Timemachines
Full Access Member
Whats a recommended fuel flow rating for a 7.3 idi turbo running a stock pump maxed and 20psi. Is 35gph at 5psi enough
Built 7.3 Idi Turbo fuel pump
- Thread starter Timemachines
- Start date
icanfixall
Official GMM hand model
Thats plenty of flow rate and the pressure is great. Are you taking this pressure reading before or after the filter? Its best after the filter.
Where are you getting the 20 psi from?
If your going 60 MPH and get 16 MPG, your burning 3.75 Gal per hour.
The 5 psi means nothing, except your supplying enough fuel to the IP to keep running at the above figures. You could run at 2 psi and that would still be enough, as long as the engine don't stumble at the above speed.
Timemachines
Full Access Member
20psi boost pressure. 5 psi after the filters supply pressure. On a 35gph lift pump. Feeding a stock injection pump turned all the way up.
icanfixall
Official GMM hand model
Your fine with this flow rate and line pressure after the filter.
mblaney
Full Access Member
If your truck burned 35 gallons in an hour you wouldn't be driving it!
fx4wannabe
Full Access Member
If I was burning 35 gph then I would be doing like 400 mph.
Irrelevant. The number that matters is peak fuel consumption. What is the GPH wide open at redline? That is what the pump needs to supply. I suspect for a IDI turbo it's somewhere in the ballpark of 15-20 GPH. 35 GPH is sufficient so long as it actually flows near that as installed. For comparison, a typical mild to moderate power level big block will burn around 25 GPH wide open.
what year 7.3? what turbo? how are you getting 20 psi?
Timemachines
Full Access Member
ok sounds good thanks guys
blast from the past.
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Good question brian.
still hunting gph for a stock 7.3 idi loaded.
looks like stock lift pump runs 30 gpm....
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Good question brian.
still hunting gph for a stock 7.3 idi loaded.
looks like stock lift pump runs 30 gpm....
For those reading this thread now, 35 gph is much much less than what is needed to fuel an even lightly modified IDI.
3 year old post, op is LONG gone..
I have been hunting gph flow rates for a 7.3 idit with no luck, looks like the mech pump was rated at 30 for the n\a eng.
The faccet is not cuttin it, I am hunting a replacement the carter is low,but diesel rated. the holly red is not rated but they do list diesel e pumps.
Brb.
I have been hunting gph flow rates for a 7.3 idit with no luck, looks like the mech pump was rated at 30 for the n\a eng.
The faccet is not cuttin it, I am hunting a replacement the carter is low,but diesel rated. the holly red is not rated but they do list diesel e pumps.
Brb.
Macrobb
Full Access Member
The problem is that most of the fuel going through the IP is returned to the tank - quite a lot ends up used for lubrication and cooling of the IP.
Part of the problem of the electric pumps, is that you need to find one that can output a large number of GPH at a given pressure. Not, say, 5 PSI max, 35GPH(at zero back pressure).
Mechanical pumps run faster with higher RPM, so the size of the pump can be less. They also can produce quite a bit of force, not limited by a small amount of electrical power.
Personally, I don't see the problem with the stock mechanical pump - if one can handle a RD2-110 at full throttle and still push 3.5 PSI(with 4.5 PSI at idle), that's more than enough for any smaller IDI.
Add a primer pump if you want, after the mechanical pump, just make sure it can "flow through".
Part of the problem of the electric pumps, is that you need to find one that can output a large number of GPH at a given pressure. Not, say, 5 PSI max, 35GPH(at zero back pressure).
Mechanical pumps run faster with higher RPM, so the size of the pump can be less. They also can produce quite a bit of force, not limited by a small amount of electrical power.
Personally, I don't see the problem with the stock mechanical pump - if one can handle a RD2-110 at full throttle and still push 3.5 PSI(with 4.5 PSI at idle), that's more than enough for any smaller IDI.
Add a primer pump if you want, after the mechanical pump, just make sure it can "flow through".
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