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Tested with my old untouched presupply pump with 130k miles on it I had like 10%less overflow volume. Or to give an example. This August I had some fuel with ~50% gasoline in my car. After I went shopping (I drove the car for 1hour before) the car would not start when I wanted to leave after 20min shopping because of vapor bubbles in the fuel system. 1. cranking 2 seconds long - nothing happened 2. cranking - after 5 seconds I already heard a few cylinders reporting for duty and stopped I did wait 5 seconds 3. cranking - after 5 more seconds the engine ran, not nice, but it ran. And after hitting the gas once the idle was normal. What I want to illustrate with the example, the overflow volume is still quite sufficient. Even with the wrong fuel. :D Quote:
Diesel fuel canīt be compressed and so it does not store any pressure. The spring in the presupply pump can store the pressure so to say. If the spring in the presupply pump is too strong the pump stroke is finished earlier through the bigger spring force, but the time until the pump-cam loads the spring again is too long then. In that case the oscillating pressure can cause uneven fuel loading of the elements. I donīt say it will, but it can. Gruß Volker |
I guess I will try streching my springs and see,what happens
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I went to adjust mine,found no spring,now it won't start.
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Performance Overflow Valve
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What car? Engine? Sent from an abacus |
w126 1983 300sd>cracked injector lines,and fuel weeped out of them.
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If My primer pump worked I could bleed all air out.But Its been no good for 4 years.Guess I'll put my electric pump on it to prime it.
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When I put the engine in the 201 chassis, I used the electric fuel pump to supply the lift pump. I made a pressure regulator to control the pre lift pump pressure, that really made a difference on the top end fuel supply. The stronger pump spring makes the lift pump really want to pump a lot of fuel so I am able to maintain a high pressure with more return flow that OEM. I can see the pressure pulses being at a higher frequency if the return flow was restricted, (not allowing the piston to follow the cam and bouncing off the top of the lobe). I am running a higher volume bypass as well and my thinking is in order to have increased volume, the piston must be following the cam profile closer on the return side, so it could then be argued that the pump frequency should be lower that OEM.. All theory of course.. My goal was to increase fuel supply and pressure, pressure frequencies were not a consideration really, but worth keeping in mind should any strange performance be experienced.. |
what happens if spring and ball is missing?
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I think it would make sense for you to buy a new overflow valve and a new hand-primerpump :D Gruß Volker |
I will have to wait for tax refund time
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If you have any left and it will fit the M pump, I'll take one. Circumstances require me to remove the IP again so I'll install your valve while I'm at it. Do they come with new crush washers?
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So, I am now offering the following" $40 shipped BUT $5 refund if you send back your old OFV (assuming it's rebuildable.). I sort of feel bad delaying folks ... especially since my garage is a little disorganized. No aluminum washers. I think they are around .35 cents a pop. The refund has to be within 45 days of original purchase for PayPal to permit refunds OR I have to catergorize the transaction as a dispute. I prefer to avoid that. PM if interested. |
And yes, M pump is fine. I have a "M" pump on my OM617.912 and it has one of these little gems.
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I thought both springs were on the fuel filter holder.I checked both,but no springs.I was careful in case a spring shot out.
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