ok so im having a problem starting my cherokee! it turns over it just wont start. the battery is charged and i have no idea what the problem is i ran it out of gas and i read some things about newer jeeps having a button on the passenger side floor but i couldnt find it on my 89iv also read about a procedior that you need to do but i have found nothing for mine so any help or advice would be helpful on what i should look for or do! thank you very much!!

 

can you hear the fuel pump humm?

 

the only button that would make sence would be a inertia fuel switch. but if you ran it out of fuel you probally just need to cycle the key a few times.

 

ya i can hear it humm and i have tryed to cycle it a few times but no sign of fuel at the schradder valve on the rail. we thought it could be air in the line...could this be the problem?

 

also i was wondering if there is another pump besides the electric fuel pump in the tank....is there a mechanical pump of any kind to push it up to the rail or is it just the electric one?

 

just the elec pickup pump as far as i know...send Blue a mesage he is into the Renix jeeps.

 

ok cool ill drop him a line! umm where is that inertia switch? its worth trying at least.

 

Here's a little something that might help. It's a pretty thorough writeup on diagnosing a no start..This might help out a bit.

http://naxja.org/forum/showthread.php?t=101119

 

the fuel pump may still make a hmm sound, but it could still be bad, theres a check valve in the pump that could be bad so it may not be holding pressure.

 

is there a way to check the pressure? and what is the PSI supposed to be?

 

just went through this....mine wouldnt start....check wires by your starter se.lenoid make sure all of them have a good connection. mine had one that was frayed and caused the pump to not work properly once i fixed that it fired right up. and this happend all of the sudden. just a suggestion.

 

i just had this happen on my jeep turned out to be a clog fuel filter

 

Fuel pressure on my 95 jeep grand was 39 psi, + or - 2 numbers...It went to 41 psi and did not drop below 30psi...

If it stays around 20 psi and drops no futher you are ok...

U must have a fuel pressure guage to check it...

The valve is located right over the valve covers on mine..I had to look real close to see the thing....

I had to borrow a fuel pressure guage from a mechanic nearby...Cost to much to buy one....Good to have friends that will help u out.....Good luck....!

 

you said 89 that mean it is mfi i do believe as in i have a renix jeep that you have a mechanical pump also since most cars now have efi and on inlines it says mfi just guess not 100% sure

 

Most parts stores will have a fuel pressure gauge you can rent.