Fuel pump turns on, swaped relay, checked fuse. It cranks but won't start, like its not getting any fuel. I checked the valve to see if it gets fuel and it comes out very little. My jeep started before I replace this fuel pump. Any ideas? this is the 2nd fuel pump.

I pour fuel down the throttle body and the jeep starts. Doesn't stay turned on thou. fucked up POS.

did you check the fuel filter?

replaced it a month ago.

[QUOTE=toadies]My jeep started before I replace this fuel pump. QUOTE]

if it started BEFORE you replaced the pump......then why did you replace the pump, just curious.

is the pump in the gas tank?

[QUOTE=toadies]My jeep started before I replace this fuel pump. QUOTE]

if it started BEFORE you replaced the pump......then why did you replace the pump, just curious.

is the pump in the gas tank?
yes its in the gas tank. The pump started doing irregular fuck ups. My jeep would start bogging down when I try to gas it, make a popping sound when I did try to gas it and not getting any fuel.

Turn the key to the on position and bleed off the air at the check valve. Did the pump go out by it's self or did you run the tank really low. If you ran it really low, that's what killed it. My dad did it like 4 times in a couple of months, we got to the point where we could take the tank out in under 10 minutes. :D

is th pump running? i just fixed the wiring on one cause the split tubeing chafed some very suttle hole in , mabey all the movement finaly broke it.

is th pump running? i just fixed the wiring on one cause the split tubeing chafed some very suttle hole in , mabey all the movement finaly broke it.

I'm going to get a volt meter and check the wires to see if i'm getting voltage, Also going to try and reverse the polarity on the motor. I'm stump, I don't think its running.

I turned the key to on position I pulled one of the gas lines out and no gas came out. I also press the check valve and very little gas came out at the start. But nothing if I press it again.

We also had this problem. It could be the Crank Position Sensor. In our case it ended up being the PCM, but the CPS can definately cause the symptoms you're describing. Good luck. It was a nightmare on our end and we finally turned it over to the dealer after we pretty much knew it had to be the PCM. Figured if it was the PCM we wanted them to put it in so that they can replace it if it goes out again. We had less than 50K miles on the Jeep. Sucks to have to shell out that kind of money to get the thing running instead of buying more toys, tho... anyway, here's the thread with a few ideas... http://www.pirate4x4.com/forum/showthread.php?p=4230345#post4230345

Oh, one other idea, did you replace the entire sending unit or just the pump? When we did get the PCM installed and we had "spark" again, there still wasn't enough fuel pressure coming from the pump. We let the dealer install another pump and returned the one we had purchased. The pumps from Chrysler come complete with the sending unit for about $250. We could have just gotten a bad pump, though.

Again, good luck.

Tami

First off, check your fuel pressure on the rail. Its should hold a constant 36-40psi. If it does your fuel pump is fine, if it dosent then replace the fuel filter....they CAN get clogged in just one month and they are only like $7. If that dosent do it then check to see if the fuel pump is shorthing out inside the tank (thats also a common thing with after market fuel pumps). You may also want to check your engine codes, it might be a CPS....however most of the time it will start after sitting for a while.

Ok thanks for the info. In futher research I found this.
I'm getting only 6volts to the fuel pump. The Black is positive and the Red is Negative.
I ran a new line from the battery + to the fuel pump and grouned the negative to the red wire and get the pump turned on. Even go pressure out of the fuel rail.
I am getting 12 volts out of the relay circuit. I jumped the relay and still only gettin 6 volts.
I pulled the relay and fuse and still shows 6 volts. How is this possible?

Ideas?

We also had this problem. It could be the Crank Position Sensor. In our case it ended up being the PCM, but the CPS can definately cause the symptoms you're describing. Good luck. It was a nightmare on our end and we finally turned it over to the dealer after we pretty much knew it had to be the PCM. Figured if it was the PCM we wanted them to put it in so that they can replace it if it goes out again. We had less than 50K miles on the Jeep. Sucks to have to shell out that kind of money to get the thing running instead of buying more toys, tho... anyway, here's the thread with a few ideas... http://www.pirate4x4.com/forum/showthread.php?p=4230345#post4230345

Oh, one other idea, did you replace the entire sending unit or just the pump? When we did get the PCM installed and we had "spark" again, there still wasn't enough fuel pressure coming from the pump. We let the dealer install another pump and returned the one we had purchased. The pumps from Chrysler come complete with the sending unit for about $250. We could have just gotten a bad pump, though.

