I have changed my fuel pump twice already on my 82 Z28, once stock and once high performance, and each time I have to drop the fuel tank. I just purchased a 91 RS for my son, and the fuel is not reaching the throttle body. The fuel pump does go on (I hear it) and the fuel filter has been changed. I am thinking it is a faulty or clogged fuel pump which means I will be dropping the tank again. Has anyone come up with an easier way, perhaps cutting a window out on top of the fuel pump location ? Any help or pics would be greatly appreciated.

 

The access door has been done many times. I have done it myself. The only downside to doing this is that you will have to cut and splice the fuel lines.

https://www.thirdgen.org/forums/tpi/...fuel+door+trap

 

That is not a problem, I am assuming that they get reconnected with rubber fuel line hose's with hose clamps, correct ?? If so, how is this accomplished ? What should the initial cuts be made with ? Approximately where should the cuts take place and how big ? What should the fuel lines be cut with ? Sorry for so many questions, but just want to do it right the first time. Is it possible to post some pictures ? Thanks.

 

OK, at least one answer please, what should I make the cuts with ? On the body and the fuel lines ?

 

I don't have any pics from me doing mine. Someone else will have to post them or you will have to do a search for them. There are 4 lines, 2 actually circulate fuel and the other two are vents. I used rubber hose and clamps on the 2 vents since they have no pressure. The pressurized lines I used some sort of brass fittings which work great, the name escapes me right now. To cut them use a little tool that holds a hack saw blade. The last thing that you want are sparks. Cut the fuel lines somewhat in the middle of what you can see.

On the body I used tin snips so that sparks wouldn't go everywhere and burn up my interior.

 

This is the exact same problem I'm having on my 92 RS..fuel pump primes, fuel filter has been changed (today)..but still no fuel getting to the TBI. Guess the next step is a new pump. Auto Zone told me it was my distributor after I told them I was able to spray starter fluid into the TBI and get it to run as long as I kept spraying it. Ya, I had the same WTF look on my face too.

 

What would a Distributor have to do with fuel not getting to the throttle body ? As soon as you turn the key to the "ON" position, the fuel pump goes on thus creating pressure in the fuel lines sending the fuel to the destined point (throttle body). Just goes to show that if every one were to listen to someone from Auto Zone, the forums would overflow with problems !!

 

She told me that the distributor wasn't sending a signal to the injectors ...strange, I see no electrical connections between the disty and the TBI. She said her husband had had the same problem on one of his trucks..and did what we are doing..fuel filter, pump, etc..and it ended up being the disty. Until a mechanic tells me that is what will fix it, I think I'll hold onto my cash

 

I tested the voltage to the injectors and they are both reading fine. If you come up with something, let me know.

 

I had the same problem. I could hear the fuel pump, but it ran like crap. I checked the fuel volume 18 ozs in 15 sec, then checked fuel presure 18 psi. So I dropped the tank and pulled the pump out. The rubber hose that connects the pump to the steel line was to long and had pin holes in it. Didn't know how old the fuel pump was and sence it was hard pulling the tank I replaced it.

 

My 89 RS did the same thing.
I started dropping the tank, but it was cold, then found that my car was going to sit for a year, so I put it back together.
Went home, saw that the track was going to be open, so I used a hammer and chisel to cut the "floorboard" out. I didn't really make so much of a trap door, as I just bent it up to get to the fuel lines.
I took the pump/sending unit out, (as far as I could) then very slowly, cut all 4 lines with a hacksaw, so I didn't throw and sparks or heat the lines to much.
Once I had it all apart and back in the tank, I used 4 rubber hoses and 8 hose clamps.

General rule of thumb, don't use rubber lines on fuel injection, but on a TBI, the pressure is not great enough to need metal lines. However if you have the time and are willing to spend a little more money, putting a fitting on will last a lot longer then a rubber hose.

Also be careful when cutting the floor board. The tank is very close to it.
If you start at the back of the seat in the center of the car, about halfway to the "lower" portion of the trunk, that is where the fuel pump is. I'm sure you already know but the lines go from the pump straight forward, so cut the back and sides first.

I am sorry I don't have any pic's, I was in a hurry at the time and didn't think about it.

Other then that just be careful.

 

Well, I just ran across this, and I think it's what you were looking for, so here you go.

https://www.thirdgen.org/forums/fabr...cess-door.html

 

all you need is a leak and some time. With that your third gen will get it's access hole with no time, and no cutting required.

On more serious note dropping the tank is better solution than cutting the access door. After you cut it, then need to figure out how to secure it and seal it.

 

Dropping the tank isn't that big of a deal.I've prolly done it around a dozen times and never thought of hacking the car up.On my future stepson's GTA the person gave it to him after they hacked their way into the top of the tank then decided that they didn't want to cut the lines.So another member of this board and I showed him the right way to do it and patched the hole while the tank was dropped.And people on this board wonder why 3rd gen owners are looked down on.

 

Hack away, use steel braided line to patch lines back with double clamps.

If the line wants to kink, put a hose clamp in that area to make it stay round.

They finally installed an access door in 02 and then canceled the line.

Not mine but here are pics.



I did a much nicer job but no way Im dropping all that crap to change the pump. Car should have an access pannel.

