HI! Today I measured my pump voltage with engine idling and crap : it was 10V only! Imagine what will it be on boost... (allthough the AFR meter is indicating full rich on boost). I guess that I need to drive the pump with a separate line but what gauge wire is needed? Also what fuse and relay rating?I will use the existing line with the inertia switch to drive the relay so I would be ok. Thanks!

 

I'm sure someone on here posted a diagram and all the bits you need. Have a dig around in the search bar.

 

 

you can use a Single throw relay instead of a SPDT

10v at the pump is dangerous!

make sure you get a good earth point too, there's lots of rusty bits on cossie's - better still, earth back to the battery
28/030 cable should be OK, but dont quote me as wiring isnt my strong point

 

That's what I thought to do : driving the relay from the existing fuel pump line.
I can connect earth anywere because my car has no rust at all but I prefer to run it from the battery. I didn't know the cable rating since I don't know what current the 044 use when on boost (maybe 17 - 20amp?).
What a SPDT relay is?

 

http://www.the12volt.com/relays/relays.asp

 

I found that fuel pump relay was defective hence the 10V on the pump. After putting new relay the voltage on the pump was 12.5V. Finally I purchased 6mm2 wire with heavy duty contact relay(70 A) and 30 amp fuse and after installing the pump has 13,9V on idle! It is sounding a lot louder too but not excesively.

 

i would always recommend rewiring the fuel pump with a direct feed from the battery on any cosworth

 

whats the score with 044 wiring looms you can buy off ebay etc, any cop of just the same as doing it yourself??

 

just do it yourself, save yourself a fair bit

a monkey could do it to be honest

 

Yes as above don't waste money! It costed me 12 euro to do it and 1 hour work...

 

i used hooge guage wire on mine with a 70amp relay (bigger contacts) ... worth it tho had a voltage drop of approx .25v on full throttle didnt cost the earth either...

 

Where is the best place to buy automotive cable?

I went into Halfords and they only do mini rolls and want £7-£10 for them

f that!!