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The Terminator
How-To
Return style wiring HOW TO allowing OE type fuel pump actuation
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<blockquote data-quote="MalcolmV8" data-source="post: 11445183" data-attributes="member: 8854"><p>Correct. There is a setting in the ECC your tuner can change the FPDM from returnless to return in which case the FPDM will keep the pumps or relay in this case on constantly instead of modulating. I actually loaded both my new return and my old returnless tunes on last night and did key on to see how it behaved. In my minimal testing in the garage both worked. However as you said one should get that value changed in the tune.</p><p></p><p></p><p></p><p>Yup, that's correct.</p><p></p><p></p><p></p><p>Yes I have a fused 8 gauge wire running from the battery to the trunk to supply my pumps. I have a single relay right now and don't really foresee changing that. It will be different for everyone but with my Walbro 400 lph pumps they use 12.57 amps at 40 PSI and 14.92 amps at 70 PSI which is probably more than I'll ever see. That's just barely touching the 30 amp mark combined and I have a 40 amp relay in there. I could split it and run dual 30 amp relays and have redundancy in that if one relay ever failed I'd at least be able to drive the car still out of boost and get home.</p></blockquote><p></p>
[QUOTE="MalcolmV8, post: 11445183, member: 8854"] Correct. There is a setting in the ECC your tuner can change the FPDM from returnless to return in which case the FPDM will keep the pumps or relay in this case on constantly instead of modulating. I actually loaded both my new return and my old returnless tunes on last night and did key on to see how it behaved. In my minimal testing in the garage both worked. However as you said one should get that value changed in the tune. Yup, that's correct. Yes I have a fused 8 gauge wire running from the battery to the trunk to supply my pumps. I have a single relay right now and don't really foresee changing that. It will be different for everyone but with my Walbro 400 lph pumps they use 12.57 amps at 40 PSI and 14.92 amps at 70 PSI which is probably more than I'll ever see. That's just barely touching the 30 amp mark combined and I have a 40 amp relay in there. I could split it and run dual 30 amp relays and have redundancy in that if one relay ever failed I'd at least be able to drive the car still out of boost and get home. [/QUOTE]
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How-To
Return style wiring HOW TO allowing OE type fuel pump actuation
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