jrd Posted June 6, 2007 Share Posted June 6, 2007 Hi All, I had posted here several weeks ago about problems I was having with getting my megasquirt working on my L28. I am having surging problems, but I have since decided that this is not due to the megasquirt but must be due to something else. In order to convert to megasquirt I had to swap to a '75 Z fuel tank and fuel pump and replace my fuel lines. I think that something is wrong in that swap. Here is the problem. As my fuel level decreases the car starts to surge worse and worse. When the fuel gets pretty low it is so bad that it is almost not possible to drive it. I cleaned out the tank before I installed it, so I don't think that it is rust. Could this be a fuel filter? Or a pressure regulator? I used the stock fuel rail and regulator from a 79 ZX... Any ideas? Thanks, Joe Quote Link to comment Share on other sites More sharing options...
Clifton Posted June 7, 2007 Share Posted June 7, 2007 When ever I have a fuel issue, I Tee in a cheapo pressure gauge between the regulator and fuel pump and run it up to the wiper blade to hold it. Just leave the hood on the second latch and see what it does when driving. Quote Link to comment Share on other sites More sharing options...
mario_82_ZXT Posted June 7, 2007 Share Posted June 7, 2007 Sometimes when you clean an old tank of rust it reveals pinhole leaks in the pickup. I think that's the problem with mine, when I have less then half a tank the pumps sounds noisier and the car cuts off when it hits boost. Also, recheck the fuel filter(s), and the lines might be full of crap too. Mario Quote Link to comment Share on other sites More sharing options...
z-ya Posted June 7, 2007 Share Posted June 7, 2007 When ever I have a fuel issue, I Tee in a cheapo pressure gauge between the regulator and fuel pump and run it up to the wiper blade to hold it. Just leave the hood on the second latch and see what it does when driving. Exactly Clifton. I do the same thing. JRD, it looks like you have some crud in the tank, and the only way to tell is if it holds pressure under load. Quote Link to comment Share on other sites More sharing options...
jrd Posted June 7, 2007 Author Share Posted June 7, 2007 Just replaced the fuel filter and it still does it. I will T in a cheapo fuel pressure guage and go from there thanks for all the input. Anyone ever notice that it is not possible to simply do an upgrade and have it work right the first time or is it just me???? Quote Link to comment Share on other sites More sharing options...
jrd Posted June 7, 2007 Author Share Posted June 7, 2007 I cleaned out the tank before I installed it. I guess that there could still be crud, but it looked good to me! Would a bad regulator act this way???? Joe Quote Link to comment Share on other sites More sharing options...
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