240K GT starting problem - Skyline Owners Club

DarkAngel · 16th August 2008, 10:52 AM

At nearly 30 years old I think she is entitled to have the odd problem but this one is killing us. Started last summer at a car show where when we tried to leave the old girl flooded and we had to pull the plugs and dry her out. Finally managed to get home some what later than planned. We then set about trying to fix the problem. With a lot of help from the Datsun Owners Club we have tried everything including replacing the fuel pump (that was a mission!)

State of play now is that when you turn the key you have to wait for the fuel pump to prime the engine, but the fuel pump does not cut out so you have to guess when to fire the engine and its a very fine line between getting it right and flooding her .Once flooded its game over. We have been trying to find any one that is prepared to help but the moment we tell what car it is they all back off! So the old girl has been off the road for a year now and its a real waste. Any advice or information would be greatly appreciated. Thanks in advance.

**Richf** · 16th August 2008, 11:05 AM

So is it fuel injected???

I thought they were carb??

DarkAngel · 16th August 2008, 11:12 AM

Quote:

Originally Posted by Richf

So is it fuel injected???

I thought they were carb??

Its fuel injected. I believe it to be one of the first fuel injected engines the Japs made.

Dad didn't have the engine dropped when the car had its paint job so the engine bay didn't get sprayed.

**Richf** · 16th August 2008, 11:20 AM

So its looks like it was the same colour my friend had hers was a V reg

Well it shouldnt flood with injection and the pump should cut out when the pressure is reached , sounds like a leak in the pressurised side of the system , have the injectors been checked at all ??

**Ahapartridge** · 16th August 2008, 11:21 AM

To be honest I would get yourself registered on some Z car forums, UK and USA, they are bound to have a wealth of information as the engines share quite a lot in comon with the Zeds

**Jez-R32 GTR** · 16th August 2008, 11:40 AM

It sounds like your fuel pressure is to high, the new pump is sending to much fuel and the regulator can't deal with it. What pump have you fitted? and what is the standard pump rated at? I take it it's not common rail multi point. What about fitting an adjustable fuel pressure regulator and a new fuel return pipe?

**Little Kez** · 16th August 2008, 11:42 AM

Rb30, T40z

DarkAngel · 16th August 2008, 11:54 AM

Quote:

Originally Posted by Jez-R32 GTR

It sounds like your fuel pressure is to high, the new pump is sending to much fuel and the regulator can't deal with it. What pump have you fitted? and what is the standard pump rated at? I take it it's not common rail multi point. What about fitting an adjustable fuel pressure regulator and a new fuel return pipe?

With the help of the Datsun Owners Club we sourced a fuel pump for a 240Z as we were advised by a very knowledgeable Datsun fanatic that this was basically the same pump.

Common rail multi point? Do you mean the metal pipes that run into the injectors? Forgive my ignorance, but I am a woman!

Quote:

What about fitting an adjustable fuel pressure regulator and a new fuel return pipe?

Sounds like a plan, I will run this past the old man!

**Jez-R32 GTR** · 16th August 2008, 12:50 PM

Other than that it sounds like little Kez has a plan. LOL

**turbob12** · 17th August 2008, 09:39 AM

I'm no expert but it sounds to me like the fuel pump isn't cutting off because it doesn't know that the system is primed and the fuel pressure has been reached, I'd be looking at the pressure regulator or a relay. What controls the fuel pump and tells it to stop priming?

Welcome to SOC by the way.

**Richf** · 17th August 2008, 09:48 AM

Another easy thing to check is the engine oil , does it smell of fuel??

I'm not convinced its the pump i think the pump keeps running because there is a leak , fitting an inline fuel pressure gauge would show if the problem is pump related but i would be checking the injectors if it were me , a leaky one could easily cause the flooding yet be barely noticable when the car is running

If the fuel pressure was really high the injectors will struggle to work properly so the car would drive and run very badly all the time especially on idle when warm

**Andy W** · 17th August 2008, 09:58 AM

my guess would be injectors or seals

clamp off the fuel return line if the pump keeps running the fuel has to be going somewhere

**Bubble** · 17th August 2008, 11:43 AM

If it is leaking injectors, it will thin down your engine oil and you run the risk of damaging the bottom end of the engine. Pull out your dip stick and have a sniff, if it smells of petrol you are on borrowed time

16th August 2008, 10:52 AM	#1
DarkAngel Skyline Enthusiast Registered User Join Date: Aug 2008 Location: Aveley Drives: Datsun Skyline 240K GT, Ford Ranger Thunder, Ford Fiesta Posts: 10	240K GT starting problem At nearly 30 years old I think she is entitled to have the odd problem but this one is killing us. Started last summer at a car show where when we tried to leave the old girl flooded and we had to pull the plugs and dry her out. Finally managed to get home some what later than planned. We then set about trying to fix the problem. With a lot of help from the Datsun Owners Club we have tried everything including replacing the fuel pump (that was a mission!) State of play now is that when you turn the key you have to wait for the fuel pump to prime the engine, but the fuel pump does not cut out so you have to guess when to fire the engine and its a very fine line between getting it right and flooding her .Once flooded its game over. We have been trying to find any one that is prepared to help but the moment we tell what car it is they all back off! So the old girl has been off the road for a year now and its a real waste. Any advice or information would be greatly appreciated. Thanks in advance.

