4.2 fuel transfer pump or just injection pump

[John Shimp]

Got myself in trouble, here. I do BMW vintage work and took on this leaking injector pump on my son's 1992 Land Cruiser 4.2L diesel with Denso 710 pump. Took end off injection pump, on the vehicle to replace oring and of course could not reassemble it without removing it. Did all that and reassembled. No fuel coming in fuel line from fuel filter. Is there an electric transfer pump in the tank, or does the injection pump do it all. Have searched online....need some help. Thanks!

 

[Shayne]

Theres a filter sock on the pickup in the fuel tank which can get blocked .

Might be worth pulling the return line off the tank and pushing compressed air into the tank via the filler cap as somebody cranks the engine .

Steel fuel pipes coming from tank are known to rot letting air in while showing no sign of a fuel leak .

 

[Grimbo]

No electric pump... just a hand primer on the filter .....
Get one of those lemon shaped pumps you see inline on the likes of Honda and Peugeot engines .... put it in the line before the filter and prime it up with one of the injector pipes loose.... when you get her running then just take the primer off and put it all back to stock and it should run fine

 

[John Shimp]

Theres a filter sock on the pickup in the fuel tank which can get blocked .

Might be worth pulling the return line off the tank and pushing compressed air into the tank via the filler cap as somebody cranks the engine .

Steel fuel pipes coming from tank are known to rot letting air in while showing no sign of a fuel leak .

Thank you!

 

[John Shimp]

No electric pump... just a hand primer on the filter .....
Get one of those lemon shaped pumps you see inline on the likes of Honda and Peugeot engines .... put it in the line before the filter and prime it up with one of the injector pipes loose.... when you get her running then just take the primer off and put it all back to stock and it should run fine

Ok, thank you. I tried filling the line to the injector pump with diesel fuel through a syringe thing, but no success. Maybe without your priming procedure it did not fill the pump?? It all started as a leak that I was pretty sure I could fix .....took off end with the lines and replaced that oring (hard to find, but got the correct one....and then I could not get it together, so I removed the pump and got everything on that end back in place....reinstalled and tried to start....but not fuel. That is why I thought there might be a pump in the tank.
I will try what you suggest...and am open to any other thoughts...now that you know "the rest of the story".

 

[Towpack]

If the primer doesn't work, rig up a temporary fuel supply with something like this and hang it above the IP.......

Fuel tank

....I made one from a plastic bottle when I ran a some injector cleaner through the engine.
It should start readily with the gravity fed fuel supply. If it still doesn't then the problem must be with the IP itself.

 

[John Shimp]

Thank you for the replies....an update is in order. I discovered that there is a primer built into the fuel filter housing...primed it and fuel leaked from the injection pump....sigh..... Back to the drawing board.