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Power Strokes
7.3 Aftermarket
Fuel Pressure Drop
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[QUOTE="IHPowerstroke7.3, post: 1282962, member: 7642"] Spent some time with the truck today, talked with Dennis from Strictly and discussed my findings with him. Think we figured it out. Injectors are a Full Force stage 1, 160cc stock nozzle as per customer. Stock pump should not have a problem supplying them. Dennis had me verify some things. Checked power to the pump, its within 300 millivolts of battery voltage. Also asked me to check how much fuel the pump would push out the fuel drain on a couple key cycles. Compared to my stock 7.3, customers truck would flow almost a whole quart more than my truck would (my original 120k mile pump) on 2 key cycles. Logged data, In the tune he brought it to me with (say its a hot tune) WOT in 3rd, 3200 rpm, mass fuel desired was 100mg, pulse width was 4.6-4.8 ms, ICP would hold between 2800-3300, IPR duty cycle was 44% from what I remember. Fuel pressure would drop from 60 to 40 psi. Went to his tow tune, WOT in 3rd 3200 rpm, mass fuel desired was only 76-80mg, pulse width max I saw was 3.6 ms, ICP and IPR was the same. Fuel Pressure drop was 5-6 Psi max. So just as I figured from the get go, too much fuel in that tune for the pump to handle. Asked the customer if he switched tunes, says it was the same in all tunes. Should have checked for myself, but didn't have time to go play around last week. Going to go to dual sd pumps and re evaluate. Thank you to everyone for the help. Forgot to add, I'm assuming you mean where am I measuring fuel pressure? At the fuelab regulator port. Customer had auto meter gauge. I hooked up a mechanical gauge today to confirm the readings were accurate. Both gauges read within 1 psi. [/QUOTE]
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