Quote:
Originally Posted by hudtud
Pulled my spring out and measured- 20mm- not bad I thought considering the mileage (219K). My engine has the shakes about 50% of the time when I come to a stop and leave it in D, put it in N and things smooth out. So I stretched the spring out to 24mm and no noticeable difference, but hopefully the IP is retaining a little more juice now. I still want to rebuild the lift pump and replace the plunger with the new style primer for peace of mind. I would also like to measure the fuel pressure before and after rebuilding of lift pump springs. Anyone try rigging up a gauge with a sending unit between the secondary filter and IP?
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Several people have with interesting results. They used a tee arangement with a dampened 0-30 pound mechanical glycerin filled gauge. No one has tried an electrical gauge with a sender yet that I am aware of. It has reciently been discussed though.
There is a more than fifty fifty chance your system is quite low in injection base pressure. This is based on no change at all after your relief spring stretch. If the internal base pressure in your injection pump cannot even reach a pressure that opened the relief valve under the pre spring stretch senario.
Certainly by changing the spring length nothing is changed. No or very little pressure has been proven to affect idle to some extent. Most spring stretchers almost always reported an improvement in idle. The ones that reported no change in any dynamic I felt probably had a very sub standard condition initially and still had it.
Anyways you seem to have trouble by what I can accertain from your post in your fuel supply. You really should get a gauge reading and procceed from there. You have everything to gain and nothing to lose in my opinion.
Let us know if you go this route and how things work out. We still need good examples posted for general information.