GTV6 and 75 Twin Spark Fuel Pump

[shane wescott]

Quick one guys.

Do the GTV6 and the 75 Twin spark share the same fuel pump/filter.

Thanks

Shane

[MD]

I am expecting that they would . I would also think the 75,90, V6's would too. The 164 pump should have more capacity but would do the job too if your regulator is ok.

However if you are looking for a cheap pump with grunt, try one from a Volvo 240 series wreck.

[Storm_X]

i think the v6 pump is thw same as a vl turbo

[shane wescott]

Thanks MD. My father in law has a 740 so I might nick it while he is not looking.

Looking at the manual it mentions a pump also inside the petrol tank. The RACV guy asked me this last night - yes I have nothing better to do than chat to RACV dudes at 01:00 am :-(

I said i didnt know.

I think a quick swap tonight from 75 to gtv6 may be in order. I do want to drive to the transaxle workshop rather than ride a Honda.

Catch ya

Shane

[bt46]

Hi shane. There is a pick up pump in the tank. You should be able to hear it woking. If you want a cheap external pump go to pick a part and grab one off a vl conformadoor (or vn ect ect i think) .

[MD]

Ha hhaa, the VL also has a good lift pump in the tank..

[dehne]

the vl turbo pump is the same and cheaper (parts dealers???) ive been running one in my 90 for 3 years now and its works great

[Typhoon90]

The Volvo guys replace the in tank pump with a Walbro when upgrading and delete the high pressure pump near the filter, just one high pressure pump in tank. No reliability issues and it's good for 300+hp.
http://forums.turbobricks.com/showthread.php?t=7685

Regards, Andrew.

[Storm_X]

walbro intank pump is much better then a bosch as it has a longer pick up

[MD]

It is worth knowing that in principle, pumps do much better at pushing then they are pulling ie they blow a lot better than suck. What that translate into is that it is best to place the pump much closer to the stuff being pumped than where it is being pumped to.

In terms of fuel systems, the above princples are applied by installing a lift pump in the tank where it is sucking the fuel up at the closest possible point and then pushing it up the line to a much higher pressure pump that is designed for doing just that. In tank pumps are pain when they fail (and they will).

The simplest solution is a gravity fed high pressure pump. This way if the pump does break down, it is easily serviced.

[VeeSix]

Hello Shane
I know the GTV6 and 75 3.0 V6s all share the same pump and they have only one underneath the rear door, which side depends on the model, and they have no pump inside the fuel tank.
Thankyou VeeSix

[bt46]

Veesix dont confuse the poor man lol
There is a low pressure lift pump inside the tank on all injected alfetta based cars as well as the high pressure pump under the car.

[VeeSix]

No, not all of them, boot mounted tanks in GTV6 and 75 3.0 have no internal pump. 

[Typhoon90]

 The in tank pumps, where they exist, should be properly called lift pumps. Their job is purely to ensure the high pressure pump under the car does not see a vacuum in it's feed line. This will cause the pump to cavitate, which is no good for fuel pressure and pressure pump life. This is also the reason the pressure pump goes shortly after the un noticed failure of the lift pump, usually signalled by poor engine performance for weeks/months leading up to the pressure pump failing, as the driver has ignored the hard starts, poor idle/performance issues caused by the cavitating pressure pump.
Of course, if the fuel supply is above the pressure pump, you don't need a lift pump as gravity and weight of fuel is doing the job for us.

Regards, Andrew.