i have a 88 iroc 305 tpi and one day i pulled it out of the barn to give her a wash and it wouldnt start back up. it seems to be something with the fuel it would start then die. so we replaced the fuel pump( it wouldnt prime ) after the pump was replaced it still wont prime. so i said ok maybe its the fuel pump relay.... replace it and still nothing... help please. any input will be awesome thanks guys!

 

nice looking car

Have you tried any kind of starting fluid? Or even spraying fuel into the throttle body just to see if it will start.

 

Are you checking to make sure these parts are bad before replacing or just spending money? Check to see if the relay is clicking on. If its not then you need to find out why its not clicking on. The ECM should be controlling the pump driver. There should also be an oil pressure sending unit that'll shut the pump off if there isn't enough oil pressure. I'm dealing with a similar issue now myself, good luck.

 

ok thanks. and im gettin the parts for cheap. my brother works at advanced. but keep me posted on how yours orks out and ill do the same for you guys.. still more advice would be great.. thanks again.

 

My '91 RS 305 TBI (127k miles) just died on me as well. I'm pretty sure it's the fuel pump. I turn the key on and hear the fuel pump relay for 2 seconds, but I don't hear the usual hum of the pump coming from the rear. I also checked the 20 amp fuse and it is good. I read in my service manual that in order to change out the pump, you have to remove the fuel tank. To do this, you must also remove the rear axle as well as the exhaust. Is this correct? If so, anyone done this and can it be done at the house?

 

I just replaced the fuel pump on my 91 RS 305 TBI. It wasn't really all that difficult, but I do have a nice garage, floor jacks, jack stands, and air tools. It took me about 2 hours to do it all.
To drop the tank, you do have to drop the rear end, and the exhaust, but they don't have to come all the way out. I disconnected my exhaust at the cat, and swung it out of the way (exhaust tips towards the passenger side. I removed my lower shock mounts (as well as the sawy bar end links, and the panhard baralong with the brace. I dropped the rear to where the brake line is tight (but not too tight!) and was the able to remove the tank.

88iroctpi..I too am still haveing a problem with starting my car, and I haven't figured it out yet. It started with a bad fuel pump (for sure, as I had no fuel pressure) Now I have fuel, my injectors are firing, and I have bypassed the Vats. Every now and then the engine will catch while the started is running, but the engine won't run. I had to go overseas so I haven't worked on it for a week or so, but I plan to work on it this weekend when I get back to Texas.

 

kmdracer,

Thanks for the quick reply . I don't have the air tools, but I do have everything else. I'm going to give it a try this weekend. Are you an experienced gear head or just a weekend warrior? Two hours seems pretty quick.

88iroctpi,

On my '91, there is a 20 amp fuse on the passenger side fender, just aft of the battery. Have you checked that yet?

 

no i have not checked that yet. i just removed the alternator because it tested bad.

 

ok so i just check the fuel pump fuse.... and its bad.lol. well got new pump and relay installed tho.lmao hopefully that will prevent it in the future.haha

 

So you are all good now 88iroctpi305? I'm back home now but havent had a chance to look at mine yet. I did notice that since it rained cats and dogs while I was gone, I have about a 1/2 inch of water inside the drivers side rear floorboard. Gonna have to figure out where that leak is coming from now!

 

lol well actually no. im not good now. new fuse new relay new pump new alternator new battery and still no prime???? what could be the problem??

 

I had to replace the computer to fix that problem :/

 

I just got back from a day on the bay fishing and taking the kids to the beach. So a quick question for ya. Do you have a multimeter (DMM)? If you do, have you measured to see if you are getting power to the fuel pump/sender plug under the car, near the tank? You have to measure to ground. One of the wires is the fuel pump 12v signal, one is the ground, and one is the fuel level signal. I don't remember which is which right now, but hopefully if I have time tomorrow, I'll look in my schematics and let you know.

 

ok sounds good. and my new fuse is blown too so maybe a ground or a bare wire?

 

Yeah, I'd say you have a wiring problem if your new fuse blew. I'd say most likely a short to ground, wither in your Oil prssure switch, fuel pump relay or your fuel pump.

Sounds like it time for you to get some schematics out and a DMM to find the short.

I haven't messed with mine much lately, been too busy working or fishing.