Again, good luck.

Tami

Uhhh that sounds bad. Fuck.

Fuel pump turns on, swaped relay, checked fuse. It cranks but won't start, like its not getting any fuel. I checked the valve to see if it gets fuel and it comes out very little. My jeep started before I replace this fuel pump. Any ideas? this is the 2nd fuel pump.

WHAT YEAR JEEP AND MOTOR ?

WHAT YEAR JEEP AND MOTOR ?
92 Cherokee 4.0L 167k miles

are you getting 6 volts at the connector for the fuel pump ?
high resistance in the wire ( partial short to ground or almost broken circuit )
run a new wire, or trace it back and fix the corrosion .

are you getting 6 volts at the connector for the fuel pump ?
high resistance in the wire ( partial short to ground or almost broken circuit )
run a new wire, or trace it back and fix the corrosion .
There is a connector to disconnect the fuel pump wireing under the back driver side fender well. The wires goes up in side the jeep. I tested the wire there and was only getting 6volts.

Ok thanks for the info. In futher research I found this.
I'm getting only 6volts to the fuel pump. The Black is positive and the Red is Negative.
I ran a new line from the battery + to the fuel pump and grouned the negative to the red wire and get the pump turned on. Even go pressure out of the fuel rail.
I am getting 12 volts out of the relay circuit. I jumped the relay and still only gettin 6 volts.
I pulled the relay and fuse and still shows 6 volts. How is this possible?

Ideas?

YO' DUMBASS IT'S NORMAL THAT THERE'S ONLY 6VOLT'S AT THE PUMP, IT GOES THOUGH A BALAST RESISTOR THAT DROPS THE VOLTAGE DOWN. THESE PUMPS NEVER GO BAD MORON!!!! THE FUEL LINE COMES LOOSE AT THE FUEL PUMP. DEPENDING ON WHAT FUEL PUMP THEY HAVE U BYPASS THE RESISTOR BUT THAT WOULDN'T KEEP IT FROM STARTING. TRY MAYBE THE COIL WHICH IS JUNK OR THE CRANK SENSOR THAT FAILS ON A REG. BASIS. IF YOU DON'T KNOW HOW TO WORK ON IT, MAYBE U SHOULDN'T TRY TO FIX IT. KIE KIE!!!

YO' DUMBASS IT'S NORMAL THAT THERE'S ONLY 6VOLT'S AT THE PUMP, IT GOES THOUGH A BALAST RESISTOR THAT DROPS THE VOLTAGE DOWN. THESE PUMPS NEVER GO BAD MORON!!!! THE FUEL LINE COMES LOOSE AT THE FUEL PUMP. DEPENDING ON WHAT FUEL PUMP THEY HAVE U BYPASS THE RESISTOR BUT THAT WOULDN'T KEEP IT FROM STARTING. TRY MAYBE THE COIL WHICH IS JUNK OR THE CRANK SENSOR THAT FAILS ON A REG. BASIS. IF YOU DON'T KNOW HOW TO WORK ON IT, MAYBE U SHOULDN'T TRY TO FIX IT. KIE KIE!!!
Wow, not eveyone is a master tech.

The jeep will start if I pour fuel in to the throttle body. Why do I always get a constant flow of 6 votls even with out the relay and fuse?

YO' DUMBASS IT'S NORMAL THAT THERE'S ONLY 6VOLT'S AT THE PUMP, IT GOES THOUGH A BALAST RESISTOR THAT DROPS THE VOLTAGE DOWN. THESE PUMPS NEVER GO BAD MORON!!!! THE FUEL LINE COMES LOOSE AT THE FUEL PUMP. DEPENDING ON WHAT FUEL PUMP THEY HAVE U BYPASS THE RESISTOR BUT THAT WOULDN'T KEEP IT FROM STARTING. TRY MAYBE THE COIL WHICH IS JUNK OR THE CRANK SENSOR THAT FAILS ON A REG. BASIS. IF YOU DON'T KNOW HOW TO WORK ON IT, MAYBE U SHOULDN'T TRY TO FIX IT. KIE KIE!!!


