Fuel Pump Issue With Bosch 040

[dori34]

Hi guys, having a issue atm with a bosch 040 pump i installed today.

i've read the tutorial thread on installing it and its exactly the same.

problem is that first 5-10minutes of driving was beautiful. now when i give it, it just cuts out, if i rev it slowly and keep it longer it does not cut out.

any help guys?

the priming sound on idle does not sound right either, need to know whether its a faulty pump or not because the guy i bought it off assured me its in 100% working condition.

here is a video of the sound on idle.

http://yfrog.us/5fvideo0003e1z

any help much appreciated!

[dori34]

also not sure if this helps but i have a nismo fuel reg that has been adjusted to suit the GTR pump. would this affect anything with the new pump?

[Crans]

Have you hard wired the pump to the battery?

[dori34]

no, its connected as it would be as a normal pump.

are you suppose to?

i followed all info in this thread & none said to do so.

http://www.skylinesaustralia.com/forums/To...mp-t253097.html

[Crans]

Bigger pump will draw more from the electrical system. The stock wiring may not be enough to supply its needs.

Wire directly to the battery using a relay and the stock wire as a trigger

[dori34]

yeah ive heard of that being done in older cars, 32,s13 etc

but other people with 33 GTST & 34 GTT, S14/15 dont do this and they dont have any problems.

i cant be bothered stuffing around anymore, im just gonna sell the pump and get a walbro.

its heaps noisey so it gets annoying as well

cheers for ur help crans

[RBceffy25]

The stock stuff is absolutely not enough to cut it.

I have just been through this with a Walbro, which shit itself then replaced it with Bosch 040 running at 13.3-13.45 volts @ Idle. FAAARRKEN NOISY! but it does its job : )

Standard voltage was something like 11.0 volts @ idle.

You have to remember that these aftermarket pumps 'alleged' power rating (e.g. Walbro is claimed to be 255lph, 500hp pump) is only relevant when running at full volts/potential. So when it runs at below this, like mine was, I think from memory the rating for the walbro dropped to something like 190lph. Pathetic.

So regardless of what everyone else states, including some manufacturers/distributers etc, You must re-wire, as stated above.

On a sides note, I am certain this all has something to do with nissan having it wired like this as to reduce pump noise but this may only apply to GTR's.

Please, anyone, correct me if im wrong here.