranking speed so half flat batteries are a waste of time

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Hello and welcome. you will have to perform the bleed procedure using the fuel prime on the fuel filter housing. there is a pump on top of the fuel filter assembly, on the passenger side of engine.

Open the vent valve screw (1) by turning the screw counterclockwise several full turns.




Operate the priming pump (1) by repeatedly pumping until a small amount of fuel seeps from the vent valve. Allow the pump to fully return upward between pumps. When fuel is present, the filter is full of fuel and the system is primed.
Close the vent valve screw.

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My kia sedona will only start when i prime the diesel filter by hand, then it runs faultlessly as long as i need to. however, within five minutes of stopping the engine it will not start again on the...


Yes it could be the pump, but also it could be a leaking injector or a clogged up diesel filter.

If the injectors are leaking they will be sucking in air and forcing the fuel back to the tank,

you can pour water around each injector to see if any are bubbling. Get the fuel filter changed and have the system bled through before replacing the fuel pump. they are very expensive.

Hope this helps
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It sounds like you are talking about a diesel engine as gas engines are self priming. Lift pump or primer pump may be defective. Check for loose fittings or lines and damaged o-rings at filter housing. Sounds like you are sucking air somewhere.

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