Fuel Pump Not Firing After Rebuild
- Thread starter IBFJ62
- Start date
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Might be a silly question but did you remove the jumper? Steady flashing is no codes.
- Thread starter
- #23
With the jumper pulled, no flashing just a solid engine light in the 'On' ignition position. With the jumper, the engine light flashes constant, without breaks, but it's a short duration flash.
Possibly a bad ground connection??
Possibly a bad ground connection??
Pulled the EFI fuse to reset computer?
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- #28
I replaced the fuel filter just to be sure, and I'm getting pressure at the cold start valve, when I press in on the valve, fuel sprays pretty well. The odd thing, and I'm not sure if the fuel pressure regulator holds pressure until a certain point, but I'm not seeing fuel in the return hose...
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- #31
Agreed, there's plenty of fuel pumping out when you slightly press the schraeder valve at the CSI (as my neighbor found out last night while we were drinking a beer staring at the engine bay. He had a palm full of fuel right quick..) The only thing I can think of is that maybe the pressure regulator is locked closed?
I'll try to check the inbound fuel pressure this evening.
I'll try to check the inbound fuel pressure this evening.
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- #33
Ok, not sure what to think of this. I pulled the return line where it drops behind the AC bracket, and jumped the pump to get it humming along. With the pump running, I got barely a trickle out of the return. I let it run for a couple minutes, and just sort of a slow drip to slight flow. Several air bubbles came out, and when I took a socket extension and tapped on the FPR, it would kick out a sputter of fuel. Nothing big, but it definitely reacted to tapping on it. Plenty of pressure at the CSV. Unfortunately there's not a real convenient spot to pull the line upstream from the fuel rail on the inbound side to see what the flow looks like there.. will explore it further.
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- #35
Ok, I pulled the inbound fuel line at the filter, jumped it, and no question it's getting plenty of fuel to the filter. I was actually surprised how much it pumped in just the few seconds I jumped it. Which brings things back to the previous observation, of virtually no fuel getting past the fuel pressure regulator.. Normal or not??
Edit: I found this little tidbit in a post from PabloCruise several years ago, dealing with a no start issue..
"The bottom line is that I believe my problems were caused by a clogged return fuel line. I think the ECU was doing all it could to manage idle when there was almost double the specified fuel pressure in the rail. I am guessing the ECU had injector pulse width pulled all the way in.."
I'm thinking perhaps that's what's going on if that FPR is stuck closed. I know there should be pressure at the CSV, but I don't recall it being as high as it is now. I don't have a fuel pressure gauge, maybe a harbor freight run in my near future.., but it seems abnormally high at the valve.
Update. I pulled the fuel pressure regulator off, and just to see what's what, stuck a piece of tubing on the rail side port and tried to blow through it. Tried my best, but couldn't get any air to pass through.
Took 50psi at from the compressor to get the valve to open... Too much? I think I read it should be down around 38psi?
Edit: I found this little tidbit in a post from PabloCruise several years ago, dealing with a no start issue..
"The bottom line is that I believe my problems were caused by a clogged return fuel line. I think the ECU was doing all it could to manage idle when there was almost double the specified fuel pressure in the rail. I am guessing the ECU had injector pulse width pulled all the way in.."
I'm thinking perhaps that's what's going on if that FPR is stuck closed. I know there should be pressure at the CSV, but I don't recall it being as high as it is now. I don't have a fuel pressure gauge, maybe a harbor freight run in my near future.., but it seems abnormally high at the valve.
Update. I pulled the fuel pressure regulator off, and just to see what's what, stuck a piece of tubing on the rail side port and tried to blow through it. Tried my best, but couldn't get any air to pass through.
Took 50psi at from the compressor to get the valve to open... Too much? I think I read it should be down around 38psi?
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