Not fuel pump prime and no spark

[aaronswink]

Ok, first off want to say thanks to everyone who helped me on my other thread. This is hands down the best forum I have been on so thanks for all the support.
Now for my current problem, drove my truck down to the store to put gas in it, blew an upper radiator hose, got back home engine bay covered in coolant. Got a ride to replace hose, replaced it now the fuel pump wouldn’t prime, it would just turn over and over no start. Pulled out of relay and jumped pins to fuel pump, it came on so I tried to start with it jumped, no fire either. Replaced the ICM and still no start. I’m lost. The coolant had to have killed a very important sensor. Thanks for all the help and support. The truck is 2 wheel drive single cab 350 TBI 5 speed 91 model

 

[PlayingWithTBI]

Replaced the ICM and still no start

Check your ignition coil. I've had 2 go out, the most recent one would kill the engine when I went through the car wash, ha ha.

You can see the burn spot here. YMMV

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[aaronswink]

that wouldn’t kill the fuel pump too would it, or are you thinking the coolant ruined two things at once?

 

[Schurkey]

There's many possibilities, but when you lose spark and fuel pump, what comes to mind is the distributor pickup coil and it's magnet riveted to the mainshaft of the distributor, the distributor ignition module, or the wire harness between the module and the ECM. However, that shouldn't affect the fuel pump prime, just the after-prime fuel pump running when the engine is cranking/running.

Given the coolant bath, I'd be looking at the wire harness pretty closely. But don't ignore the other two. And make sure that all the fuses are good.

The first test is to connect a scan tool, and see if the ECM has an RPM signal when cranking.



RE-ROUTE your vacuum hoses. The big hose for the power brakes should go to the big barbed fitting behind the TBI, on the #6 or #8 intake runner. The PCV hose needs to go to the front of the TBI, so the fumes are distributed as evenly as possible to all eight cylinders, (Like your second photo with the stock intake manifold) instead of going to #6 or #8 and causing a lean fuel mix in that one cylinder, or going without PCV like your first photo. You NEED PCV to keep the oil free of moisture, and to reduce crankcase emissions into the atmosphere.

 

[PlayingWithTBI]

that wouldn’t kill the fuel pump too would it, or are you thinking the coolant ruined two things at once?

No, it wouldn't have anything to do with fuel (unless the ICM is not sending DRPs, Distributor Reference Pulses to the ECM), I was simply addressing your spark issue. Changing the ICM by itself isn't necessarily the answer IF you have other bad ignition parts, like @Schurkey mentioned the pick-up coil. If I'm gonna change the ICM I'm gonna change the Ignition Coil too. Testing the coil with an Ohm Meter will not show the bad spot I pictured, it'll test good.