measure the fuel pressure

You can find further service information here:
https://charm.li/Chevy%20Truck/1995/G%2 ... Diagnosis/

$5 or $20 doesn't matter if you have to change it every 30 years

Relay.
It's a $5 part so change it first.

@BHBVan
- Rockauto.com
- Junkyard
- Buy universal intake duct

Welcome to the forum.
Put a pressure gauge on the fuel rail and measure key-on pressure and leakdown.

Also, please post your questions in the Express/Savana section. Not Astro/Safari. Thanks.
(Your topic has been moved)

Please post your questions in the "G Vans" section. This doesn't belong in Astro/Safari. Thanks.
(topic moved)

Welcome to the forum.
Chop off a half inch piece of the your vacuum line and take it to the store with you

I think it might be easier from below

Welcome to the forum.

I would swap everything. But what's wrong with the '89 engine?

It should be coming on full blast. Try the troubleshooting here: https://charm.li/Chevy%20Truck/1999/Astro%20Van%202WD%20V6-4.3L%20VIN%20W/Repair%20and%20Diagnosis/Engine%2C%20Cooling%20and%20Exhaust/Cooling%20System/Testing%20and%20Inspection/Component%20Tests%20and%20General%20Diagnostics/Componen...

Hi welcome to the forum.
Does the fan run when the temp gets hot?

Look at all the options you used to be able to get.

then again, if it lasted 34 years then maybe they deserve a hand. It's a miracle by today's standards.

welcome to the forum.
tank straps tend to deteriorate quickly. Inspect their condition and have new ones ready if necessary.