my jeep has factory wiring for a lift pump!

LanduytG · **Joined:** Sun Dec 11, 2005 6:59 am **Posts:** 188

nursecosmo wrote:

I don't know about the gas liberty but on most other vehicles the in-tank lift pump is very low pressure ( approximately 5lb) the fuel then gos to a high pressure pump under the frame rail (35lb). If the lift pump from the gas model will fit our tank I think that this will be a viable option for us. Also undetectable at the dealer :twisted:

Yes you are somewhat right if the pump being used is for a diesel. But if you use a pump for a gassre it will be to high of pressure.

Greg

TDI4BY · **Joined:** Sun Apr 02, 2006 11:56 pm **Posts:** 644

nursecosmo wrote:

I don't know about the gas liberty but on most other vehicles the in-tank lift pump is very low pressure ( approximately 5lb) the fuel then gos to a high pressure pump under the frame rail (35lb). If the lift pump from the gas model will fit our tank I think that this will be a viable option for us. Also undetectable at the dealer :twisted:

I would not say most. What cars are you working on?

LanduytG · **Joined:** Sun Dec 11, 2005 6:59 am **Posts:** 188

TDI4BY wrote:

nursecosmo wrote:

I don't know about the gas liberty but on most other vehicles the in-tank lift pump is very low pressure ( approximately 5lb) the fuel then gos to a high pressure pump under the frame rail (35lb). If the lift pump from the gas model will fit our tank I think that this will be a viable option for us. Also undetectable at the dealer :twisted:

I would not say most. What cars are you working on?

Any modern car with fuel injection will not be low pressure. Even throttle body is high pressure.

Greg

nursecosmo · **Posted:** Wed Aug 08, 2007 1:08 pm

Perhaps not most but many fuel injected vehicles have two fuel pumps; such as the 1999 S10 I used to own.

http://en.wikipedia.org/wiki/Fuel_pump

I just wonder if the gas liberty had one or two pumps.

Larry R. · **Joined:** Sun Jan 21, 2007 1:35 am **Posts:** 92

Has anyone verified if there jeep has this setup?

crdmike · **Joined:** Tue May 16, 2006 7:25 pm **Posts:** 138

Larry R. wrote:

In the power distrubition center under the hood it has fuse cavity f-17 labeled fuel prime pump and there is a relay (#38 ) labelled fuel prime pump. From the relay I traced the load side wire (brown with white tracer) to connector C-100 (behind the left kick panel) , there it changed to dark green with orange tracer. From there it goes to connector C-201 ( a black connector under the dash, just right of the steering column). It then changes to dark blue with orange tracer. Then it runs along the floor under the front left seat to under the left rear seat. If you pull the carpet up under the left rear seat you will find a light grey 10 pin connector. This is where the dark blue wire with orange tracer ends. I connected a voltmeter to this wire and with the key on It has 12 volts for approx. 15 seconds, and 12 volts all the time when running. I hooked it up today, no chance to run a long road test yet.

Hope this helps, let me know if any of your jeeps have this

.

Larry,

How did that work out for you? I see mine has this as well.

litton · **Posted:** Mon Aug 13, 2007 8:39 pm

The fact that there seems to be wiring in place for a diesel prime pump suggests that Jeep was thinking along those lines. If anyone has access to someone in engineering, it would be a terrific question to ask. Now it seems that the next question would be what pump and where whould it be located. My guess would be either a low pressure in tank or just outside the tank.

Has anyone looked to see if there is a good place to put a pump on the line comiing out of the tank?

Larry R. · **Joined:** Sun Jan 21, 2007 1:35 am **Posts:** 92

It seems to be working fine with a lift pump. It primes before starting and runs all the time the engine runs. I installed a pump from carquest with a pressure of 1.5 to 4 psi, along with some factory repair fittings from carques as well. No leaks yet either, even on the filter housing.

Larry R. · **Joined:** Sun Jan 21, 2007 1:35 am **Posts:** 92

Forgot to say that my pump is mounted just ahead of the tank.

crdmike · **Joined:** Tue May 16, 2006 7:25 pm **Posts:** 138

Larry R. wrote:

It seems to be working fine with a lift pump. It primes before starting and runs all the time the engine runs. I installed a pump from carquest with a pressure of 1.5 to 4 psi, along with some factory repair fittings from carques as well. No leaks yet either, even on the filter housing.

