Need help with PPR assembly ID and o-ring. "pictures"

[JIMJAM]

Car has a history of hot start issues but after 2 back to back dist changes from John some 5 yrs ago, it appeared to be solved. Then this week it came back and now the car will not hold pressure for 30 seconds. This is using the old tap the fuel meter plate method.
On earlier fuel dist I have replaced many a o-ring but apon opening this never open fuel dist from John, I not only do not recognize the assembly but the size of the o-ring vs the Vitons is confusing me. I do not recognize it and the rubber o-ring is HUGE compared to the #75 Viton 1.9x3.8. Not only do I not recognize it as being 1 of the 2 versions, but how the hell does the o-ring come off?
The plunger swivels and retains the smaller spring but something needs to come off to replace the o-ring. Yes it's a hail mary as the o-ring other than appearing huge looks to be free of any defects but often for the Delorean it is worth a try.
Any help appreciated.

EDIT----- After staring at pics I think this is a early ver and apon looking inside the dist I can see what I ASSUME is the front part with a 2nd -oring. I can pull on it slightly with a small jewlers screwdriver and it moves slightly but will not come out. Before I attempt to try again to retrieve it I will stop until I am dam sure what it is AND some ideas on how best to get it out.

[Ron]

Dig deeper...the piston is still in there (with o-ring).
57732

[JIMJAM]

Hey Ron.....
It's a longshot but a good 1st thing to check. Magnet didn't work and I did not like trying to drag it out but it is pretty snug.
The car started to really jump up in temp just over 220 so I burped it via the t valve by the radiator. Then on a test drive to a DR only a short distance away, after sitting 30 minutes it did not want to start. Classic hotstart bs. Got home and burped it again and then something made me take the air cleaner off and check the fuel pressure.
And here I am.... IIRC the accumulator was replaced 5 or so yrs ago. Probably only driven it a dozen times in the last 6 mo because of the heat.
REALLY thinking hard about selling it and getting a Stingray. Maybe 3-5 yrs old.

[Ron]

Did you get it out??

I usually pull them out with a pen magnet. Sometimes I have to work it in and out a bit...

[JIMJAM]

I have always had a issue with pulling out.
Supposed to be 200 degrees again but if we have a good thunderstorm I might get that little sob out and HOPE that O ring is the issue.
Always amazed me that something so small can cripple the entire car.
BTW- If anyone in the future reads this and needs a Viton feel free to contact me. I have 50. Or the above picture is of the bag with the # and size you need.

[Bitsyncmaster]

If the small O-ring on the "piston" is not viton, it will swell and make it very hard to get the piston out. As a last resort to remove it, you can probably prime with the fuel pump with the large assembly screwed back in the FD without the spring installed. I've not tried that method since I have always been able to pull it out with some small tool.

[JIMJAM]

Always good to hear from you and once again thanks for your replies. It is very hot again even in the shade with a huge fan but I will attempt it again today. It sure would be nice if it was a damaged o-ring both causing the problem getting it out and the sudden loss in pressure and related hot start issues.

[JIMJAM]

After some creative swearing I got it out but unfortunately the 0 ring in my eyes looks fine. Other than being more "pliable", next to new Vitons you cannot tell a difference.
Notice the "wear" which to the eye resembles left over glue residue after removing a sticker. It appears to be very fine wear that cannot be felt by your finger but obviously appears to be from rubbing. BTW-The pictures it appears as rust be that is a result of the lighting. There is no rust color seen by the naked eye.

Not hopeful replacing the copper washer and the o-ring will solve anything but here goes...

[Bitsyncmaster]

I would install your know good viton O-ring anyway. You never know what they installed with rebuild of the FD.

[JIMJAM]

Just ran the car approx 10 miles at 60 mph and the temp gauge was right on 220. Not above or below which considering it is 94 is normal for this car.
Anyways, just parked it left in the sun at 2:30 and getting ready to try and start it.


A unexpected 40+ minute call made me wait longer than I wanted but after 1 hr sitting in the sun the car started 1st turn. Motor had of course cooled from it's earlier run but seeing that it is 95 outside in direct sunlight that is prime condition for any hot start issue.
The last 2x this issue happened earlier this summer on VERY hot 100 days sitting on blacktop a simple short blast of starter fluid did the trick. Of course the true test is to park in a distant parking lot just before rush hr or dark. THATS when you really find out if it is truly fixed. Bottom line is Deloreans hate summer.

[Bitsyncmaster]

You can test your rest pressure time now at any temperature. But if it started quickly after one hour then you must have fixed it.

[JIMJAM]

I will find out soon enough if the Viton did the trick.
Now I need to figure why my car is getting up to 220 fairly quickly.
All I have done is a recent oil change. Did a all over general look see and did do some cleaning under the engine and trans with spray cleaner and then wipe. I have auto bleeds at both ends and did burp the front t one by the rad and did get some air out. Later I ran the car to temp with heater on and repeated it.
Don't know what others temp hovers at when it is 95 outside with the a/c on but as a general rule I do not drive it over 90 unless for short distances. Also who knows how accurate the gauge is?

[DMC-81]

Hi. I had a similar situation as my old PPR O-rings looked fine visually. But changing them solved my hot start problem. I had already replaced the fuel accumulator and I'm running Dave's solid state RPM relay.

Here's a picture of my old and new:

http://dmctalk.org/attachment.php?attachmentid=37115&d=1443911266

[kings1527]

Probably best to consult some overheating threads at this point but I'd first check your coolant level if you haven't already (gotta mention that...sorry), but also a good possibility your thermostat isn't functioning. Or a physical blockage in your cooling system. This is all providing your fans are coming on as expected, normally and as you turn on your AC to max, too.

[JIMJAM]

I replaced the radiator myself some years ago with a improved one along with better fans "Toby"that do not use as much power. Also have the fan sequencer Cool something or another.. Dig rpm relay....
Visually checked and both fans are running and come on. IIRC the therm is one that comes on a little early. As I said I use iirc Toby's bleeders at the tank and at the radiator. SS tank, new hoses, no leaks detected. Any car will run hot during these type summers but I don't recall the temp jumping up this quickly and especially sitting ON the 220 line which is really what gets my attention. Rarely drive it over 85 or 90f but I will be watching it carefully.

BTW to the post with the pic of the assembly and o-rings. I have already replaced the front small viton but how do you get the larger rear off? I did not spend much time trying to figure it out nor do I have a replacement but how and where did you get it. DMC?

[kings1527]

I replaced the radiator myself some years ago with a improved one along with better fans that do not use as much power. Also have the fan sequencer Cool something or another.. Dig rpm relay....
Visually checked and both fans are running and come on. IIRC the therm is one that comes on a little early. As I said I use iirc Toby's bleeders at the tank and at the radiator. SS tank, new hoses, no leaks detected. Any car will run hot during these type summers but I don't recall the temp jumping up this quickly.

I'd turn my attention next to the thermostat and make sure that's doing its job. $25 replacement part with gasket, if need be, and an easy install.

[JIMJAM]

Thanks for your reply. I will find out fairly quickly if my hot start issue was resolved or at least helped with the o-ring replacement. The temp issue is very common for all my exotics but the D is especially known to hate the summers here. The a/c while working as good as it gets is just good enough to keep you alive. A fair weather car to say the least.