LongIslandMax

1990 Maxima ; I just replced the fuel pump and i hear it workin but i can't get it to turn over. Where do i start to find the problem??one thing i noticed that the security light is blinking, would that prevent it from starting { it is cranking}. I am trying to fix it for a friend. any suggestions would be great!!

 

Matt93SE

are you getting fuel pressure?
stick a gauge on the incoming pressure line and see what it looks like.

if the fuel pressure regulator has failed, then the pump can work all day but the car won't start.

90pearlSE

If you are sure you connected the fuel pump correctly, I would start by checking out the 2 relays in the trunk by the DS taillight (fuel pump relay & safety relay).

LongIslandMax

How do i check a relay to see if its good?

maxima_92se

The only way to check a relay is by replacing it. There should be a box of electrical relays under the hood on the driver side.

 

royson345

My 89 Max had the same problem when I first got it. Turns out the radiator had to be replaced and the low coolant was causing it not to start. Other than that I don't know what could be the problem. Just check into it.

Kindfiend

I agree about the fuel pressure regulator. The pump gets blamed a lot for no start conditions, but sometimes it turns out it was the regulator. Check fuel pressure, I'm not sure what psi your car runs on. If the security system was engaged, the car wouldn't crank. Don't spend your friends money needlessly, make sure you know what's wrong before fixing shit. I know I've spend money on a distributor I didn't need, but when your car isn't running you get desperate!

Edit: I thought of something else, an easy thing to check. Take the plugs out and squirt some oil in the cylinders, it may be flooded and not getting compression. Just a thought, and all you have to pay for is the oil (and every one of us probably has oil lying around somewhere).

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Kindfiend

01 Sentra GXE
92 SE-R

Matt93SE

how would a flooded engine not have compression? that makes absolutely no sense at all.

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Kindfiend

The unburned gas washes away the oil, no oil means no compression... I could be wrong, I don't claim to know everything.

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Kindfiend

01 Sentra GXE
92 SE-R

saharacactus

Check the fuel pump relay aswell it is in the trunk on the inside of the lid.They usually don't fail but check it anyway.

 

Matt93SE

no oil means more engine wear, which means possible low compression.
no compression is what happens when there's a hole in the piston.

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