James Que

Thanks dutchzcarguy and Jeff G 78 and Patcon for your support and directions. I will work through the information provided and update my results

This is very helpful. Thanks

Gotcha, have manual and have completed most of the possible checks on the electrical and emission. I will continue the research as you advised. Thanks so much.

I am back trying to start the 280 after almost a year off. Here is where I am: 1. The the engine to run without the injectors or fuel pump 2. Have replaced all relays related to the starting system. 3. Purchased an ECU and the resistor units. Have not installed yet 4. Fuel pump will not run through the system only when I do a direct connection to it only Question: 1. Should the injectors show continuity across the two connectors. 2. Any next steps to offer.

Also, I have ordered a fuel pressure guage to ensure the pressure is on point.

Thanks guys for the support. I got it to start once I realized the timing was 180 out. However, it only runs if I pour gas in the intake. I did a continuity check on the fuel pump relay and it test bad. Can't find one. Is there a temporary work around the relay? Thanks

20220730_210302.mp4 Back at again. Listen to the cranking of the engine and advise me of what's missing to keep it from starting. Also, at the start of video you will hear knocking from the engine, if you know where that come from or caused by will help. The plugs are firing and the firing order is correct. All other electrical compontents check out. Thanks

@Zed HeadI tried the starter fluid and it didn't respond at all. I will test the plug and squirt the oil in the cylinders. Thanks for the suggestions

This is the manuel section I followed to do the test. https://1drv.ms/b/s!AhGwIP-oI6Lc5DtsVXQSlaoxFFJw

Just recently started back working on my 78 280. Got the fuel pump running. However, the engine will not start. Did complete the test of the engine electrical system according to the manuel, pages 30-40. All power sources check good based on the voltage and continuity test. In my trials, i have not had backfire or any reaction from the engine. Please advise of my next steps to start the engine. Thanks, James Que.

@Mike. Thanks for you support with the pic and the option on the issue.

Great, I will try your suggestion. I got the jumper idea from a YouTube video. Thanks for your time and effort.

It doesn't run when I turn the key to start. It only ran when I used a jumper.

Fuel pump will not run. However, It will run when I jump across relay #25230. Please advise if there are other possible solutions to the problem. See picture of the relay. 20211011_171534.heic 20211011_171534.heic 20211011_171534.heic 20211011_171534.heic