Fuel pressure problems please help
Thread Starter
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Freshman User
Joined: Jul 2015
Posts: 29
Likes: 0
From: Cleburne, TX
Fuel pressure problems please help
This is a little but I'm trying to make sure I covered what I've done at this point.
I have a 1991 F250 7.3 IDI non turbo diesel and I went from the mechanical fuel pump to electric fuel pump using a Carter P4601HP when I turn on the ignition without starting it builds up to 8PSI after I start it drops to near zero and idles rough I also mounted a Carter P74019 fuel pump and got the pressure up to 12PSI after doing this and it idled great after I took it out on the road for a test run the pressure dropped to near zero again and the idle got rough again, once I idle it up with the throttle it levels out but pressure still stays at near zero, here's how I have it hooked up.
Coming from the selector valve to a filter then to the carter fuel pump P4601HP to a check valve all with 3/8" tubing hooked back into the steel line going to the mechanical pump where the steel line normally hooks to the mechanical pump that's disconnected and a 3/8" hose ran to the filter.
Note: I disconnected the Carter P74019 thinking maybe this was restricting the flow, (grasping for straws)
Thanks Patrick
I have a 1991 F250 7.3 IDI non turbo diesel and I went from the mechanical fuel pump to electric fuel pump using a Carter P4601HP when I turn on the ignition without starting it builds up to 8PSI after I start it drops to near zero and idles rough I also mounted a Carter P74019 fuel pump and got the pressure up to 12PSI after doing this and it idled great after I took it out on the road for a test run the pressure dropped to near zero again and the idle got rough again, once I idle it up with the throttle it levels out but pressure still stays at near zero, here's how I have it hooked up.
Coming from the selector valve to a filter then to the carter fuel pump P4601HP to a check valve all with 3/8" tubing hooked back into the steel line going to the mechanical pump where the steel line normally hooks to the mechanical pump that's disconnected and a 3/8" hose ran to the filter.
Note: I disconnected the Carter P74019 thinking maybe this was restricting the flow, (grasping for straws)
Thanks Patrick
Methanoholic
Joined: Mar 2009
Posts: 6,442
Likes: 8
From: Maine (NorCal Native)
Sounds like an issue on the suction side ...
Like it's sucking air or sucking lines/filters flat.
Unhook the output on the Carter and run it into a jug, what happens?
It should pump the tank dry with a solid stream ...
Personally, I prefer the mechanical pump.
-Enjoy
fh : )_~
Like it's sucking air or sucking lines/filters flat.
Unhook the output on the Carter and run it into a jug, what happens?
It should pump the tank dry with a solid stream ...
Personally, I prefer the mechanical pump.
-Enjoy
fh : )_~
Thread Starter
|
Freshman User
Joined: Jul 2015
Posts: 29
Likes: 0
From: Cleburne, TX
Sounds like an issue on the suction side ...
Like it's sucking air or sucking lines/filters flat.
Unhook the output on the Carter and run it into a jug, what happens?
It should pump the tank dry with a solid stream ...
Personally, I prefer the mechanical pump.
-Enjoy
fh : )_~
Like it's sucking air or sucking lines/filters flat.
Unhook the output on the Carter and run it into a jug, what happens?
It should pump the tank dry with a solid stream ...
Personally, I prefer the mechanical pump.
-Enjoy
fh : )_~
Do you mind me asking why you prefer mechanical over electric
Methanoholic
Joined: Mar 2009
Posts: 6,442
Likes: 8
From: Maine (NorCal Native)
Nope, Don't mind at all ... If you've ever seen a electric pump fueled fire, you'll understand.
I assure you, It's not pretty watching/smelling humans burn ...
I know, not me, it'll never happen, I don't plan on getting into an accident!
That's what we all say ... Until it's to late!
Modern electric pumped vehicles have some sort of fuel shutoff safety, when folks convert manual pumps to electric they RARELY do it correctly, thus in an accident the fuel pump continues to run and fuel the fire!
Safety shutoffs are an added cost and headache.
Not to mention they are cheaper and last just as long if not longer than most electrics.
-Enjoy
fh : )_~
I assure you, It's not pretty watching/smelling humans burn ...
I know, not me, it'll never happen, I don't plan on getting into an accident!
That's what we all say ... Until it's to late!
Modern electric pumped vehicles have some sort of fuel shutoff safety, when folks convert manual pumps to electric they RARELY do it correctly, thus in an accident the fuel pump continues to run and fuel the fire!
Safety shutoffs are an added cost and headache.
Not to mention they are cheaper and last just as long if not longer than most electrics.
