Loosing fuel pressure when off. - Nissan Forum
GA16DE 1.6L Engine Engine Discussion: 91-99 Sentra, 95-98 200SX, 91-93 NX1600

 
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post #1 of 14 Old Nov 28th, 2005, 09:55 PM Thread Starter
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Loosing fuel pressure when off.

I have been having starting problems suddenly with my 93. Lots of cranking but no start. Like it wasn't getting fuel. So if I but the ignition to on and let the fuel pump prime the system, it starts fine. So what would cause the fuel pressure to drop while sitting. It only takes a few hours of sitting to start having issues.

Thanks
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post #2 of 14 Old Nov 29th, 2005, 12:47 AM
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Quote:
Originally Posted by turboawd
I have been having starting problems suddenly with my 93. Lots of cranking but no start. Like it wasn't getting fuel. So if I but the ignition to on and let the fuel pump prime the system, it starts fine. So what would cause the fuel pressure to drop while sitting. It only takes a few hours of sitting to start having issues.

Thanks
Is yoru gas cap OK? I ALWAYS let my fuel pump prime before start up! Anyways many cars will bleed off fuel pressure over time as they have a fuel return, this is normal and should not necessarily cause hard starting. Are you sure the problem isn't something else?

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post #3 of 14 Old Nov 29th, 2005, 01:35 AM
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he is very possibly right, try letting you pump produce pressure befor cranking it over, to do this just bring the key to the on position for several seconds. i do this everyday just to ensure a quick start, my car also loses presure but there is no problem with that.

By the way dose the car actuly start?, eventualy?
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post #4 of 14 Old Nov 29th, 2005, 12:40 PM Thread Starter
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Yes it will start fine if I let the pump prime for 20 seconds. But I never had to prime it before this problem started and it used to start pretty easily. If I don't let it prime now it cranks forever and eventually starts. Then it runs rough for a while and then is ok. I will check the gas cap is on ok.
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post #5 of 14 Old Nov 29th, 2005, 08:24 PM
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Replaced your fuel filter recently?
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post #6 of 14 Old Nov 29th, 2005, 09:08 PM
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Problem A==== Fuel filter
Problem B==== Fuel pump dying..

Ive only experienced it on Nissans, but often when the vehichle is haveing fuel issues on start it turns out to be the pump... I think its because they use a higher voltage initially to prime the system. After that it drops off unless you need extra fuel Ex. WOT. Check the filter FIRST though... Then run a Fuel Pressure test..

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post #7 of 14 Old Dec 2nd, 2005, 01:53 PM
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You might check your fuel lines. I recently had the same problem as you on my '91, and found some small cracks in the fuel hoses. I wasn't losing fuel physically, but it was drawing air into the system. Replacing all the hoses solved the issue.

Bob
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post #8 of 14 Old Dec 5th, 2005, 12:10 PM
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when you say you let it prime for twenty seconds, do you actuly mean that the pump runs all twenty seconds? if so you most likley have a presure leak in your hoses. i would first look at all the fittings and conections by your filter, fuel rail, and all the way to the back of the vehicle evently. i hope you find a simple fix. good luck
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post #9 of 14 Old Dec 22nd, 2005, 10:37 AM Thread Starter
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Still having hard start issue as well some slight idle surge and poor gas mileage. The other strange thing is that the cooling fans start running right away when the engine is dead cold at its -10C. The A/C is off. I'm thinking the coolant temp sensor or air temp sensor is faulty. Would this make the ECU think its hot and causing the cold start problem?
If the coolant temp sensor is faulty, would it not trigger a check engine light?

Is there an aftermarket coolant temp sensor available?

Thanks
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post #10 of 14 Old Dec 22nd, 2005, 12:27 PM
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Quote:
Originally Posted by turboawd
Still having hard start issue as well some slight idle surge and poor gas mileage. The other strange thing is that the cooling fans start running right away when the engine is dead cold at its -10C. The A/C is off. I'm thinking the coolant temp sensor or air temp sensor is faulty. Would this make the ECU think its hot and causing the cold start problem?
If the coolant temp sensor is faulty, would it not trigger a check engine light?

Is there an aftermarket coolant temp sensor available?

Thanks
Your CTS being faulty could definetly cause the Starting issue... Normally when a CTS goes bad the ECM see it as COLD (like -35). This will cause Excessive Fuel to be dumped in and give you the poor mileage...

And yes this "Should" trigger the CEL but on pre-OBDII models its not always a Definite. Check Haynes, Chiltons, or FSM for exact testing procedures.

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post #11 of 14 Old Jan 3rd, 2006, 11:18 AM Thread Starter
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Looks like the coolant temp sensor is gone. Reistance was very low on a cold motor. Like I said before, both rad fans are always on regardless of A/C switch on or off. Will coolant spill out when I try to replace the sensor ?

Also, looks like the TPS is also gone. Not sending any voltage. I measured 5v at the harnes but almost nothing through the sensor even when rotated. The car still runs ok but not great with these two problems and no check engine light ? Is there an aftermartet TPS? If not what does Nissan want $$ for one ?

Thanks
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post #12 of 14 Old Jan 3rd, 2006, 07:17 PM
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Quote:
Originally Posted by turboawd
Looks like the coolant temp sensor is gone. Reistance was very low on a cold motor. Like I said before, both rad fans are always on regardless of A/C switch on or off. Will coolant spill out when I try to replace the sensor ?

Also, looks like the TPS is also gone. Not sending any voltage. I measured 5v at the harnes but almost nothing through the sensor even when rotated. The car still runs ok but not great with these two problems and no check engine light ? Is there an aftermartet TPS? If not what does Nissan want $$ for one ?

Thanks
The fans running all the time may mean your ECU is shot. Mine was, but the CEL blinked in morris code sometimes at first, then all the time until I replaced the ECU. It had nothing to do with the coolant temp sensor like I thought at first. I didn't measure resistance, I just replaced it since it was a cheap part and I like piece of mind.

Nissan charges about $100-150 for the TPS, I believe.

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Last edited by Kindfiend; Jan 3rd, 2006 at 07:20 PM.
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post #13 of 14 Old Jan 6th, 2006, 02:14 PM
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your fuel pressure is maintained by the pressure regulator to hold. Now the return lines send the fuel back when the car is turned off. The pump churns up until the regulator hits the pressure and then the pumps turns off at the right pressure.

If you have a leak its in the line connections. Old fuel lines will leak at the connections eventually.

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post #14 of 14 Old Jan 31st, 2006, 09:39 PM
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Some possible things to check for hard starting:
Leaking fuel lines.
Faulty fuel pressure regulator.
Leaking injector.
Defective pump.
Good luck.
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