Well, the above wasn't necessary since I wasn't pointing fingers. The issue I believe having consulted with a few folks is your lift pump. They are simple to rebuild.

Sorry for the panicked defensive response Greazzer.

Hi everyone, got the spring installed and while there was some air in the system, it wasnt nearly as much as yesterday. Spring works great.
First impressions : Much quicker throttle response. There used to be a slightly delay between pressing the throttle and anything happening. Now it almost feels like an electronic throttle!
As far as performance goes, I cant say yet since I spent most of the drive home in traffic but 0 - 30 seems peppier. I am happy either way.

Turns out my hand primer pump is ruined. It leaks and has been dripping fuel when idling since last night. I guess it was on its way out and me opening it was the last straw. Going to check lift pump and replace hand pump tomorrow.

Big thanks to Greazzer for the spring and all the help.

Only a few left at this point.

Thanks again everyone.

Hi there,

I'll take one thanks.

Adrian

p.s. it's for an MB140D van (OM662) - the bolt doesn't appear to be rebuildable, so can I please have the full setup thanks.

Back from the track. I changed too many things at once so I'm not sure what I learned.

I did bump the record to 100 .9xxx (I don't have the timing slip here in the house) from 100.1918. So a little better. I'm not sure I have the cam timed the way I need it but so far no big difference. The truck felt STRONG off the line and I'd sometimes get a puff of black smoke upon startup so I'm sure it's a bit richer than before - this makes me think the spring is doing it's job.

My next major mod will be a Dieselmeken pump. I'll check with Goren for optimum IP timing, etc. and we'll see which spring he recommends.

Dan

Good Deal Dan !

If folks want to order one of the last OFV springs, please PM me. Thanks.

Just had a thought, what happens if you simply used a standard banjo fitment and just put a basic adjustable fuel pressure regulator on the return line?

THANKS EVERYONE !

ALL SOLD OUT.

For those few folks who emailed me / PM'd me, I will re-evaluate selling these in early 2016. I need to think through some disclaimer language. So far, excluding one initial complaint, which turned out to be a thumbs up after some other repair items were discovered, I have received nothing but thumbs up. And to clarify:

The OFV spring is ultimately a maintenance item, and just like any other maintenance item, it needs to be replaced. After 30+ years, and a zillion cycles, that spring becomes worn and fatigued. It should be replaced regardless at some point to restore proper PSI within your fuel system. HOWEVER, the mod'd performance spring enhances that PSI which does in fact enhances performance. That is why the spring was designated as a performance spring -- because the specs from the original / OEM spring were slightly tweeked.

So, if other folks PM / email me as to the status, I will respond by asking folks to look at the thread (not trying to be rude or curt).

this weekend I installed the OFV spring on the w123, easy-peasy.

Also, I checked the valves and found 4 had tightened up from the last adjustment.

I am pleased to report a slight but noticable improvement in power.

Thank you for offering these for sale & I hope you continue to do so in the future.

Thank you Sir. I wish it made our cars a Porsche, et cet., ... but it does improve the peppiness by correctly increasing the fuel pressure.

Ah great first time I sign on in months and this is exactly something that I could use :(

PLEASE PM me if you end up doing more. I have an extra core I can send you if you need one.

Today I finally got around to look at my car to change the overflow spring.

Well, guess what, apparently my car doesn't have one!

According to the ondemand diagram, number 15 is the overflow banjo.

1st picture shows my actual car, and there's a crudely drawn "6" where the bolt should be.

My car is a W210 1998 E300TD, with OM606.962 engine. It's the one that uses a partially electronic IP.

Does this mean my car doesn't have one?

Sorry guys, I spoke too soon. Turns out the car DOES have a overflow valve......except it's on the OTHER side of the pump. And
i was able to verify that it was there.

Guess I'm taking off the intake manifold to do it. Not too bad of a job, but it's certainly different from the older om606 or om605 engines.

Yeah, they are on the back side of the pump, lift pump is on one side, the overflow with the banjo fitting on the other. Pump needs 1 bar of internal pressure.

As it turns out, my overflow valve is the non-rebuildable one. :(

Anybody knows where I can source one?

Or does one of those Dodge Cummins overflow valve on ebay work?