Folks on here will say the car will fall aprt if you cut the metal back there but them same folks said my rear shock tower brace doesn't do anything cause it so strong back there.

 

Unplug one of the injectors and connect a test light to the plug. Crank the car and see if the test light flashes. It should be pulses. If no light,theres a problem. One of the most common issues, is the ignition module that is located under the distributor cap. The wire breaks or they go bad. I had the same problem on my 92 RS.

 

So will the ignition module cause no fuel to reach the injectors even though the engine cranks over ???

 

The ignition module on a TBI car has a pickup coil in it that sends a signal to the ECM to pulse the injectors.

 

But what does that have to do with fuel traveling from the tank to the injectors ? I have no fuel coming out of the tank through the fuel lines to the injectors.

 

I thought you said you were having fuel coming out but it wasnt reaching the Throttle body? The ignition module controls when the injectors spray fuel. If you have fuel coming out of the tank then through the lines to the Throttle body, the fuel will stay in the throttle body until the injectors are told to pulse.

 

Sorry I didn't explain more thorough... my problem is the fuel pump turns on (I can hear it) but no fuel comes from the pump to the throttle bodies. I cracked the fuel lines open and no fuel is in the lines at all.

 

Any feedback ??

 

If someone can reply to this it would be greatly appreciated as I need to know what part to buy... the fuel pump or the ignition module or ???. Getting ready to go to the auto parts right now. Please HELP .

 

If you hear the pump but get no fuel, its something else, plugged filter, or line on the pump, inside the tank are lose or............

Maybe the pump is bad, still, they do just have plastic gears.

 

It sure is something else... and in my case it was the small inch rubber hose connecting the fuel pump to the sending unit. It literally melted and the strainer disintegrated . See pic...

 

THey probably drove the car around on E all the time. The gas is what keeps them pumps cool. Not good to let them get under a 1/4 tank.

I run some marvlous myster oil in the gas ever so often for it, give the pump a bit of lub.

 

How much of it do you put into the tank and how often ? Is it safe ?

 

So did you cut an access hole?

 

Sure did.

 

Oh I put it in ever 3-4 months, a whole small bottle to a tank.
Even if the tank isn't full.

 

hmmm not showin that I posted............

 

OK , here's a brief summary of events... made fuel pump access door, repaired fuel pump, replaced ignition module, replaced cap and rotor. Fuel is now reaching up to the throttle body, but won't come out of the injectors ?? The car cranks over no problem, but will not start due to no fuel coming out of the injectors. Please help .

 

Does the car have VATS? When you turn the car on does the security light on the dash blink?

 

you may also want to check the fuel pump relay on the firewall near the brake booster. I had the same problem in my car except it would finally start after about 30 secs of cranking

 

Don't half *** it. Just drop the tank. If you've already done it twice in one car whats the big deal to do it once more in another car? If the engineers would have wanted a hole in the trunk pan to get access to the fuel pump they would have deisgned one in. You're just asking for structural problems and a place for water to get in and another place to rust (if you're up north). Just do it right.

 

UUHHH... a bit to late there buddy. If you checked earlier in this thread, you would have seen that project is already completed a few days ago. And its nowhere near half *** !!! Project turned out real nice, cleaned up the cuts and made access door where changing / upgrading the pump takes about 20 minutes as opposed to 3 hours!! And a correction on your behalf, engineers didn't exactly think of everything when building this car, if they did, there wouldn't be a need for after market products and customization and improvements done by many people on these forums.

 

I for one,disagree on the cutting of the metal lines.Yes,it might work for now but how long will that hack job last?

 

2 years and counting on mine, I did use double hose clamps on each end but since its just a splice and the metal line is still very close, the rubber line is plenty strong and will last 10-20 years, like any rubber fuel line.

 

No need to disagree, I for one am not trying to convince you or anybody else here to "hack" as you say, your car up ! I am simply posting something that worked out GREAT for me as well as many others.

 

might wanna see this thread

https://www.thirdgen.org/forums/body...ound-heat.html

thinking of using some of that in the back and on the roof.
Though will probably leave the spot right over the FP open, So I can hear it working hehehehehehehe

Think Im gonna go with the cheap smitty stuff, looks just as good and they are not trying to fund racing events, aand that wh y ithink the rest cost so much.

Like godaddy, theeir prices are getting higher and higher and nuts on some things. So they can put pretty girls in race cars. Not on my dime. Slowing moving to namecheap

 

If you still aren't getting fuel out of your injectors they possibly could be clogged. But if absolutely no fuel is coming out of any of them I'm guessing not.

 

since you already cut the access door and cut the line, how did you connect them. when i did mine i flanged the ends and put compression fittings on. i would try to undo the fuel line and turn on the power for a brief period of time very brief, possibly get some one to do it while you are in the back holding a rag. if you have fuel coming out of the pump, then it is good. just because you hear the pump running doesn't nessasarily mean that it is working. next i would dissconect the feul line at the front of the car and see if turning it on with rear connection hooked back up, and see if you are getting fuel to the front of the car. i had a friend nice enough to jack my car up for me and crush my fuel lines so it cant hurt to check for a faulty line