Fuel Pressure Regulator - Land Rovers Only

iwish · 10-10-2004, 06:54 PM

My 96 disco 4.0 is having trouble starting when warm. It runs like a champ after it gets started, but it takes a few tries to get it fired up, and once it starts, it idles very high for a short time. A bit more information, and it has only done this twice, but while driving on the highway, it would not accelerate past 2k rpm. I am pretty sure it is either the fuel pump or the fuel pressure regulator, but I am not sure how to tell which it may be.

Thank You all for you help. This is a great forum.
:

dent · 10-10-2004, 08:23 PM

check fuel pressure and should be around 32
take care
sam

mbruneaux · 10-10-2004, 09:20 PM

The cheapest thing to try is replacing the inline fuel filter

iwish · 10-11-2004, 08:33 AM

Thanks for the advice. I replaced the fuel filter about 9 months ago, so I guess I should do that again first. If I still am not getting 32psi in the rail, any thoughts on how to tell if the problem is the pump or the reg?

thanks again.

dent · 10-11-2004, 09:32 AM

listen for it... tell tale sign is loud whining coming from gas tank.. how many km/ miles do you have on it and is it still the original?
take care
sam

iwish · 10-11-2004, 10:06 AM

It has about 80k now. I am pretty sure the pump is original. How often do they usually go out? I know on other trucks, I have had them go at 120k or so. I will listen to the pump when I get home. Thanks sam.

rovertech · 10-11-2004, 11:10 AM

i would put all my money on the pump. the reason it doesnt start cold is because the check valve in the pump is stuck letting the fuel in the rail to leak back to the tank. so when you start it you have to pressurize the rail again. the pump is easily accessable through the floor under the carpet in the cargo area. the problem at 2k rpm is also because of the pumps weak pressure. good luck. and if you do the pump make sure to get a new gaket ring and accorn fittings if applicable.

iwish · 10-11-2004, 11:49 AM

Thanks a lot. I will give it a shot. I will be sure to let you know how it turns out. By the way, any luck on the job hunt rovertech?

sidawson · 10-12-2004, 08:10 AM

My experience is that the pumps on Land Rovers don’t last much past 80 to 100 thousand miles, and it’s usually the brushes in the motor that go first. Dent is right, a louder than usual whering noise is a good sign that the pump is on its last legs. Or no noise at all when you turn the ignition on.
Don’t waste time with the fuel filter if you changed it 9 months ago, I cant see that it would be clogged up in that short amount of time.
If you think you are having fuel pressure/delivery problems and you have 80K on an original I WOULD consider changing it.
Like I said if it where ME I would get it changed. If it goes out 50 miles from home you’ll be towing it back and when they go they just stop with out warning. I know.

iwish · 10-12-2004, 08:46 AM

Thanks for the advice. I ordered a pump kit last night. I wasn't as expensive as I thought it would be. A rover first for sure.

rovertech · 10-12-2004, 11:13 AM

no luck with the job hunt but thanks 4 asking. good luck putting the pump in if you need guidance please dont hesitate to ask. also if i were you i would access the pump cover and put some rust penetrant on the screws they tend to seize and break. also an impact driver will help get them off in one piece

Helopilot · 10-12-2004, 01:01 PM

Saw this on a site, very detailed on how to do the job...pics and all.

http://www.4x4wire.com/rover/mainten...elpumpinstall/

Its for a '96 Disco.

B.

PTSchram · 10-13-2004, 08:17 AM

If the fuel pressure is found to be acceptable, or the problem persists with replacing of the fuel pump, it may well be leaking injectors. You may find the hard start is due to flooding of the cylinders-the high engine speed leads me to believe this may be the problem.

These problems seem to come in spurts, I have now replaced three fuel pumps in the last month!

Peace,
PT

iwish · 10-13-2004, 12:33 PM

You know, originally I thought the problem may be leaky injectors as well, but I don't think that would explain the problem when driving down the highway, would it? The truck seems to start and run fine while it it cold, which makes me think it may also be the fuel temp sensor. I will start with the pump I guess, and see what happens after I get that put in. It could be a combination of things, I suppose.

Thanks

iwish · 10-13-2004, 12:38 PM

By the way, if I do a leak down test, and the injectors are leaking, can they be rebuilt, or only replaced?
thanks again. I appreciate all the help.

10-10-2004, 06:54 PM	#1 (permalink)
iwish Member Join Date: Aug 2004 Posts: 11 Gallery: 0	Fuel Pressure Regulator My 96 disco 4.0 is having trouble starting when warm. It runs like a champ after it gets started, but it takes a few tries to get it fired up, and once it starts, it idles very high for a short time. A bit more information, and it has only done this twice, but while driving on the highway, it would not accelerate past 2k rpm. I am pretty sure it is either the fuel pump or the fuel pressure regulator, but I am not sure how to tell which it may be. Thank You all for you help. This is a great forum. :

10-11-2004, 11:10 AM	#7 (permalink)
rovertech Member Join Date: Sep 2004 Location: chicago suburbs Posts: 62 Gallery: 0	pump i would put all my money on the pump. the reason it doesnt start cold is because the check valve in the pump is stuck letting the fuel in the rail to leak back to the tank. so when you start it you have to pressurize the rail again. the pump is easily accessable through the floor under the carpet in the cargo area. the problem at 2k rpm is also because of the pumps weak pressure. good luck. and if you do the pump make sure to get a new gaket ring and accorn fittings if applicable.

