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Fri Oct 03, 2025 5:48 am

The van is home and I had a little time to take a little better look this morning. What is this sensor and where does it go? Also I noticed that the vacuum hose from the fuel pressure regulator is missing, where does that run to? Sorry, I’m going to order a Bentley manual this week to prevent some of my stupid questions.

Fri Oct 03, 2025 6:30 am

coolant temp sensor. goes into the thermostat housing.

Fri Oct 03, 2025 8:01 am

You don't need the Bentley to get started. This is available for free, with updates:

https://oldbluesblog.com/files/DigifantProTrainingManual_SingleSided.pdf

When I had a vanagon, one of the best things I did was go through the entire testing procedure outlined in this. You can't get a better orientation to the operating systems and you can establish a baseline for where things are now.

Fri Oct 03, 2025 8:09 am

mikemtnbike wrote: You don't need the Bentley to get started. This is available for free, with updates:

https://oldbluesblog.com/files/DigifantProTrainingManual_SingleSided.pdf

When I had a vanagon, one of the best things I did was go through the entire testing procedure outlined in this. You can't get a better orientation to the operating systems and you can establish a baseline for where things are now.

print two copies of this guide. leave one in the bus, NEVER REMOVE it. you will thank yourself later.

Fri Oct 03, 2025 8:42 am

If your not sure of something and need a side by side comparison, give me a buzz, I'm right down the road in Perkasie and the dog and I need a reason to go for a ride every now and then.

Bob C

Fri Oct 03, 2025 8:44 am

x2 for the D’fant training manual…keep it under your pillow. 8)

You need a short vacuum hose to the intake plenum, almost directly under the FPR…you’ll find a nipple waiting there:

- Dave

PS: Not my pic…not my fuel hose clamps.

Fri Oct 03, 2025 9:57 am

The blue sensor is temperature sensor 2. It is for engine management. The black sensor #1 is for the coolant temperature gauge. The blue sensor should connect to a blue plug. The blue sensor should be on the left side of the plastic thermostat housing.

Fri Oct 03, 2025 10:13 am

That missing vacuum hose on the fuel regulator, dont use vacuum hose.
Instead use fuel injection hose, high pressure hose, and then hose clamp both ends on tight.

You see if in that regulator's rubber diaphragm fails, high pressure unregulated fuel will gush into that vacuum hose. That can be near 70 psi or so. If that is a wimpy made for vacuum use only hose, it can burst, or be blown off the ends do to the high pressure fuel. Then high pressure fuel sprays all over your alternator, spark coil, distributor, and perhaps some other electrically ""energetic" apparatus. This failure of the Regulator Rubber Diaphragm can be responsible for engine fires.

Use a high pressure fuel hose, both ends clamped.

This way the fuel leak is contained and safely sent to the intake, where the engine will then stall from over rich mixture. That in turn stops the fuel pump.