I have a 1993 Jeep Grand Cherokee with fuel system problems please help! - JeepForum.com
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post #1 of 5 Old 10-01-2012, 05:10 PM Thread Starter
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I have a 1993 Jeep Grand Cherokee with fuel system problems please help!

When i drive my jeep down the road and i hit the accelarator it starts to bog out then the engine starts going then bogs til i let of and drive slow. i cant get over 40 mph. I believe its the fuel pump bit im not sure. can anyone help. i recently changed the fuel filter so i know thats a good part.

And what fuel pump would i need? i have a pump that my dad found that i dont know if u can run it. it puts out 90 pounds of pressure. Is this safe to put in.

Im a novice jeep owner. the jeep was passed to me after my brother/mechanic passed away and i have no clue what im doing on it and i need help

Thank you

Rye-man is offline  
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post #2 of 5 Old 10-01-2012, 07:07 PM
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1996 ZJ 
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Before spending too much more money on it, buy seafoam from wal mart.or any car store for about $10 and put half the bottle in your carb while the jeep is idling, but pour it slowly, if you pour too fast your engine will shut off, once you pour the first half turn it off for about 10 minutes, and put the other half in your gas tank, then crank it and rev the engine until it stops smoking. This will clean your fuel injectors,.fuel lines, carb jets, any carbin build up and a few other things. Try that and see if it helps, i have a zj that was doing the same thing, and it helped me.
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post #3 of 5 Old 10-01-2012, 11:08 PM
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The cat is most likely clogged.
Are you getting a CEL ?
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post #4 of 5 Old 10-01-2012, 11:10 PM
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Originally Posted by Rye-man View Post
And what fuel pump would i need? i have a pump that my dad found that i dont know if u can run it. it puts out 90 pounds of pressure. Is this safe to put in
Is it a proper ZJ-compatible pump, or just some random pump?

If you think that your pump is the problem, then surely the first thing you need to do is check your fuel pressure. Rent or buy a fuel pressure gauge and hook it up to the test port on the fuel rail. The FSM (factory service manual) for the 1993 ZJ says this:

Fuel pressure should be approx 31 psi at idle.

While idling, disconnect vacuum line from fuel pressure regulator. Fuel pressure should rise to 39 psi. If it does not rise approx 8-10 psi after disconnecting vacuum line, replace fuel pressure regulator.

Switch off engine, and record reading on pressure gauge. Leave engine to sit with gauge connected for 30 minutes and then compare reading with that previously taken. A drop of up to 20 psi within 30 minutes is acceptable, but if it is more than that, then pressure is bleeding past either the fuel pump check valve or the fuel pressure regulator.
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post #5 of 5 Old 10-02-2012, 12:28 PM
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1993 ZJ 
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check for codes with the key trick. without starting turn the key on - off - on - off - on and wait. The codes will flash from the check engine light. They are 2 digit number codes. Each digit will be followed by a slight pause, and each number with a slightly longer pause.

Post up the codes and we'll help from there.

93 red ZJ 190k 4.0. Spent more money than I should have ...

Isn't red the only color a vehicle should be?
If at first you don't succeed, use more speed.
LordHobbit is offline  

1993 , fuel pump , grand cherokee

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