dkred94z

Hi there, Is there a fuel relay or circuit breaker for the 1994 z28. If so where would it be located and are they prone to overheating and not working right?? thanks in advance for your help.

bw_hunter

Yes, there is a relay. It's located under the dead pedal to the left of the brake pedal. It's a black plastic box...you'll see it. And no, they aren't prone to failure.

If you have an INOP pump, scan the PCM for codes... There are some that won't let the fuel ump turn on. You can also check for voltage at the connector under the car under the fuel tank...

dkred94z

ok thanks a lot, a problem with my z28 and someone told me to replace the fuel relay thinking it was under the hood

Injuneer

From Shoebox:

http://shbox.com/1/fuel_pump_relay.jpg

All years are the same.

There is a fuse for the fuel pump.... #5 at the end if the instrument panel (also supplies PCM). The fuel pump will not turn on unless it gets a signal from the PCM. At startup, the PCM gets a signal from the theft deterrent module (TDM) to enable the fuel pump.

dkred94z

sorry so late getting back with y'all - had to work. The reason for the question about the fuel pump relay is that I've got a 1994 Z28 that I posted about 6 or 7 months ago about it going down the road and it quitting and letting it set for about 10 or 15 minutes and then it cranks up and goes on. Everybody thought it may have been bad gas so I drained the fuel tank, changed the fuel filter and ran Seafoam through it. I don't drive it a lot because I say so busy. It probably had 3 or 4 hundred miles through it in the last 6 months, but occasionally still does it. This past Wednesday I pulled in somewhere to get gas and it wouldn't crank so after pushing it out of the way it set for maybe 20 minutes and It cranked right back up. A friend and another guy who owns a 68 camaero said the engine sounded fine - no problem with it and said it was probably something simple. Another friend mentioned a fuel pump relay going out. Right before it cranked I was sitting on the car waiting on it to set I heard a click in the dash like a circuit breaker or something resetting. Right after that it cranked up like a new one. Then I let it run about 5 minutes while a couple of people looked at it - I cut it off and then it wouldn't crank. I let it set for about 5 minutes then it cranked right back up. Didn't have any more trouble. My son and I drove it the next day with no problems whatsoever and the car was driven again today with no problems. It's a small town so it's where you cannot get up to highway speeds. Any help would be appreciated. Sorry for the length of this. Thanks a lot.

Injuneer

Previous thread for reference.

https://www.camaroz28.com/forums/lt1...riving-882961/

At that time you indicated replacing the fuel solved the problem.

I will still suggest you scan if for codes. If it's a heat soaked ICM, might set a code. Or a heat soaked Opti cam position sensor module. Don't necessarily turn on the SES light.

dkred94z

at that time it didn't quit but I drive it a few miles every 2 weeks or so.i need to scan it but I checked around at auto zone etc and they only do 96 and up. so I may have to buy a scanner. I works nights and sleep in the daytime so its hard to do anything the engine runs great but the shuting off problem gets me. thanks alot

shoebox

Explain what you mean by "crank". Do you mean the starter engages and turns the engine (that's crank) or you get no starter engagement when you turn the key (no crank)? Sometimes people use the term crank when they mean start. It is important to clarify for troubleshooting.

dkred94z

the engine turns over fine. but after a about 5 to 10 min wait it starts fine and runs good. this last time it seemed like the battery was getting run down(its a new battery) and after the click noise I heard from the dash area it it started like I had just put a new battery in it.

Injuneer

Get a scanner? Have you decided not to try the Scan9495 software?

You need to answer Shoebox's question, so we know what "crank" means to you in post #5. "Turns over" is also used interchangeably by people to mean the starter engages and cranks the engine but doesn't start, or by others to mean the engine starts to run.

dkred94z

why the question of the scanner? is that the one available here I looked at months ago. that takes a cord to connect to the car.i thought I answered the questions when I go outside to start the car I turn the key and I starts like a new car.... sometimes I can drive it for 10 to 30 min. going down the road and it will stop running like I cut the key off. I can turn the key and the engine will spin over but will not start. after from 5 to 10 or 12 min. I will turn the key and it starts like new car again. but last time it took a little longer and the click I heard from the dash told me try it again and instarted right up. I haven't heard the click noise before because I am usually checking for loose wires and such. last night I drive the car for about 20 min. and had no problems at all. I hope this helps.... this is from a desktop pc.... no laptop available right now. thanks for your help

Injuneer

Scan9495 = Free scan software, needs a cable. You can buy one ready made, or build your own for 1/2 the cost. A data log using software is far more valuable than screen shots or copied data from a scanner. And I offered to review a data log for you.

I only asked because I suggested it in the other thread, and did not know you had decided you didn't want to have to buy a cable.

In my mind you didn't answer Rob's question clearly. I'm only trying to help you here. My apologies if you feel your answer was adequate. I'll leave that up to Rob.

shoebox

When it cranks and won't start, you need to check for good fuel pressure and spark. You are also at a disadvantage because you don't have a way to scan for trouble codes. Some important codes that could be related to your problem don't turn on the check engine lamp.

dkred94z

its not buying a cable it working long hours and no laptop to plug into the car, I appreciate the offer to look at the log from the software. yall have a lot of more experience with the lt1 than me .i do appreciate you all trying to figure it out.