10-12-2004, 11:13 AM	#11 (permalink)
rovertech Member Join Date: Sep 2004 Location: chicago suburbs Posts: 62 Gallery: 0	no luck no luck with the job hunt but thanks 4 asking. good luck putting the pump in if you need guidance please dont hesitate to ask. also if i were you i would access the pump cover and put some rust penetrant on the screws they tend to seize and break. also an impact driver will help get them off in one piece

10-12-2004, 01:01 PM	#12 (permalink)
Helopilot Member Join Date: Sep 2004 Posts: 20 Gallery: 0	Pump Directions Saw this on a site, very detailed on how to do the job...pics and all. http://www.4x4wire.com/rover/mainten...elpumpinstall/ Its for a '96 Disco. B.

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10-10-2004, 08:23 PM	#2 (permalink)
dent beer drinking member Join Date: Aug 2004 Posts: 322 Gallery: 0	check fuel pressure and should be around 32 take care sam

10-10-2004, 09:20 PM	#3 (permalink)
mbruneaux Member Join Date: Sep 2004 Location: Killingly, CT USA Posts: 86 Gallery: 0	The cheapest thing to try is replacing the inline fuel filter

10-11-2004, 08:33 AM	#4 (permalink)
iwish Member Join Date: Aug 2004 Posts: 11 Gallery: 0	Thanks for the advice. I replaced the fuel filter about 9 months ago, so I guess I should do that again first. If I still am not getting 32psi in the rail, any thoughts on how to tell if the problem is the pump or the reg? thanks again.

10-11-2004, 09:32 AM	#5 (permalink)
dent beer drinking member Join Date: Aug 2004 Posts: 322 Gallery: 0	listen for it... tell tale sign is loud whining coming from gas tank.. how many km/ miles do you have on it and is it still the original? take care sam

10-11-2004, 10:06 AM	#6 (permalink)
iwish Member Join Date: Aug 2004 Posts: 11 Gallery: 0	It has about 80k now. I am pretty sure the pump is original. How often do they usually go out? I know on other trucks, I have had them go at 120k or so. I will listen to the pump when I get home. Thanks sam.

10-11-2004, 11:49 AM	#8 (permalink)
iwish Member Join Date: Aug 2004 Posts: 11 Gallery: 0	Thanks a lot. I will give it a shot. I will be sure to let you know how it turns out. By the way, any luck on the job hunt rovertech?

10-12-2004, 08:10 AM	#9 (permalink)
sidawson Member Join Date: Aug 2004 Posts: 33 Gallery: 0	My experience is that the pumps on Land Rovers don’t last much past 80 to 100 thousand miles, and it’s usually the brushes in the motor that go first. Dent is right, a louder than usual whering noise is a good sign that the pump is on its last legs. Or no noise at all when you turn the ignition on. Don’t waste time with the fuel filter if you changed it 9 months ago, I cant see that it would be clogged up in that short amount of time. If you think you are having fuel pressure/delivery problems and you have 80K on an original I WOULD consider changing it. Like I said if it where ME I would get it changed. If it goes out 50 miles from home you’ll be towing it back and when they go they just stop with out warning. I know.

10-12-2004, 08:46 AM	#10 (permalink)
iwish Member Join Date: Aug 2004 Posts: 11 Gallery: 0	Thanks for the advice. I ordered a pump kit last night. I wasn't as expensive as I thought it would be. A rover first for sure.

10-13-2004, 08:17 AM	#13 (permalink)
PTSchram Member Join Date: Sep 2004 Location: Fort Wayne, IN Posts: 50 Gallery: 0	If the fuel pressure is found to be acceptable, or the problem persists with replacing of the fuel pump, it may well be leaking injectors. You may find the hard start is due to flooding of the cylinders-the high engine speed leads me to believe this may be the problem. These problems seem to come in spurts, I have now replaced three fuel pumps in the last month! Peace, PT

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10-13-2004, 12:33 PM	#14 (permalink)
iwish Member Join Date: Aug 2004 Posts: 11 Gallery: 0	You know, originally I thought the problem may be leaky injectors as well, but I don't think that would explain the problem when driving down the highway, would it? The truck seems to start and run fine while it it cold, which makes me think it may also be the fuel temp sensor. I will start with the pump I guess, and see what happens after I get that put in. It could be a combination of things, I suppose. Thanks

10-13-2004, 12:38 PM	#15 (permalink)
iwish Member Join Date: Aug 2004 Posts: 11 Gallery: 0	By the way, if I do a leak down test, and the injectors are leaking, can they be rebuilt, or only replaced? thanks again. I appreciate all the help.