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Hey my pentax smart head is humming when switched on and the guage is reading 0 psi. The pump is about 10 years old. What's my best move?

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  • Smart Master
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Bin it and get new

Posted on Feb 14, 2020

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5 Suggested Answers

freetek

Steve Allison

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SOURCE: Fuel and Temperature Guages

Have your alternator output checked; the voltage regulator might be failing.
You can check it easily across the battery terminals.
You shouldn't have any more than ~ 14.3 volts at any revs., and about 12.6 with the engine off.

If it checks out OK, the next step would be to access any plugs to the instrument panel, pull the connectors apart and then replug them.
You may have a flaky ground under the dash too.

Posted on Jun 30, 2008

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honeymokey

honeymokey

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SOURCE: oil pressure guage occassionly drops to 0 psi and warning light g

Get it checked with a mechanical gauge. Replace sensor.

Posted on Sep 28, 2009

Anonymous

  • 14 Answers

SOURCE: Fuel pressure intermittently drops causing sputter and die.

check for 12v constant at your fuel pump if you are not getting that replace your relay.
if you are getting 12 volts at your fuel pump the fuel pump is possible to run tuel it gets warm then shut down to a lower rpm I would then replace the fuel pump

Posted on Oct 10, 2009

Anonymous

  • 64 Answers

SOURCE: No fuel PSI.

Have you tried bleeding the fuel system.
its possible you have an air lock
On the top of the motor is a fuel rail. somewhere on the fuel rail is a little black cap. unscrew it. there will be a valve in it that looks a lot like a tire valve. put a rag over it and with the key on push the valve in to let the air out of the system. fuel will probably come out with a force of about 13 lb. so be careful and ware safety gear. gloves, goggles, ect...




Good luck

Posted on Nov 18, 2009

John P Schwantes Jr

  • 1509 Answers

SOURCE: 95 s10 blazer 4.3

Your blazer has to have 55 psi or better to start and starting fluild is possible to flood the plugs now their too wet to fire. Sit awhile and they should dry on thier own. The injectores won't past fuel below about 40 PSI while cranking the voltage to the pump or the pump ground is going away (starters not grounded good enought and the ground goes positive as the car cranks. Put jumper cables from another running car and coonect them right at the starter ( at least the ground, connect it right o the case of the starter, Pos/ can be connected at the battery). sure your battery may be toast and still crank a good starter but the voltage below 10 while cranking may not close the fuel pump relay al or the ingtion module. I've had this problem and sometimes I've found the ingtion module bad and I had it tested at the store and they said it was good but as I sent it in to be tested they sent a new one anyway and the new module would run it and the tested good old one won't start the car. BUT. Everytime it goes back to the quaily of the fuel pump and I've bought a lot of bad ones for GM products that were made by Master and Airtex. I've never had a problem with a Delphi. As long as the crank voltage is good jump it to make sure and the pump wire while cranking is more than 11 volts and it still has less than 55 PSI you take the pump back get another one or demand the delphi, and if they want you to put in another aixtex ask them to pay you to put it in. Bet you'll get the Delphi. The return level is high on the Airtex and Master pumps is high and the parts guy your buying from knowns this unless he's still wet behind the ears, and plain just does'nt know. Orginal equipment in this area keeps the comebacks away and I'm a pro. unless the customer makes me put in the junk pump I don't even give them a choice.

Posted on Sep 23, 2010

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1 Answer

Engine code P2440 is in my 2006 Pontiac grand pix. I have replaced the valve, however engine light came back on and again code P2440 is reading. Any suggestions of how to fix this?



1. Using a scanner, turn the Key On Engine Off (KOEO).

2. Check for a baro reading from the AIR pressure sensor of about 100 kPa (or 14.7 PSI)

3. Start the engine, turn on the air pump and the AIR control solenoid valve. This will measure the pressure from the air moving through the system into the exhaust. Expect to see 8-10 kPa higher than the KOEO kPa reading (or 1.16 to 1.45 PSI higher than KOEO PSI reading).

4. With the engine running, turn on the air pump, but shut off the AIR control solenoid valve. (This is basically a dead head test of the air pump). Expect to see 15 to 22 kPa above the KOEO baro reading (or 2.18 to 3.20 PSI above the KOEO PSI reading).

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remove sending unit and install mechanical gauge to see oil pressure psi if psi reads ok- change sending unit again if psi to low less then 6 replace oil pump och.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/mike_9693b5ad75773352

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Oil pressure always changes with rpm.
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You not only can't have as much pressure at idle, but you don't need it either.

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My 98 Olds Bravada will only start if I spray ether into the carb. Any suggestions?


Hello alfred12954,

Your description sound like the fuel pump is not working. If you have a fuel pressure gauge it should read 60 - 66 psi with the key on. If it reads lower than 60 but more than 0 psi it won't start replace the pump.

If it reads 0 psi you are possibly looking at a wiring problem.

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The oil pressure guage on my 2000 Jeep Grand Cherokee is registering 0. My oil was just changed and I don't see any indication of oil leaking anywhere. Could it be the sensor?


First off I wouldnt drive your car until you make sure that you have indeed oil pressure and that the gauge is a false reading, driving your car if in fact it has no oil pressure will severly damage your engine, but firstly i would check the oil pressure switch its located on the passenger side of the engine right back from the oil filter make sure the connector is clean and free from oil and corrosion if the connector appears to be in good shape take a paper clip and insert it between the 2 terminals inside the connector your oil pressure gauge should peak at 80 PSI that tells you that your gauge and all related wiring are good and in working condition, secondly remove the oil pressure switch and hook an manual oil pressure gauge up to you engine and start the engine the guage should have a oil pressure reading anywhere from 30 PSI to 55PSI depending on engine temperature if theres oil pressure on your manual gauge replace the oil pressure switch with a new unit, if you still have 0 PSI on your gauge then stop your engine immediatly and start looking at your oil pump and lubricating system for a problem.

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95 s10 4.3 blazer new fuel injectors(spider) 2 new fuel pumps new filter was getting 50/60 psi on guage but had to start with starting fluid...now only getting 10/20 psi changed fuel pump...


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The best way to find out is, have a fuel pressure test done, that will reveal a weak pump or not.

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Rather then just thinking the fuel pump is the trouble ,test ! Fuel pressure and flow testing . electrical circuit testing , voltage drop testing . Test don't guess !
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