[Mgs] sputter

[Malcolm Jeffcock]

Hi all:

I have a 74 B that has a irritating problem. When at highway speed, not around town , I get this period loss of power, I thought fuel starvation or something related to ignition. It is especially prevalent if I am going up hill. It does happen on the flat and if I take my foot off the gas it sometimes helps when I apply the foot again. I changed the fuel filter thinking it might help and it did insofar as the frequency of these occurrences. I noted that it was much easier to blow through the new vs. old so I wonder about the fuel pump pressure. I don't have an SU but rather an after market low pressure pump as per the rating in our workshop manual...is there a method to test the pump?

Anything else it could be? Like I said I have fuel delivered to engine without trouble through all revs except if I am on highway with the revs at say 3k for a while and then try and accelerate-nothing. If going up hill I just lose power gradually to the point of needing to pull to the shoulder because I am a hazard...


Any helpful thoughts?  


Malcolm