Koenig-Specials 928

I recently converted to the 044 ext pump and strainer. Yesterday the car died suddenly on the highway. I have a fuel gauge installed and because it read zero I knew immediately that it was the fuel pump. I always carry tools in my car (I have like a doctor's bag from Husky with tools and a voltmeter). After doing the usual, nothing worked. To go to the end of this story, the last thing I checked was the new 40 amp relay for the pump. I jumpered the new relay and immediately the pump ran.

Because of the fuel pressure gauge and the location of the new relay (behind the tool kit) and a prepared jumper for the relay I was up and running in under 15 mins. P.S. This is info for new owners

Question: Now that I have a second relay, can I leave the one on the fuse panel (normal one) permanently jumpered?

Thanks

WallyP

That depends - is the new one controlled by the same signal as the original? Does it cut the pump off if the engine stops running?

If not, then it is not safe to jumper the original.

AO

So which relay died? The one at the CE panel or the remote one? Sounds like the remote one.

If you jumper the CE panel FP relay, you will be energizing the remote relay and turning on the pump. So, no, don't do this. The CE FP relay acts like a remote switching unit that is tied to the ignition.

Koenig-Specials 928

It was the new (remote) relay that failed. This is my set up for the remote relay. The signal to close the coil on the remote relay obviously comes from the CE Panel relay, so yes, if I bridge that to the battery the remote relay will be always energized ( I'm a little slow today but now I see the light). Thanks.




I just hate depending on two relays for the same pump.

Alan

Well the stock relay now switches almost no load so it will be much more reliable as a result.

The only way to eliminate the stock relay is to use its coil connection on your new relay - these are fed from Ignition (15) and on the ground side the switched ground from the LH ECU. You curently have just a single wire from that relay and you'd need one more to make this work.

I'd just leave the relay in there. In fact if it were me (and I'm contemplating the 044 pump) I think I'd just get a better relay (higher switching rating) in the stock location.

Alan

Glenn M

Alan,
Will the stock wiring won't have an issue with higher current draw of the 044 pump? Wire gauge didn't seem very large, maybe 18 or 20?

What relay would you use? May be a good idea to switch it out even with the stock pump as it seems to be a problem unless is is a carbon buildup issue with the relay.

Thanks,

Koenig-Specials 928

Thanks Alan. I have 40 amps in both locations now. I will leave well alone.

I remember many moons ago a member here had, as part of his signature, "If it ain't broke, fix it till it is". I guess i was about to do just that.

dprantl

I have asked this question before and there were several people running the 044 pump with stock wiring and stock relay. Also, since I now have an in-tank pump and will be using a strainer instead, that is that much less load on the stock wiring.

Dan
'91 928GT S/C 475hp/460lb.ft

Alan

I'm also presuming going from a dual pump to a single 044 w/ strainer.

The wiring on my GTS is 2.5 mm^2 from the relay which is actually pretty good - no problem with that. Its only 2.0MM^2 on the ground side - but that is a short run.

Alan