No fuel coming out of injectors

[MonkeyFella95]

Then connect a fuel gauge on your system and test the pressures. You should see 60-75PSI with the valve closed on the fuel pressure tester.

One place to look at is the fuel accumulator. Pull the small hose off the end of it (leave the two larger connections alone), some fuel should come out from there, that's normal. If you have another piece of hose that is the same diameter, slip it over the nipple of the accumulator and point it downwards into a pail. Jump start the RPM relay to get the fuel pump going. You should see some fuel come out of that nipple for a few seconds and then stop. If it does not stop and it is coming out like a garden hose after about 5 seconds, then the diaphragm inside the accumulator is damaged and it needs to be replaced.

Also, did you pull all the injectors off, jump the fuel pump, press down on the flap and see if fuel is coming out from the ends of the fuel inject hoses? If so, was fuel coming from all of them?

I've replaced the fuel accumulator with a brand new one after this issue started so it's not the accumulator. Yes pulled all the injectors off and get good flow out of all of the hoses.

I'll update on Sunday after I've done the pressure test

[MonkeyFella95]

Okay so measured the control pressure, cold obviously as I can't get the engine to run.

On the first run the pressure was 1.5 bar which is too low obviously which I knew it would be given the injectors aren't opening. Pressure was no different with the valve closed or open which is to be expected with the engine being cold. The second test I did it was 1 bar and on the third, and every time I've tried to test it since, it was 0. No leaks anywhere and I could tell that fuel was still getting to it because fuel came out when the release valve was pressed, just not enough pressure to register on the gauge. Through this the pump noises have got worse and worse.

I turned to testing the pressure directly out of the pump and it wouldn't get any higher than 2 bar so I know there is an issue with the pump and that needs to be replaced.

It doesn't explain why the fuel line exploded before, but my working assumption currently is that there was a blockage in the accumulator that's since been replaced that caused the pressure to build up. And the only reason my FD and injectors "worked" before I replaced them was because the FD had the pin stuck in the fully open position and the injectors were also leaking at lower pressure.

If anyone else has a different interpretation of the results I'd be interested to hear them but I'll put in an order for a new pump next week.

[dmcman73]

Okay so measured the control pressure, cold obviously as I can't get the engine to run.

On the first run the pressure was 1.5 bar which is too low obviously which I knew it would be given the injectors aren't opening. Pressure was no different with the valve closed or open which is to be expected with the engine being cold. The second test I did it was 1 bar and on the third, and every time I've tried to test it since, it was 0. No leaks anywhere and I could tell that fuel was still getting to it because fuel came out when the release valve was pressed, just not enough pressure to register on the gauge. Through this the pump noises have got worse and worse.

I turned to testing the pressure directly out of the pump and it wouldn't get any higher than 2 bar so I know there is an issue with the pump and that needs to be replaced.

It doesn't explain why the fuel line exploded before, but my working assumption currently is that there was a blockage in the accumulator that's since been replaced that caused the pressure to build up. And the only reason my FD and injectors "worked" before I replaced them was because the FD had the pin stuck in the fully open position and the injectors were also leaking at lower pressure.

If anyone else has a different interpretation of the results I'd be interested to hear them but I'll put in an order for a new pump next week.

Do you have the original pump setup or the new GM all in one pump? If you have an original setup, the pump could be bad or the fuel line going from the inlet of the pump in the tank to the filter at the bottom of the tank is either kinked or it split open which would explain your fuel pressure issues.

[MonkeyFella95]

Do you have the original pump setup or the new GM all in one pump? If you have an original setup, the pump could be bad or the fuel line going from the inlet of the pump in the tank to the filter at the bottom of the tank is either kinked or it split open which would explain your fuel pressure issues.

I have the original pump setup. Would quite like one of the new ones but DeLorean Texas is out of stock and the DeLorean industries one is $600.

I did think of that as I?ve heard other people having that issue. The baffle in my tank is gone and the filter screen is at the end of a short hard hose that has it just about touching the bottom of the tank, not an ideal setup but the hose is definitely not kinked and I can?t see any cracks in it so I?m fairly sure it?s the pump itself.

Either way I?m going to get a baffle and a proper hose with a stainless spring insert to replace the hacky setup.

[dn010]

These pumps are not all that expensive, just search 0 580 254 909 fuel pump. I think I got mine on Amazon, got two of them actually just to be safe. I'm also still using the original setup with the "updated" (hardened) weird pickup hose going to the baffle, I don't use a spring inside mine and it has been fine for decades. I'm sure you can find a baffle setup easily from someone who converted otherwise you can find everything at D-Go.

[MonkeyFella95]

These pumps are not all that expensive, just search 0 580 254 909 fuel pump. I think I got mine on Amazon, got two of them actually just to be safe. I'm also still using the original setup with the "updated" (hardened) weird pickup hose going to the baffle, I don't use a spring inside mine and it has been fine for decades. I'm sure you can find a baffle setup easily from someone who converted otherwise you can find everything at D-Go.

I meant it would be nice to have one of the new all in one style pumps like 107000 from DeLorean Texas. Good to know the part number but DeLorean GO it?s a similar price and I feel like I owe them after wrongfully blaming their FD 😅

[dn010]

I know what you meant, all I was trying to say is that the original setup, although for some can be finicky at times, works just fine. Let us know how what happens with the new pump installed.

[MonkeyFella95]

Sorry for the delayed update, it’s been a very hectic month. I’ve installed the new pump and baffle and it works and the engine starts! So it was the pump the entire time.

My profound apologies to DeLorean GO for blaming their FD. I really should realise that it’s far more likely I’ve missed something than a professionally rebuilt part isn’t working.

Engine running the best since I’ve had it now, although still not running quite right. While cold it gets close to stalling unless I rev it a bit and when warm, although stable, it idles at about 1000RPM. More investigation needed but it’s such a relief to see it running again and no more smoke out of the exhaust or an overwhelming smell of petrol like before. Thanks everyone for your help!

[AugustneverEnds]

Sorry for the delayed update, it?s been a very hectic month. I?ve installed the new pump and baffle and it works and the engine starts! So it was the pump the entire time.

My profound apologies to DeLorean GO for blaming their FD. I really should realise that it?s far more likely I?ve missed something than a professionally rebuilt part isn?t working.

Engine running the best since I?ve had it now, although still not running quite right. While cold it gets close to stalling unless I rev it a bit and when warm, although stable, it idles at about 1000RPM. More investigation needed but it?s such a relief to see it running again and no more smoke out of the exhaust or an overwhelming smell of petrol like before. Thanks everyone for your help!

Bravo! Glad to hear you solved your problem and it wasn't too terrible.

You had your fuel distributor rebuilt, how about the control pressure regulator (warm up regulator)? If it's original and hasn't been rebuilt that's where I would start looking.

[David T]

Bravo! Glad to hear you solved your problem and it wasn't too terrible.

You had your fuel distributor rebuilt, how about the control pressure regulator (warm up regulator)? If it's original and hasn't been rebuilt that's where I would start looking.

Since you installed a rebuilt F/D did you properly adjust the mixture screw? The rebuilder can't set that for you, it must be adjusted on YOUR running car. You could also have a bunch of small air leaks that must be fixed before you can adjust the mixture properly. You could also have a problem with the CPR. Best way to figure that out is to get a pressure gauge on the fuel system and watch the pressures as the motor warms up. If it has been a long time since the last tune-up, you may need one. Same goes for the O2 sensor and the valve adjustment.