Subject	ash spec dual fuel pump controller issues/danger
Posted by	DarkZide on December 09, 2012 at 2:41 PM
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Message	I figured I would post this up since I have a little free time today. Well to keep it short, Rays Z was running the Ash spec fuel pump controller with the dual wallbro pumps and we had it on the dyno last summer just playing with the boost controller and some race gas. At around 600+hp we started getting a lean condition over 5000rpms. we started checking fuel pressure first and after trying to adjust it up a little, the pressure dropped off to 24psi and would not raise back up at all. So I limped it back to our shop and began trouble shooting. Greg and Seb from speacialty Z have been telling us for a while this setup up was not good with the fuel pumps and ash controller and I got to see why first hand. The stock wiring is not ment to handle the load of 2 high flow pumps. so it basicly over loaded the system and cooked the wires. we were lucky it didn't melt all the way and start a fire. here are some picks I took of the burnt electrical stuff. His setup Fuel pump wires in tank to one of the pumps were hard and melted. 2 pins on right are + and - fuel pump harness plug pins melted. female side of the plug burnt. I work with low voltage wiring for my job every day. Here is the main issue with this set up. The harness coming from the body harness running to the fuel pump itself is 18awg wire. 18 gauge wire is rated at 10amps. Here is a chart showing the draw of 1 walbro 255 pump. [ [ http://www.roadraceengineering.com/fuelpumpflowrates.htm ] ] So at 14 volts each pump is drawing over 10amps. This will cause the wire to get supper heated and eventually melt and fail/start on fire. We ended up installing 2 stealth 340 pumps in place of the walbro's. I also replaced the the connectors and upgraded the harness wire to 12 gauge. I also installed a hobs switch with a separate relay and wiring to run the second pump. We had no further problems with this set up running the car over 800whp. "Speed costs money. How fast can you afford to go". -DarkZide
Follow Ups	ash spec dual fuel pump controller issues/danger - DarkZide 14:41:31 12/09/12 What was Ash's feedback on the failure? (n/m) - samsung-Z [Houston] 14:50:13 12/09/12 well Ray the cars owner emailed him or Z1 - DarkZide 15:39:01 12/09/12 that could have potentially caused an explosion (n/m) - WhiTTe Z 16:11:18 12/09/12 that could have potentially caused an explosion (n/m) - WhiTTe Z 15:47:37 12/10/12 that could have potentially caused an explosion (n/m) - WhiTTe Z 16:56:46 12/11/12 If the wiring was the issue, curious why you didn't - Jayru 15:03:49 12/09/12 after discussing this with the guys at Spec Z we decided - DarkZide 15:42:00 12/09/12 I'm confused - Jayru 17:15:58 12/09/12 sorry for the confusion here is what I did - DarkZide 17:26:26 12/09/12 whoa (n/m) - LJZTT 15:05:52 12/09/12 You need to rewire with #10 wire, the existing wire can't - njz 15:44:57 12/09/12 it looks like the pigtails that came with the pumps - aliaZ 17:28:21 12/09/12 Who soldered the two hot wires to the stock connection? - RZturbo 17:41:53 12/09/12 details please? - aliaZ 17:55:25 12/09/12 Yeah thats how it was before, I change that set up as well - DarkZide 18:51:01 12/09/12 I forget exactly how I worked around this but I think I - The Devils Z 18:30:34 12/09/12 Yeah the way I have it only one pump runs at idle - DarkZide 19:08:58 12/09/12 Re: Yeah the way I have it only one pump runs at idle - WazTTed 05:17:22 12/10/12 Re: I forget exactly how I worked around this but I think I - ouikikazz 14:00:09 12/10/12 there is an unused pin on the ashspec controller - aliaZ 07:04:00 12/12/12 so why does ash not put this in his install instructions? (n/m) - DarkZide 11:37:06 12/12/12 good question - aliaZ 17:49:23 12/13/12 I think I just upgraded the ground wire and had no issues. (n/m) - toykoz32 12:19:22 12/11/12 Interested in doing a write up for us? (n/m) - KongZTT GT28RS MD 21:25:07 12/09/12 possibly, I would rather do a write up when I install the - DarkZide 21:56:00 12/09/12 sounds good man - KongZTT GT28RS MD 22:10:27 12/09/12
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