vw mk 2 golf underpower

[shahir]

hmm..if i want to know my pump delivering sufficient pressure without the test set..how can i do it?just know i jus tried to listen to the fuel pump..it sound the same..but i will look into it as my pump was the initial prob..thanks guy for the info..this forum really helping..

[h100vw]

You can do the delivery test. I forget the figures but you find the return line from the fuel distributor and fire it into something that you can use for measuring.

Jump the fuel pump relay and it should flow XYZ millilitres of fuel in ABC seconds. The real figures are in the Haynes manual, which I haven't got handy.

If the amount of fuel is below that specified then you may have a blocked line or bad pump. At that point you need to know the pressure.

Gavin

[86gti]

the flow test test relies on the voltage at the main pump..so low voltage at the pump means a bit less delivery...
see what sort of voltage you have at the pump between 10-12v is usuall...

run the return line into a measuring cup (mid sized) ....will find the line behind driver side strut tower with a screw on fitting...
run the pumps by putting a switch between the 2 main fuel pump relay pins (with a fuse inline) for 30 sec and turn off.

at 10v you should have around 350-380cm3
at 11v you should have around 500-520cm3
at 12v you should have around 650-670cm3

I know from my mk2....I had very good system pressure in that aswell, and a poor flow rate... but that wouldnt start at all...lol