Cat C7 will not start, low cranking fuel pressure. - ASAP Oct 09, 2014Cat C7 will not start, low cranking fuel pressure. This info is taken off the fitting on the filter housing/primer pump. During cranking it will speed up like it wants to start but no fire. hello I have a cat c7 acert in a school bus at my shop engine warning light comes on after its been running a while. I checked with scan toolYour engine should maintain a fuel pressure between 65 and 85 psi. This code will occur when the ECM detects pressure below 20 psi. If it is low, I..Yes there is. The only way to test would be to plug or restrict the fuel return line coming from the engine. If the pressure goes up and the engine..70 PSI is plenty of fuel to start the engine. Does the yellow check engine light come on when the key is turned to the on position?Are there any other codes other than the 94-11? Do you have a service tool to read the ECM?Since the fuel pressure came up to 70 psi and it still did not start. I would next want to see how much injection actuation pressure you have while..I see. It remains above 870 PSI before the engine will start. Is it staying above 870?I see. When it comes down, does it go below 870?That is why the engine will not start. There are 3 things that will cause this to happen. The first is a faulty Injection actuation pressure senso.. C7 fuel filter swap went w/o a hitch! - iRV2 Forums Dec 06, 2014Once the filter started spinning it came off w/o issue. Lubed the new seal & spun on the new 2 micron. Again, once this filter was off NO FUEL draining from the housing. After the filter was installed I pulled the plug on top of the housing and filled the filter with about 3 cups of diesel till she was full. Replaced the cap and started the CAT.