I'M SORRY....I'M READING THIS THREAD AND NOT LIKING IT WHAT U HAVE DONE MIGHT CAUSE MORE PROBLEM'S THEN GOOD........ :shaking:

Wow, not eveyone is a master tech.

The jeep will start if I pour fuel in to the throttle body. Why do I always get a constant flow of 6 votls even with out the relay and fuse?

THAT'S DUE TO THE BALAS REISTOR, IT DON'T MATTER IF THE RELAY IS THERE ON NOT........ IF U HAVE A NEW STYLE PUMP IN IT THEN U NEED JUMP THAT RESISTOR, SO THEN YOU GET 12V THERE!!!!

THAT'S DUE TO THE BALAS REISTOR, IT DON'T MATTER IF THE RELAY IS THERE ON NOT........ IF U HAVE A NEW STYLE PUMP IN IT THEN U NEED JUMP THAT RESISTOR, SO THEN YOU GET 12V THERE!!!!
wanna give me a start where I could find this resistor? or how it went out?

the ballast resister is in by-pass mode in the start position. Anything else i'm doing wrong?

Now Take The Orange With Black Tracer Wires Off Of The Balast Resistor And Splice Them Together. Then The Balast Resistor Will Be By Passed. Then You Should Have Tweleve Volts At The Pump During Cranking And Run Position. Fyi, Even If The Filter Was Plugged The Pump Would Put Out Enough Pressure To By Pass The Blockage, Until The Pump Burnt Up. How Much Fuel Pressure Do U Have??? 35psi. Is Spec.
THE RESISTOR IS ON THE DRIVERS SIDE FENDER, IT'S WHITE AND ABOUT 3 INCH'S LONG. NEXT TO THE AIR FILTER HOUSING.

nevermind

Now Take The Orange With Black Tracer Wires Off Of The Balast Resistor And Splice Them Together. Then The Balast Resistor Will Be By Passed. Then You Should Have Tweleve Volts At The Pump During Cranking And Run Position. Fyi, Even If The Filter Was Plugged The Pump Would Put Out Enough Pressure To By Pass The Blockage, Until The Pump Burnt Up. How Much Fuel Pressure Do U Have??? 35psi. Is Spec.
THE RESISTOR IS ON THE DRIVERS SIDE FENDER, IT'S WHITE AND ABOUT 3 INCH'S LONG. NEXT TO THE AIR FILTER HOUSING.
I found the resister. The wires were green. I connected them and still got 6volts even with the wires disconnected the reading was still 6 volts. The reading on the resister was 1.1ohm

nevermind
FIX???

I found the resister. The wires were green. I connected them and still got 6volts even with the wires disconnected the reading was still 6 volts. The reading on the resister was 1.1ohm

THAT'S THE RIGHT ONE...CHECK THE PLUG WIRE AT COIL. MAKE SURE IT'S NOT BURNT

yeah the pumps do go bad, I'm replaced two of them in my 89 XJ. and quit yelling.

Check the filter, you can also pull the line off the filter and when you turn the key the pump should spray fuel out the line, if not the pumps not working.

CPS would only be if you are not getting spark.

spark plug wires have been replaced a year ago. The jeep does start (when I pour fuel in the throttle body). Are you talking about the starter coil?

weasel: The pump works. I connected a wire straight from the battery to the pump and it turned on and getting pressure. Only getting 6 volts (contionous) out of the wires.

I think did more harm then good cutting the wires from the start. I should of took off the fuel pump to switch the wires. The 2 wires are grouned. Running a continuity test shows they are touching each other. I am also able to read the 6 volts just touching one of the wires on the fuel pump and connection to the purple wire.

Here is what i'm looking at.
http://web2.airmail.net/~coy/Image022.jpg

So my guess when connecting the wires back i shorted something out inside (How?) and messed up the PCM maybe? This sucks.