The V8 Owners Forum -

Posted: **Mon Dec 26, 2011 8:54 pm**

Should i be using a check valve on a Bosch 044 Fuel Pump? Ime just on with putting the upgraded pump on, The old (Standard) Sytec pump didnt have one fitted, Ime using a 8mm barb fitting, Just a bit puzled

Thanks, Steve

Posted: **Mon Dec 26, 2011 10:10 pm**

I dont use one, mainly because my pump didn't come with one originally.
Just means your rail dosn't remain pressurised when off.

Posted: **Mon Dec 26, 2011 10:57 pm**

There is absolutely no need for a check valve.

Posted: **Tue Dec 27, 2011 1:00 am**

Thanks...

Posted: **Tue Dec 27, 2011 10:56 am**

i was not running one, but now i am
only difference i have found hot starting is a lot easier now.

Posted: **Tue Dec 27, 2011 11:12 am**

Coops the PIKEY wrote:i was not running one, but now i am
only difference i have found hot starting is a lot easier now.

Yes - there's a factory fit hot start mod on my SD1. Basically, above a certain radiator temperature, it shuts off a valve fitted to the fuel rail return, and bypasses the inline resistor. So the pump runs up to maximum pressure, while cranking.

Posted: **Tue Dec 27, 2011 5:31 pm**

Coops the PIKEY wrote:i was not running one, but now i am
only difference i have found hot starting is a lot easier now.

Thats an added bonus then, said valve was essential on the old Bosch K/KE Jetronic systems to stop fuel percolation

a left over device I feel from that system.

The V8 Owners Forum -

Bosch 044 Fuel Pump, Check valve or not

Bosch 044 Fuel Pump, Check valve or not