Great to know; I'm installing mine tomorrow and will use the harness. Thanks for the heads up!

crdmike · **Joined:** Tue May 16, 2006 7:25 pm **Posts:** 138

Larry R. wrote:

Forgot to say that my pump is mounted just ahead of the tank.

Great spot, 12mm threaded bolt ready!

Goglio704 · **Posted:** Mon Aug 13, 2007 10:28 pm

Just make sure the pump you use doesn't produce a restriction when it is off or the cure could be worse than the disease. In other words, you don't want to starve the high pressure pump in the the event of a blown fuse or other failure. If you suck through the lift pump with a hand held vacuum pump, you should be able to get an idea how much restriction the pump creates in a failed state.

By the way, great work tracing the wiring Larry R. !

litton · **Posted:** Mon Aug 13, 2007 10:46 pm

Can you give us the P/N of the pump from carquest?

Pablo · **Joined:** Thu Feb 02, 2006 10:06 pm **Posts:** 1201

litton wrote:

Can you give us the P/N of the pump from carquest?

Yes. I am very curious about said pump. Also curious if the centrifical pump will fit in that location neatly.

msilbernagel · **Posted:** Tue Aug 14, 2007 12:30 am

On the Dodge Cummins forums, they recommend a fuel pressure gauge to make sure you notice when a lift pump is failing, and before it causes harm to the CP3 (high-pressure) pump. At least, you might want to put a low-pressure switch with a light/LED, post filter, so you're notified when the filter clogs or pump fails (dual use!).

Mark
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Goglio704 wrote:

Just make sure the pump you use doesn't produce a restriction when it is off or the cure could be worse than the disease. In other words, you don't want to starve the high pressure pump in the the event of a blown fuse or other failure. If you suck through the lift pump with a hand held vacuum pump, you should be able to get an idea how much restriction the pump creates in a failed state.

By the way, great work tracing the wiring Larry R. !

crdmike · **Joined:** Tue May 16, 2006 7:25 pm **Posts:** 138

Goglio704 wrote:

Just make sure the pump you use doesn't produce a restriction when it is off or the cure could be worse than the disease. In other words, you don't want to starve the high pressure pump in the the event of a blown fuse or other failure. If you suck through the lift pump with a hand held vacuum pump, you should be able to get an idea how much restriction the pump creates in a failed state.

By the way, great work tracing the wiring Larry R. !

From Kennedy Lift Pump:

These compact little pumps are just what is needed to keep a steady supply of low pressure fuel available at the inlet of your injection pump at all times. They are nearly silent in operation as well as being seal-less, brushless and leak proof. The centrifugal design eliminates the need to prefilter the fuel for the pump's sake, and will not generate wear particles as there is no metal to metal contact taking place. Flow across an inactive pump is virtually unrestricted and average life expectancy is 40,000+ hrs.

Goglio704 · **Posted:** Tue Aug 14, 2007 6:10 pm

I think the Kennedy pump would be an excellent choice. The price is the only downside, but those who have them seem to be happy. I know cheap lift pumps can be grief in a metal can.

crdmike · **Joined:** Tue May 16, 2006 7:25 pm **Posts:** 138

Goglio704 wrote:

I think the Kennedy pump would be an excellent choice. The price is the only downside, but those who have them seem to be happy. I know cheap lift pumps can be grief in a metal can.

Installed it today. Bought it with the mounting bracket which made the job easier. Removed the DS rear seat to gain access to the dark blue wire with orange tracer under the carpet.

litton · **Posted:** Tue Aug 14, 2007 6:54 pm

I don't know what the price is but this is no place to go cheap.

crdmike · **Joined:** Tue May 16, 2006 7:25 pm **Posts:** 138

litton wrote:

I don't know what the price is but this is no place to go cheap.

http://www.kennedydiesel.com/

Lift Pump-Dmax

$195.00

Mounting Bracket for Kennedy Lift Pump-Dmax

$25.00

my jeep has factory wiring for a lift pump!

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