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So I've been dealing with a somewhat confusing no start issue that i've narrowed down to the fuel/fuel injection system. For a few weeks the car would sometimes take 3-5 turn-overs to get started. I figured it was the fuel filter since it had never been replaced. I replaced it, but the problem didn't go away. Instead, it's gotten worse.
I've been emailing back and forth with Dave Barton (DaveBarton.com) about the issue, because I thought it might be a relay issue. I tried his jumper trick (running a wire from the red to red/yellow wire that connects to the fuel pump relay). The main pump runs (as it's audible) but I am not sure if the in tank pump is running for sure. I hear a hum in the fuel filler pipe and if I put my ear above the tank in the trunk, but can't verify if that isn't just the main pump as well. It doesn's turn over with this trick. However, the other day whilst trouble shooting, I tapped the relay, turned the ignition, the relay made a faint click and the car fired up. I ran it for a minute or two, shut if off, and started it back up fine, two times in a row. That faint click was the same thing I'd hear back when it would fire up after 3-5 turn-overs. Now it's back to no start...
Dave suggest I check the fuel pressure regulator, but didn't give much help except to find a used one and put it on to test it out. Not certain that its even the cause.
I've searched the forums for similar issues but haven't gotten too far. I've checked the fuses and they all seem fine. Not sure where to check next as I'm pretty confused... Any experience with something like this? Suggestions?
on a 240 that generation, pull fuse 4, and with the ignition off, take a jumper wire and run it from fuse 6 (which is always powered) to either side of the fuse 4 contacts. one side will power the main fuel pump, the other side the in-tank pump. I *think* its the left side for the main and the right side for the tank, but my 240 is now out of state with my college daughter.
the tank pump is quite hard to hear with a half tank or more of gas as its submerged. its easiest to hear with less than a quarter tank, and remove the gas cap and put your ear to the filler pipe while someone jumpers it, you should hear a soft pfpfpfpfpfpfp kind of sound.
I jumped the fuses (it's the right side of 4 for in tank pump). didn't hear anything at all... So I am guessing that the pump went out or perhaps there is a short somewhere. What would you wager? Any use looking for use pumps?
So I replaced the in-tank pump--wasn't too difficult, a bit tedious getting the float valve and filter out and into such a small hole. The filter was all torn up where it attached to the pump, everything else looked good.
Alas, still no start.
Any suggestions where to look? I'm going to go back to square one and check to confirm it is getting spark, fuel (pressure), and air.
The pump is working--I ordered through IPD. So I'm getting spark, fuel is getting into the fuel rail (haven't checked the plugs to see if theirs fuel on them, yet)...
Where is the best place to spray started fluid into the throuttle body? Not seeing any obvious area that would be easy to spray into...
Looked back at the FPR--the vacuum line is wet with gas and their is corrosion on that end of the FPR (where the vacuum line connects). I'm suspecting that it has completely failed and may be one of the main issues. Does that make sense, failed FPR causing no start?
Also, I've been reading about the 25amp fuse near the battery causing no starts--I see nothing in there. There's the headlammp relay and a small black plastic housing with a splitter inside (not sure of technical name) . No fuse in sight...
the 25A fuse powers your whole fuel injection ssystem including the pumps, so if the pumps are running, the fuse is good.
fyi, that black plastic box with all the red wires is the 'positive terminal'. the 25A FI fuse is usually somewhere near the power steering reservoir, its inline on a red wire attached to the battery (+) terminal.
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