16th August 2008, 11:05 AM	#2
Richf Skyline Owners Club Club Member Membership No. 688 Join Date: Jan 2007 Location: UK County: Outside UK Drives: R33 GTST Posts: 3,297	So is it fuel injected??? I thought they were carb??
	__________________ 12.8@116 (21/4/07) Stock engine, stock HG, Steel internal tubbie .......more to come

16th August 2008, 11:20 AM	#4
Richf Skyline Owners Club Club Member Membership No. 688 Join Date: Jan 2007 Location: UK County: Outside UK Drives: R33 GTST Posts: 3,297	So its looks like it was the same colour my friend had hers was a V reg Well it shouldnt flood with injection and the pump should cut out when the pressure is reached , sounds like a leak in the pressurised side of the system , have the injectors been checked at all ??
	__________________ 12.8@116 (21/4/07) Stock engine, stock HG, Steel internal tubbie .......more to come

17th August 2008, 09:48 AM	#11
Richf Skyline Owners Club Club Member Membership No. 688 Join Date: Jan 2007 Location: UK County: Outside UK Drives: R33 GTST Posts: 3,297	Another easy thing to check is the engine oil , does it smell of fuel?? I'm not convinced its the pump i think the pump keeps running because there is a leak , fitting an inline fuel pressure gauge would show if the problem is pump related but i would be checking the injectors if it were me , a leaky one could easily cause the flooding yet be barely noticable when the car is running If the fuel pressure was really high the injectors will struggle to work properly so the car would drive and run very badly all the time especially on idle when warm
	__________________ 12.8@116 (21/4/07) Stock engine, stock HG, Steel internal tubbie .......more to come

17th August 2008, 09:58 AM	#12
Andy W Serious Performance Autos Authorized Trader Join Date: Jan 2006 Location: Eastbourne Drives: Skyvan Posts: 8,001	my guess would be injectors or seals clamp off the fuel return line if the pump keeps running the fuel has to be going somewhere
	__________________ Serious Performance Autos 01424 892123

16th August 2008, 11:21 AM	#5
Ahapartridge Half Man Half Partridge Club Member Membership No. 067 Join Date: Dec 2005 Location: In th'ouse County: Cheshire Drives: A 350 without the zee Posts: 4,857	To be honest I would get yourself registered on some Z car forums, UK and USA, they are bound to have a wealth of information as the engines share quite a lot in comon with the Zeds

16th August 2008, 11:40 AM	#6
Jez-R32 GTR Skyline Owners Club Club Member Membership No. 745 Join Date: Dec 2007 Location: Weston Super Mare County: Somerset Drives: R32 Gtr aka "Bif-chit" 3bhp at the starter motor Posts: 342	It sounds like your fuel pressure is to high, the new pump is sending to much fuel and the regulator can't deal with it. What pump have you fitted? and what is the standard pump rated at? I take it it's not common rail multi point. What about fitting an adjustable fuel pressure regulator and a new fuel return pipe?

16th August 2008, 11:42 AM	#7
Little Kez Skyline Owners Club Club Member Membership No. 759 Join Date: Jan 2006 Location: North Wales County: Gwynedd Drives: Mitsubishi Colt Posts: 1,702	Rb30, T40z

16th August 2008, 12:50 PM	#9
Jez-R32 GTR Skyline Owners Club Club Member Membership No. 745 Join Date: Dec 2007 Location: Weston Super Mare County: Somerset Drives: R32 Gtr aka "Bif-chit" 3bhp at the starter motor Posts: 342	Other than that it sounds like little Kez has a plan. LOL

17th August 2008, 09:39 AM	#10
turbob12 Skyline Owners Club Area Rep Membership No. 028 Join Date: Apr 2006 Location: Central Scotland County: Clackmannanshire Drives: R33 GTST Posts: 1,256	I'm no expert but it sounds to me like the fuel pump isn't cutting off because it doesn't know that the system is primed and the fuel pressure has been reached, I'd be looking at the pressure regulator or a relay. What controls the fuel pump and tells it to stop priming? Welcome to SOC by the way.

17th August 2008, 11:43 AM	#13
Bubble Club Treasurer & Essex Rep. Administrator Membership No. 107 Join Date: Jan 2006 Location: Colchester / Braintree County: Essex Drives: R34GTT / Pajero / X-Trail DCi Posts: 8,566	If it is leaking injectors, it will thin down your engine oil and you run the risk of damaging the bottom end of the engine. Pull out your dip stick and have a sniff, if it smells of petrol you are on borrowed time
	__________________ R34GTT RB30 with a T04Z - 675bhp / 574lbs @ 1.5 bar 12.28 @116 TOTBV Skyline Owners Club - Essex Meet Here

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