-Enjoy
fh : )_~
Thread Starter
|
Freshman User
Joined: Jul 2015
Posts: 29
Likes: 0
From: Cleburne, TX
Nope, Don't mind at all ... If you've ever seen a electric pump fueled fire, you'll understand.
I assure you, It's not pretty watching/smelling humans burn ...
I know, not me, it'll never happen, I don't plan on getting into an accident!
That's what we all say ... Until it's to late!
Modern electric pumped vehicles have some sort of fuel shutoff safety, when folks convert manual pumps to electric they RARELY do it correctly, thus in an accident the fuel pump continues to run and fuel the fire!
Safety shutoffs are an added cost and headache.
Not to mention they are cheaper and last just as long if not longer than most electrics.
-Enjoy
fh : )_~
I assure you, It's not pretty watching/smelling humans burn ...
I know, not me, it'll never happen, I don't plan on getting into an accident!
That's what we all say ... Until it's to late!
Modern electric pumped vehicles have some sort of fuel shutoff safety, when folks convert manual pumps to electric they RARELY do it correctly, thus in an accident the fuel pump continues to run and fuel the fire!
Safety shutoffs are an added cost and headache.
Not to mention they are cheaper and last just as long if not longer than most electrics.
-Enjoy
fh : )_~
Thanks for the wake/up kick in seat end
Patrick
Thread Starter
|
Freshman User
Joined: Jul 2015
Posts: 29
Likes: 0
From: Cleburne, TX
Nope, Don't mind at all ... If you've ever seen a electric pump fueled fire, you'll understand.
I assure you, It's not pretty watching/smelling humans burn ...
I know, not me, it'll never happen, I don't plan on getting into an accident!
That's what we all say ... Until it's to late!
Modern electric pumped vehicles have some sort of fuel shutoff safety, when folks convert manual pumps to electric they RARELY do it correctly, thus in an accident the fuel pump continues to run and fuel the fire!
Safety shutoffs are an added cost and headache.
Not to mention they are cheaper and last just as long if not longer than most electrics.
-Enjoy
fh : )_~
I assure you, It's not pretty watching/smelling humans burn ...
I know, not me, it'll never happen, I don't plan on getting into an accident!
That's what we all say ... Until it's to late!
Modern electric pumped vehicles have some sort of fuel shutoff safety, when folks convert manual pumps to electric they RARELY do it correctly, thus in an accident the fuel pump continues to run and fuel the fire!
Safety shutoffs are an added cost and headache.
Not to mention they are cheaper and last just as long if not longer than most electrics.
-Enjoy
fh : )_~
Patrick
Methanoholic
Joined: Mar 2009
Posts: 6,442
Likes: 8
From: Maine (NorCal Native)
I wouldn't consider that an issue to worry about, oil pressure switches work fine if the motor loses oil pressure ... What's to say it's going too!
But then a manual pump is no better either!
In fact, in a case like that, an electric with inertia switch is safer.
From a safety point I think they (both) should have several safeties.
From an owner/mechanic stand point I don't want any of them headaches!
So, IMO the lessor of two evils is the manual.
If a person wanted to deal with an inertia switch, I've been told Ford Escort switches are good simple ones to use ... Cheap at the salvage yard as well.
EDIT
It's cool, you know how memories are, they never leave!
-Enjoy
fh : )_~
But then a manual pump is no better either!
In fact, in a case like that, an electric with inertia switch is safer.
From a safety point I think they (both) should have several safeties.
From an owner/mechanic stand point I don't want any of them headaches!
So, IMO the lessor of two evils is the manual.
If a person wanted to deal with an inertia switch, I've been told Ford Escort switches are good simple ones to use ... Cheap at the salvage yard as well.
EDIT
It's cool, you know how memories are, they never leave!
-Enjoy
fh : )_~
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i ain't rite
Joined: Mar 2005
Posts: 65,422
Likes: 5,507
From: Marlboro Mental Hospital.
the oil pressure switch on an electric pump will not cause an issue with air intrusion. the injector pump is strong enough to draw fuel through the electric pump if the pump should fail while running. i have never had an issue with air intrusion or starting with the oil pressure switch.
i do have a momentary contact bypass wired in the circuit, but i only use it to fill the fuel filter after changing it.
i think the larger issue is in the pump of choice. the carter is a good pump for gas engines, but for diesel engines the only one worth using is the facet duralift.
i do have a momentary contact bypass wired in the circuit, but i only use it to fill the fuel filter after changing it.
i think the larger issue is in the pump of choice. the carter is a good pump for gas engines, but for diesel engines the only one worth using is the facet duralift.
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