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Why is the pressure on my Pentax water pump no building up

Changing the filter

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  • Cars & Trucks Master
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Bleed all the air out of the system.

Posted on Dec 11, 2014

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SOURCE: I have a 1996 cabrio vw that has high oil pressure

that is normal it converts to approx 4bar it is normal should be around 50 at idlr

Posted on Aug 20, 2009

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SOURCE: changed fuel filter on my 05 Audi a4 3.0. Now I'm not getting no pressure build up by fuel rail

If the fuel pump check valve check valve is bad, the car may be unable to start. If the car does not start, turning the key so that it is one click away from starting, then repeating this process several times, may build up enough pressure so that the vehicle starts. If that is the case, the check valve is bad and needs to be replaced. check the fuel pressure regulater also. good-day ! If fuel pressure is low, disconnect the vacuum hose to the regulator. You should see an increase in pressure, if the regulator is not leaking. No change would indicate a bad regulator, check this first and get a fuel pressure reading on it to determine the pressure.

Posted on Apr 18, 2012

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1992 F350-7.3 4wheel drive is hard to start after changing fuel filter and fuel pump. Why is it hard to start?


indicates fuel leak back and fuel pressure drop
check filter installation for seal not sitting properly, loose fuel line fitting , pump installed correctly (flow wise ), filter installed correctly (flow wise)
air getting in to fuel lines
the thing you are looking for is indicated by the initial hard start but when started runs ok ( good fuel to the engine eventually) and then by the fact that if the engine is allowed to sit for a long period the problem returns meaning that the fuel pressure is not being held
could even be a problem fuel pressure regulator allowing the fuel to bypass ( no pressure =hard starting) then gets enough pressure to run ok but allows that pressure to drain off over time

Oct 29, 2016 | 1992 Ford F350

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My 1999 crown vic is still not building fuel pressure. I've changed the fuel pump and fuel pump relay still not building enough pressure. What else can i try


check or replace fuel pressure regulator. symtoms are. lack of fuel pressure, excessive fuel pressure, black smoke and engine running rich, instant drop of fuel pressure, when turned off delay building back up sufficient fuel pressure. also be sure fuel filter is not plugged. check the filter first !!

Oct 24, 2011 | 1999 Ford Crown Victoria

1 Answer

Will not start with first crank. Usually it needs to build up fuel pressure first. Is there another fix other than changing the fuel pump?


Make sure the fuel pressure regulator is good. there is a small vacuum line, take the line off and be sure no fuel comes out of it, if it does the regulator is bad. if thats the problem replace the pump.i thas to have at least 60psi. be sure to replace the filter, and use quality parts unless you want to do it more than once.

Sep 07, 2011 | 1999 Chevrolet Silverado 1500

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Radiator building too much pressure. We have replace the tstat and the water pump. It is building up to over 20 pp.


if coolant is ok, try by changing radiator cap. it may be bad. another possibility is that either you did not get all the air out of the system,,,or possibly have a blown head gasket.

Aug 18, 2011 | 1997 Subaru Impreza

1 Answer

Cars wants to cut off on start up and for the first 1/2 mile but once you get going it runs OK


Ok... Based on what your saying it sounds like you have a fuel problem. Your symptom is not common for an electrical problem. The pump sounds like it is having a hard time building and holding fuel pressure. (note this could also just be a restricted fuel filter). If it were me I would check the fuel pressure and see if it is to spec. If you dont have a guage try changing the fuel filter. If the problem is still present then get a guage on it and check the pressure of the pump. Good luck!

Aug 27, 2010 | 1989 Oldsmobile Cutlass Ciera

2 Answers

1983 fleetwood southwing fuel system schematic for diagnosing / repairing no fuel getting from tank to engine intremittently - plenty of fuel in the tank itself...


Lots of possibilities.

Could have corrosion build up and rust clogging fuel tank pick up. Usually reverse air pressure helps, but would help to remove tank sending unit to see if you can **** out any water or gunk.

Could have vacuum building up in tank. Make sure charcoal canister purge valve is working right, and no hiss when taking off gas cap.

Could be fuel pump. Check pressure and volume, leakage, etc.

Could be filter. If carb, remember there is a small filter in the carb as well.

If fuel injected, may have bad pressure regulator or safety valve in line.
The pressure test results will help.

Mar 02, 2010 | 1983 Chevrolet Chevy

1 Answer

Hard to start engine hot or cold


Possibly fuel pump losing pressure or leaking down. try changing fuel filter and try cycling ignition a few times and see if that helps build up fuel pressure. I don't know what engine you have so this is best I can do for now. hope this helps

Jul 16, 2009 | 2003 Ford Windstar

1 Answer

I have to turn the ignition on and off several times before the car starts. Recently replaced water pump after car overheated. Could coolant have caused the issue?


Replace fuel filter if it has not been done in a while. Also check fuel pump pressure with a gauge and compare with spec. When key is turned "on" the computer turns on fuel pump via relay. If the computer does not see rpm signal (engine start) within approx. 2 seconds it turns the fuel pump back off. Cycling the key often helps to build up fuel pressure sufficient to start when filter is plugged or pump pressure is weak.

Jun 29, 2009 | 1999 Ford Expedition

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