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TD42 Fuel Pump Q ...

Tech Talk for Nissan owners.

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TD42 Fuel Pump Q ...

Post by Hobbz »

We have a little electrical problem with a rotary pump on a TD42, there are 2 magnetic valves, one on top of the pump and one on the back of it, we dont know if the one on top shall have power on start up only or always (engine running)
There is also a vacum? thingy on the side of the pump, where does it get it's vacum from ? There arent that many TD42´s around so we cant just look at another ... any help would be apriciated !
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Post by bazzle »

Back one is the fuel valve, power on with ignition.
Hose (I assume a Turbo diesel??) goes to pressurised inlet for aneroid.
2nd switch??

Bazzle
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Post by dumbdunce »

vacuum thingy is probably the idle up for the air conditioning? on the side of the pump, with a little adjusting screw on the back.

the electric thing on the top of the pump might be a tach sensor?
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Post by Daisy »

dumbdunce wrote: the electric thing on the top of the pump might be a tach sensor?
tacho sender is located near the water pump in front of the cam gears.
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Post by Hobbz »

Thanks so far .. ill post a picture a little later so you guys can se the electric valve on top of the pump ...
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Post by bazzle »

dumbdunce wrote:vacuum thingy is probably the idle up for the air conditioning? on the side of the pump, with a little adjusting screw on the back.

the electric thing on the top of the pump might be a tach sensor?
Agree with that.. doh

Gets vac from solenoid on top of firewall that gets it from brake line vac.

Bazzle
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Post by Hobbz »

Now i only need to know what the one with the red wire is for and when it should be activated ... :)
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Post by Woop »

Fuel cut-off solenoid.

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Post by bogged »

bazzle wrote:
dumbdunce wrote:vacuum thingy is probably the idle up for the air conditioning? on the side of the pump, with a little adjusting screw on the back.

the electric thing on the top of the pump might be a tach sensor?
Agree with that.. doh

Gets vac from solenoid on top of firewall that gets it from brake line vac.

Bazzle
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Post by Hobbz »

Fuel cut off solenoid ? okay so it should be shut off when you turn off the ign. and on when ign. is turned on ?
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Post by Daisy »

Hobbz wrote:Fuel cut off solenoid ? okay so it should be shut off when you turn off the ign. and on when ign. is turned on ?
without it... your car will continue to run even with the ignition off
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Post by Hobbz »

So both solenoids should be turned on and off with ign. ?
I feel like a complete idiot :lol:
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Post by Dzltec »

The solenoid on top is for providing a higher internal pressure when activated. This then gives more timing advance. Generally only used in cold start situations. Leave it diconnected. It wont do any harm. The one with the blue wire is your stop solenoid.
Is your vehicle a grey import?


Cheers
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Post by Hobbz »

Dzltec wrote:The solenoid on top is for providing a higher internal pressure when activated. This then gives more timing advance. Generally only used in cold start situations. Leave it diconnected. It wont do any harm. The one with the blue wire is your stop solenoid.
Is your vehicle a grey import?


Cheers
Thanks ;)
It is an European car, originally from DDR.. It was imported to Denmark last year and stripped for engine and gearbox. Now a friend of mine has bought it an sourced a new engine and gearbox for it, the old engine had a different diesel pump, so there is a little wiring to be done :)
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Post by DieselBoy »

Dzltec wrote:The solenoid on top is for providing a higher internal pressure when activated. This then gives more timing advance. Generally only used in cold start situations. Leave it diconnected. It wont do any harm. The one with the blue wire is your stop solenoid.
Is your vehicle a grey import?


Cheers
Scroll to the bottom of this page:
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Where were you when this thread was in full swing!!!!!

Thanks, you've helped me a great deal too, i wanted to know what all that crap was on mine that my oldmans didn't have. Any thoughts on the extra plumbing on the fuel filter???!!!
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Post by Dzltec »

Where do the fuel lines go to and from. It may be a damper of sorts. Without seeing more plumbing is hard to tell. Take some more pics for me.

Cheers
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Post by bazzle »

Dzltec wrote:Where do the fuel lines go to and from. It may be a damper of sorts. Without seeing more plumbing is hard to tell. Take some more pics for me.

Cheers
Fuel heater?

Bazzle
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