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Pentax smart hd pump building 60psi dropping to 20psi before pump starts again. Sometimes it do not start

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

emissionwiz
  • 75066 Answers

SOURCE: FUEL PRESSURE DROPS WHEN PUMP STOPS.HARD TO START

The fuel pressure check valve in the electric fuel pump has failed, you will have to replace the fuel pump, it is in the gas tank, also replace the filter at the same time or the warranty on the new pump will be voided.

Posted on Nov 04, 2008

  • 78 Answers

SOURCE: oil gauge at start up run about 45psi then drops off 10-20 psi

Thats normal on high milage engines. They do that because the cam and main bearings are warn.
Try an oil treatment.

Posted on Dec 27, 2008

  • 356 Answers

SOURCE: 2000 blazer 4.3 hard to start (fuel problem)

Do you have the fuel tester hooked the in the overgrown air valve on the fuel rail in the back of the engine? Or do you have the fuel line unhooked in the back and hooked to the pressure pump? You want the fuel pressure to be in that 60 lb range so if you are hooked into the pressure valve on the fuel rail allowing fuel to go through, then I am betting it is the fuel pressure regulator. To get to that, you have to take the throttle body off and take the plastic plenum that covers the injector packs. On the back of the mount where your six pack of injectors are sits the pressure regulator. If it is faulty then it is dumping fuel instead of holding the pressure like it should.
Get a Chilton or Clymer manual and it shows you in pretty good detail how to fix it. I've done it to my 98 S10 with the same engine.

If you unhooked the fuel line so you are losing pressure from the line back to the pump then I would say your pump is letting fuel back to the tank when it shuts off. My money is on the first possibility though.

Good luck

Posted on Mar 28, 2009

  • 4 Answers

SOURCE: I have a 1999 Chevy Suburban that is sometimes

Hi there,
One of two things can go wrong here. The fuel pressure is supposed to stay after you shut off the eng or key. The reason for this is so the eng does not have to keep cranking while the pump builds up pressure. The fuel pump has a check valve that will hold the pressure and the injectors will hold on the other end. If the injectors are leaking fuel when you shut the key off you should be able to look down the intake after removing the air cleaner and see if fuel sprays down into it after you have someone cycle the key for you. I believe you still have the throttle body injection so i would start there to see if fuel is leaking past the injector. If it is not then the pump has a bad check vale but this is just the tip of the ice berg. Neither of these conditions will cause it not to start. It will just crank longer before it does. in other words don't concentrate on this to fix the no start condition. Be sure you have a good battery. If battery voltage drops below 10 volts when you are cranking it, it will not start because the computer will not fire the injectors. It will still crank but just not start.

Posted on Jun 08, 2009

  • 126 Answers

SOURCE: When engine warms I start to lose oil pressure.At

did you just buy this vehicle? 20 PSI hot at idle may be considered normal. I would verify the oil pressure specs with a repair manual for that vehicle. If it is out of spec then recheck with a manual Oil Pressure Guage. If it is still out of spec it could be worn bearings or a bad oil pump, having worked on these cars I recommend you let a Professional change the engine if it comes to that, and if you have little experience at such

Posted on Oct 15, 2009

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1 Answer

How do you replace a fuel pressure regulator in a 1996 Chevrolet C-1500 4.3 Vortek engine?


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Truck runs good at idle but after running it starts to miss fire as if running out of gas


Install a fuel pressure gauge. Key on engine off it should build close to 60psi and back off a few lbs. It should hold steady and not drop off. If it does drop off, replace the pump. Engine running at idle, it should be reading right around 52-54 psi. The engine will barely start/run at 50 psi.

Mar 24, 2014 | 2002 Chevrolet S-10

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Hard start cold, fine rest of day


I would be checking to see why there is power to the pump with the ignition off as this is a source to flat battery overnight.. May be a relay is still activated by a power source other than the ignition.

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2004 gmc sonoma why does it take 2-3 times cranking before it starts and only does it sometimes?


install pressure gauge and watch when key is turned off to see if pressure drops to zero if so bad drain back valve in fuel pump replace it or deal with it or could be cheap aftermarket pump and has hard time building unnecessary pressure to open poppet valves between before fuel injectors

Oct 23, 2012 | 2004 GMC Sonoma

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Fuel pump constantly runs when engine is running


what type of vehicle and engine size? fuel punps are suppose to run while the engine is running. the full fuel pressure depends on the type of vehicle. some fuel systems only run 12-20psi while others can run 48-60psi

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Oil vevel readins on 2002 chev venture average rreading


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Sep 02, 2010 | 2000 Chevrolet Venture

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96s10 starting problems replaced throdle position sensor,fuelpump relay,no start shot of starting fluid fires right up and runs


Check the fuel pressure at the shredder valve. You should have 60psi to 65psi with the fuel pump primed and engine not running. Once the engine has been started, there should be a 5psi drop. Make sure the fuel filter has been replaced and that the fuel pump is making at least 60psi. Anything less or more then 65psi will not activate the fuel injectors, the other thing to is that the spider injection system on the vortec are know to go bad and you may have to replace the system. Good luck and keep me posted, be glad to help you get your S-10 running 100% again. 

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I have a 1999 Chevy Suburban that is sometimes hard to start. Most of the time it starts just fine. Then sometimes it acts like it is flooded. After waiting for an hour, it starts right up. Installed new...


Hi there,
One of two things can go wrong here. The fuel pressure is supposed to stay after you shut off the eng or key. The reason for this is so the eng does not have to keep cranking while the pump builds up pressure. The fuel pump has a check valve that will hold the pressure and the injectors will hold on the other end. If the injectors are leaking fuel when you shut the key off you should be able to look down the intake after removing the air cleaner and see if fuel sprays down into it after you have someone cycle the key for you. I believe you still have the throttle body injection so i would start there to see if fuel is leaking past the injector. If it is not then the pump has a bad check vale but this is just the tip of the ice berg. Neither of these conditions will cause it not to start. It will just crank longer before it does. in other words don't concentrate on this to fix the no start condition. Be sure you have a good battery. If battery voltage drops below 10 volts when you are cranking it, it will not start because the computer will not fire the injectors. It will still crank but just not start.

Jun 08, 2009 | 1999 Chevrolet Silverado 1500

1 Answer

Car stalls when oil pressure drops...20 minutes to restart


No it is a fail safe. When your oil pressure drops below (on most cars) 30 psi your computer will shut your fuel pump down until you either let it sit for a while and it resets or until oil pressure builds again. Sorry!

Mar 11, 2009 | 1992 Buick Roadmaster

1 Answer

Oil pressure fine when i start car. when you drive for a little the pressure will drop and rise any solutions.


Depending on the range of rise and fall, this is completely normal. Oil thins out as it gets hot so you will notice the pressure drop significantly at hot idle. A typical value would be 20psi, then as the engine revs up, the pump creates more pressure because it can now keep up with and exceed the leak-down or bleed-off from the bearings. The maximum pressure would be limited by the relief valve in the oil pump which could typically be as high as 60psi.

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