4000 diesel issues

[New Mexico]

My diesel will start and run for about a half hour and then acts like it runs out of fuel. Do they have a vented cap or vent tube that could be blocked?

 

[SkipperII]

Or the small screen on the fuel shut off valve, in the tank is plugging from sediment in the tank. If it's the cap, you can check it by loosening the cap,

 

[Destroked 450]

You can loosen the cap to see if it helps, if not start chasing fuel flow

 

[Sean in PA]

Always best to say whether it is a 3 or 4 cylinder 4000. How long does it have to sit before it will start and run again?

 

[New Mexico]

It is a 3 cylinder diesel. I have replaced the injector pump with a new one , replaced the injectors, cleaned the fuel tank and replaced fuel filter.

 

[showcrop]

It is a 3 cylinder diesel. I have replaced the injector pump with a new one , replaced the injectors, cleaned the fuel tank and replaced fuel filter.

With all these new parts it leaves the most likely cause is that it is sucking air until it has sucked enough that the injector pump doesn't have enough to pressurize.

 

[New Mexico]

Ok It go thru and retighten.

 

[shaun wallace]

Do not know what brand fuel filter was used. How many of the big square section orings were left over ?

 

[New Mexico]

Napa fuel filter , one o-ring around bottom of housing one o-ring in top of housing

 

[New Mexico]

Napa fuel filter , one o-ring around bottom of housing one o-ring in top of housing

Do not know what brand fuel filter was used. How many of the big square section orings were left over ?

Napa filter with new o-rings one on top one on bottom

 

[Destroked 450]

Napa fuel filter , one o-ring around bottom of housing one o-ring in top of housing

On Wix and NAPA filter if the top o-ring was installed like in the photo that is your issue

 

[New Mexico]

My oring goes into the housing not into the filter

 

[New Mexico]

Napa filter with new o-rings one on top one on bottom

There were two left over gaskets

 

[Destroked 450]

That’s the way they are all supposed to be, but you’d be surprised how many mistakenly place the o-ring inside the lip of the filter

 

[SkipperII]

I wonder if your low pressure lift pump is going bad, or maybe has a pin hole in the diaphram. It doesn't happen very often, but it does happen.

 

[Destroked 450]

I wonder if your low pressure lift pump is going bad, or maybe has a pin hole in the diaphram. It doesn't happen very often, but it does happen.

4000’s CAV inj pump has a small vane transfer pump built into the back of the pump, there is no external lift pump on that model

 

[New Mexico]

I’ve gotten down to its rust coming from the tank clogging the outlet. I’ve just received the new tank and will be installing it

 

[showcrop]

I’ve gotten down to its rust coming from the tank clogging the outlet. I’ve just received the new tank and will be installing it

Congratulations! Thanks for posting back. Don't worry. You are far from the first who had it turn out to be the most basic simplest thing after replacing a lot of parts.