got 28 psi on fuel pump with code 43
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Joined: Aug 2002
Posts: 9,172
Likes: 7
From: somewhere in MI
Re: got 28 psi on fuel pump with code 43
Where did you check the fuel pressure? Depending on where you checked, before or after the fuel filter, it could be faulty fuel pump or it could be a clog in the fuel system like in the fuel filter for example.
I'm guessing the car starts but it doesn't run well? My brother-in-laws car had a similar problem, the car would start but as soon as he touched the gas pedal it died. We checked the fuel pressure and the fuel pump was only building something like 14psi and as soon as the pump stopped priming the pressure would bleed out immediately.
The fuel pressure should build to something probably around ~50psi, I don't know the spec off the top of my head, and hold pressure without loosing much more than ~5psi for ~5 minutes after the pump has stopped priming. If it doesn't build pressure it could be a clog in the system or a weak pump and if it builds pressure but bleeds off too fast then it's either an external leak from a fuel line or the fuel pump could be bleeding pressure back into the tank.
I'm guessing the car starts but it doesn't run well? My brother-in-laws car had a similar problem, the car would start but as soon as he touched the gas pedal it died. We checked the fuel pressure and the fuel pump was only building something like 14psi and as soon as the pump stopped priming the pressure would bleed out immediately.
The fuel pressure should build to something probably around ~50psi, I don't know the spec off the top of my head, and hold pressure without loosing much more than ~5psi for ~5 minutes after the pump has stopped priming. If it doesn't build pressure it could be a clog in the system or a weak pump and if it builds pressure but bleeds off too fast then it's either an external leak from a fuel line or the fuel pump could be bleeding pressure back into the tank.
Honda-Tech Member
Joined: Mar 2007
Posts: 11,399
Likes: 69
From: East Coast 506, Canada
Re: got 28 psi on fuel pump with code 43
x2
Or it could be the fuel pressure regulator as well
Specs @ idle
With the fuel pressure regulator vacuum hose connected = 30-73psi
With the fuel pressure regulator vacuum hose disconnected & pinched = 38-46psi
A 28psi fuel pressure reading is low and probably causing a lean condition. (code 43)
Or it could be the fuel pressure regulator as well
Specs @ idle
With the fuel pressure regulator vacuum hose connected = 30-73psi
With the fuel pressure regulator vacuum hose disconnected & pinched = 38-46psi
A 28psi fuel pressure reading is low and probably causing a lean condition. (code 43)
Thread Starter
Honda-Tech Member
Joined: Nov 2008
Posts: 79
Likes: 0
From: sacramento, ca, usa
Re: got 28 psi on fuel pump with code 43
Where did you check the fuel pressure? Depending on where you checked, before or after the fuel filter, it could be faulty fuel pump or it could be a clog in the fuel system like in the fuel filter for example.
I'm guessing the car starts but it doesn't run well? My brother-in-laws car had a similar problem, the car would start but as soon as he touched the gas pedal it died. We checked the fuel pressure and the fuel pump was only building something like 14psi and as soon as the pump stopped priming the pressure would bleed out immediately.
The fuel pressure should build to something probably around ~50psi, I don't know the spec off the top of my head, and hold pressure without loosing much more than ~5psi for ~5 minutes after the pump has stopped priming. If it doesn't build pressure it could be a clog in the system or a weak pump and if it builds pressure but bleeds off too fast then it's either an external leak from a fuel line or the fuel pump could be bleeding pressure back into the tank.
I'm guessing the car starts but it doesn't run well? My brother-in-laws car had a similar problem, the car would start but as soon as he touched the gas pedal it died. We checked the fuel pressure and the fuel pump was only building something like 14psi and as soon as the pump stopped priming the pressure would bleed out immediately.
The fuel pressure should build to something probably around ~50psi, I don't know the spec off the top of my head, and hold pressure without loosing much more than ~5psi for ~5 minutes after the pump has stopped priming. If it doesn't build pressure it could be a clog in the system or a weak pump and if it builds pressure but bleeds off too fast then it's either an external leak from a fuel line or the fuel pump could be bleeding pressure back into the tank.
Last edited by ejfromwestbay; Jul 5, 2011 at 01:59 PM.
Thread Starter
Honda-Tech Member
Joined: Nov 2008
Posts: 79
Likes: 0
From: sacramento, ca, usa
Re: got 28 psi on fuel pump with code 43
x2
Or it could be the fuel pressure regulator as well
Specs @ idle
With the fuel pressure regulator vacuum hose connected = 30-73psi
With the fuel pressure regulator vacuum hose disconnected & pinched = 38-46psi
A 28psi fuel pressure reading is low and probably causing a lean condition. (code 43)
Or it could be the fuel pressure regulator as well
Specs @ idle
With the fuel pressure regulator vacuum hose connected = 30-73psi
With the fuel pressure regulator vacuum hose disconnected & pinched = 38-46psi
A 28psi fuel pressure reading is low and probably causing a lean condition. (code 43)
Honda-Tech Member
Joined: Mar 2007
Posts: 11,399
Likes: 69
From: East Coast 506, Canada
Re: got 28 psi on fuel pump with code 43
When you have the gauge hooked up you need to check it both with and without vacuum.
1. With the engine running make sure there is vacuum to the FPR.
2. Check pressure with the vacuum disconnected = 38-46psi (pinch/clamp the hose so as not to cause a vacuum leak)
3. Connect the hose to the FPR, the pressure should drop
4. Disconnect the vacuum hose and check that the pressure rises again.
If the pressure does not rise and drop replace the FPR. If it does rise and fall but it is not up to the specified pressure. Search both the feed and return fuel lines for kinks, dents, restrictions or leaks. After that it's on to checking the fuel pump.
1. With the engine running make sure there is vacuum to the FPR.
2. Check pressure with the vacuum disconnected = 38-46psi (pinch/clamp the hose so as not to cause a vacuum leak)
3. Connect the hose to the FPR, the pressure should drop
4. Disconnect the vacuum hose and check that the pressure rises again.
If the pressure does not rise and drop replace the FPR. If it does rise and fall but it is not up to the specified pressure. Search both the feed and return fuel lines for kinks, dents, restrictions or leaks. After that it's on to checking the fuel pump.
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