VE vs. In-Line fuel pump for Patrol TD42

I know the VE or rotary type uses the fuel as a coolant and a lot of it is returned to tank. This is why you'll probably notice the fuel filters on a VE type are bigger. An advantage of this is that your fuel is constantly being filtered and returned to tank.

Chris,
In line pumps are very old technology, early GQs with the TD42 engine used to have them until the new VE rotary type came along.
Main difference is that the rotary pumps are smaller, quieter, faster, more precise and take less HP to run.
Rotary pumps use the fuel as coolant and as lubricant, they have a built in lift pump (they bring the fuel from the tank as well as into the engine and some back to the tank).
In line has a camshaft which pushes the pistons, the camshaft area is separate from the top section and engine oil pressure lubricates the pump (athough some of the use their own oil), there is also a separate lift pump which brings the fuel from the tank to the pump itself.
These pumps are very simple and other than the governor and automatic advance there is nothing else to go wrong.
In line pumps are not so much affected by bad fuel and water (not to the same extent) as the rotary types.
That's it in a nutshell with many many different types of in line and rotary.
In line pumps are still being used today in some trucks.
Will

As pointed out, the VE type injection pump (which on Jap vehicles tends to actually be a VP) is usually electronically controlled these days (for both power and emissions reasons).

Generally these types of diesel injection systems are being displaced by common rail diesel injection systems, which are completely under computer control (as in your Jeep). Common rail systems further enhance power and emmisions reductions. Many medium size trucks are now common rail too.

Water is the enemy of all diesel injection systems, due to the fine tolerances of the pump and diesel fuel lubriaction in the VE/VP type pumps. Check the filter (or bowl as appropriate on other vehicles) every service, and when ever you have to get fuel from unknown suppliers. The trick here is to get fuel from the truck pumps (the pump with the big nozzle on the end of the hose) at high turn over locations. They also fill at a decent rate, specially if you are putting in 150litres or more.

Dave

-TEK
Diesel Engine Performance Centre

Hi Guys,
Yes Whitworths or Bias Boating Marine sell the Lucas/CAV type set ups - both outlets are in competition and will always match the other stores prices so if you know the costs it allows you to go to the closest outlest.

Regards,
Ian