Fuel Pressure Regulator and fuel pump
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infinitij30car1993
- Posts: 25
- Joined: Mon Jan 15, 2007 11:14 pm
Fuel Pressure Regulator and fuel pump
hello any out there know how to test the Fuel Pressure Regulator to see if it is working properlly and the fuel pump as well, is that some kind of hints that if the fuel pump is fautly? tanks
Re: Fuel Pressure Regulator and fuel pump (infinitij30car1993)
Here are the some steps i followed for fuel pump and hypertech fuel pressure regulator testing.Fuel pump test1. key on, engine off, fuel pressure should come up quickly and hold steady at a fixed value. 2. Compare the pressure reading to specifications. If you get no pressure reading, check for voltage at the pump. If there is voltage but the pump is not running then you got bad fuel pump.
Fuel pressure regulator test:1. With the engine running, disconnect the vacuum hose from the pressure regulator. Note: fuel system pressure should increase 8 to 12 psi with the line disconnected. No change would indicate a faulty pressure regulator, or a leaky or plugged vacuum line.2. Engine vacuum will suck raw fuel into the intake manifold through the vacuum hose if the diaphragm inside the regulator is leaking.
Fuel pressure regulator test:1. With the engine running, disconnect the vacuum hose from the pressure regulator. Note: fuel system pressure should increase 8 to 12 psi with the line disconnected. No change would indicate a faulty pressure regulator, or a leaky or plugged vacuum line.2. Engine vacuum will suck raw fuel into the intake manifold through the vacuum hose if the diaphragm inside the regulator is leaking.
Re: Fuel Pressure Regulator and fuel pump (ryannico)
Hi,
A fuel injector on my 240SX '92 (3d cylinder) went bad. Well, I bought a new one and replaced it. However, I did not do this "pressure release" thing - I, simply, pulled the old injector out with a pair of plyers, then lubricated the o-rings of the new one (just a little bit) with vaseline and pushed the new one in. It went, very nicely, into its place and I covered it with the cap, as it is supposed to be.When I tried to start up the engine - it did not (while before the replacment of the old Fuel Injector for a new one it started up just fine with 3 cylinders).Also, while it was working with 3 cyl. it managed to pump quite a bit of oil into the 1st and 2nd cyls.Well, I pushed the gas pedal about 1/2 to 3/4 in and began crancking the engine over and over again. - Nothing! It does "kah-chi-kah-chi-kah-chi-kah-chi" and after about 15-20 sec. "kah-chi-kah-tah-kah-tah", then (if I do not release the key after about 30 sec) it barely begins to fire and thick smoke starts coming out of the exhaust pipe. Sometimes it manages even to start up (while the key is NOT released!) and get the RPM up to 15-20, as if she is fighting to start up through something very heavily, but as soon as I release the key she dies. Sometimes, she dies even if I do not release the key. (And huge amounts of smoke come out of the exhaust at all times).I don't know what to do anymore. I cannot keep crancking it because the battery is almost dead (brand new (3 days old!)) and I don't know what to do anymore.I think I meessed up the Pressure Regulator's position somehow (by pulling the Fuel Injector with the plyers without releasing the pressure first?) and I need to readjust it. But I don't know how and don't know, even, where it is.My guess as if Why she dies after I release the key (and sometimes WITH the key still turned) is because even when she can overcome all that oil in the cylinders, she only burns what has been pumped by the fuel pump into the system, but because there is no (or incorrect) pressure IN the system the "NEW" fuel does not get supplied to its "destination" and after the initially pumped fuel spends - she dies.I checked everything(!) - and I mean, everything - distributor cap, spark-plug wires (all 4 of them), the sparks (pull out a wire, plug a spare plug in and touch the head while cranking), the Fuel injectors with the electric tester for Oms - they are all alive. Fuel pump can be heard working when I, initially, turn the key. Well, everything I could think of - and, she still does not want to start up.
What do you think I should do?
Modified by Orionbelt at 12:39 PM 6/3/2007
A fuel injector on my 240SX '92 (3d cylinder) went bad. Well, I bought a new one and replaced it. However, I did not do this "pressure release" thing - I, simply, pulled the old injector out with a pair of plyers, then lubricated the o-rings of the new one (just a little bit) with vaseline and pushed the new one in. It went, very nicely, into its place and I covered it with the cap, as it is supposed to be.When I tried to start up the engine - it did not (while before the replacment of the old Fuel Injector for a new one it started up just fine with 3 cylinders).Also, while it was working with 3 cyl. it managed to pump quite a bit of oil into the 1st and 2nd cyls.Well, I pushed the gas pedal about 1/2 to 3/4 in and began crancking the engine over and over again. - Nothing! It does "kah-chi-kah-chi-kah-chi-kah-chi" and after about 15-20 sec. "kah-chi-kah-tah-kah-tah", then (if I do not release the key after about 30 sec) it barely begins to fire and thick smoke starts coming out of the exhaust pipe. Sometimes it manages even to start up (while the key is NOT released!) and get the RPM up to 15-20, as if she is fighting to start up through something very heavily, but as soon as I release the key she dies. Sometimes, she dies even if I do not release the key. (And huge amounts of smoke come out of the exhaust at all times).I don't know what to do anymore. I cannot keep crancking it because the battery is almost dead (brand new (3 days old!)) and I don't know what to do anymore.I think I meessed up the Pressure Regulator's position somehow (by pulling the Fuel Injector with the plyers without releasing the pressure first?) and I need to readjust it. But I don't know how and don't know, even, where it is.My guess as if Why she dies after I release the key (and sometimes WITH the key still turned) is because even when she can overcome all that oil in the cylinders, she only burns what has been pumped by the fuel pump into the system, but because there is no (or incorrect) pressure IN the system the "NEW" fuel does not get supplied to its "destination" and after the initially pumped fuel spends - she dies.I checked everything(!) - and I mean, everything - distributor cap, spark-plug wires (all 4 of them), the sparks (pull out a wire, plug a spare plug in and touch the head while cranking), the Fuel injectors with the electric tester for Oms - they are all alive. Fuel pump can be heard working when I, initially, turn the key. Well, everything I could think of - and, she still does not want to start up.
What do you think I should do?
Modified by Orionbelt at 12:39 PM 6/3/2007
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derekinthez
- Posts: 50
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Re: Fuel Pressure Regulator and fuel pump (Orionbelt)
Not related to your current problem but I think Vaseline contains petroleum and will likely eat away at your rubber o rings.
Re: Fuel Pressure Regulator and fuel pump (derekinthez)
Well, I was suggested to do this by the Nissan Shop and by some folks at the forum as well.Besides, shouldn't it burn away as soon as the engine heats up (a few times)?derekinthez wrote:Not related to your current problem but I think Vaseline contains petroleum and will likely eat away at your rubber o rings.