How to run the fuel pump without starting?

[UrS4boy]

You don't need to jumper all three... Remove relay 10 in the main fusebox and bridge terminals 48 and 52 - these map to terminals 30 and 87 on the relay - this then runs the fuel pump.

Even easier, at least with an UrS4. You just remove the fuel pump fuse (which is AFTER the FP relay on a C4) and apply + power to the downstream (the one closest to the back of the car) fuse terminal (which is No. 17 on an UrS4/6)

[speeding-g60]

FWIW, on the relay, 30 is power in, always connected to the 87A. when the coil of the relay is hit with opposing polarity (prob 85 and 86 in this case) then it switches the 30 output to 87.

follow?

typical Bosch style relay.

85 coil pole A
86 coil pole b
30 input
87A output from 30 when not energizing the coil
87 output from 30 while energizing the coil with opposite polarity.

[sam80quattro]

or pull the cover off the relay and push the contacts together

[lind4hl]

[mcandmar]

why not start the car on the axle stands? (if it stands correct ofcourse) that is an easy way and this is how i do to check leaks..

How did you know it was on axle stands, is this something all avant owners do

[S2central.net]

Ahhh recent info is better - I've been looking at these darned wiring diagrams a LOT recently... The other terminal just provides switched power to other engine components. That 87 pin is just for the fuel pump.

[Jas11n]

You don't need to jumper all three...

He he I wondered why bridging three terminals too, but was following an old post of yours when I checked my fuel filter for leaks the other week.
It worked so

[lind4hl]

Problem is i cant get the cover off in the boot as the screws have rusted to hell, would have to drill them out. Looking for somewhere more accessible

oh, unusual...
why not start the car on the axle stands? (if it stands correct ofcourse) that is an easy way and this is how i do to check leaks..

[mcandmar]

Perfect, thanks guys

[S2central.net]

You don't need to jumper all three...

Remove relay 10 in the main fusebox and bridge terminals 48 and 52 - these map to terminals 30 and 87 on the relay - this then runs the fuel pump.

[mcandmar]

Or, remove fuel pump relay in the fusebox (marked 208 on top, front row fourth from the left) and bridge terminals 30, 87 and 87a.

That sounds more like it, do you know what the three pins are? or why you jumper all three?

If i can find out which sends + power to the pump i can plug some juice into it.

Thanks,

Mark.

[Jas11n]

Or, remove fuel pump relay in the fusebox (marked 208 on top, front row fourth from the left) and bridge terminals 30, 87 and 87a.

[mcandmar]

Problem is i cant get the cover off in the boot as the screws have rusted to hell, would have to drill them out. Looking for somewhere more accessible

[Rocco]

take an cable from the battery to + on the pump??

+1

[robert_n]

take an cable from the battery to + on the pump??

my thoughts too...