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The Terminator
Engine/Tuning
Pumps won't cycle off???
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<blockquote data-quote="turbov6joe" data-source="post: 15077566" data-attributes="member: 95661"><p>Of course:</p><p></p><p>twin GT supercar pumps</p><p>Fore Hat</p><p>80's</p><p>KB BAP</p><p>Dual FPDM's </p><p>Hotwired from battery to a relay, then out to the loop.</p><p>I'm using a premade dual FPDM harness</p><p></p><p>The wires going to the pumps are seeing 13.3v. The FP duty cycle on the Xcall 3 is saying .05???</p><p>I've swapped out 4 FPDM's, 3 FRPS, and a new FRPS I bought today just to be sure. The idle FP is 60-62 psi with the line on, and ~50-52 psi with the line off (the line draws 20" of vacuum). When I unplug the FRPS the rail jumped up to 77 psi. I took the BAP off line and that didn't change anything. I'm hearing that there is likely a ground issue causing the pumps to run full boogie at idle....they drop to 11v with key on, motor off. What else could control the fuel pressure? I even dropped the stock tune back in just to be certain...nothing. There has got to be so wire issue, I just can't seem to find it. SO....I pumped out a full tank of e85 today and am going to drop the tank to look things over. I fee like it's something dumb because t hasn't always been an issue...it started about 2 months ago off and on.</p></blockquote><p></p>
[QUOTE="turbov6joe, post: 15077566, member: 95661"] Of course: twin GT supercar pumps Fore Hat 80's KB BAP Dual FPDM's Hotwired from battery to a relay, then out to the loop. I'm using a premade dual FPDM harness The wires going to the pumps are seeing 13.3v. The FP duty cycle on the Xcall 3 is saying .05??? I've swapped out 4 FPDM's, 3 FRPS, and a new FRPS I bought today just to be sure. The idle FP is 60-62 psi with the line on, and ~50-52 psi with the line off (the line draws 20" of vacuum). When I unplug the FRPS the rail jumped up to 77 psi. I took the BAP off line and that didn't change anything. I'm hearing that there is likely a ground issue causing the pumps to run full boogie at idle....they drop to 11v with key on, motor off. What else could control the fuel pressure? I even dropped the stock tune back in just to be certain...nothing. There has got to be so wire issue, I just can't seem to find it. SO....I pumped out a full tank of e85 today and am going to drop the tank to look things over. I fee like it's something dumb because t hasn't always been an issue...it started about 2 months ago off and on. [/QUOTE]
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Pumps won't cycle off???
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