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Yes, but you certainly need more then a few tank-fulls to get an accurate reading. At many pumps, it''s impossible to truly fill a diesel tank in a Blazer or pickup. The factory filller neck is too small. They pump diesel too fast an load it with air, causing it to foam. All depends on the...

There are many ways to do it. Use an aftermarket universal tach sender box to enable any gas engine tach to work. By a tach that works off the alternator stator. Some alterators already have built-in taps for hooking tachs to. If not, you just pull it apart and tap in. By a tach that...

27-30 MPGs defies reason and physics. No offense, but I don't believe you. Maybe you actually believe those figures - and if so, I have no idea why. I've met with a few people that made such claims and every one I had a chance to check, got nowhere near those figures. If you DO actually...

The only engine I know of that shared anything with the 6.2 diesel, is the old V6 Toroflo GMC diesel 478 c.i. engine. It has the same stroke as the 6.2, but shares no parts. They do both use the Ricardo Comet disesl precombustion chamber design (I think). After the disaster GM had with...

I towed a 3000 lb camper trailer for 5000 miles with a 6.2 diesel Blazer with a T400 trans and 3.08 axles. Overall fuel use average of 13 MPG and on many steep hills my top speed was 35 MPH. This was a full height camper trailer with lots of wind drag. The wind drag is a bigger factor then...

If you can get some B20 bio-diesel, it's likely to loosen varnish as well as anything - in the injectors. I just doubt varnish is your problem. It will also eat up old return fuel hoses unless they are Viton. Like I said, the 6.2 uses pintle injectors. Each uses one big self-cleaning...

Note that I am NOT a 6.2 diesel basher. I own over twenty 6.2 powered vehicles and have been working on them, and driving them since they were invented. That being said, the 6.2 is a light-duty, low-torque diesel engine . It uses a rotary distributor-type injection pump that is the WORST thing...

I doubt you've got a "fouled" injector . . . and there is no such thing as "hardened" Stanadyne injection pump. Many diesels use injector nozzles with multiple small holes that ARE subject to plugging. The 6.2 does use that type of injector. It uses a "pintle" injector with one large...

The water pump has one sealed ball-bearing assembly in it. It dries ou slowly, gets play, and eventually gets so loose that the water-seal starts to leak. If, with the belts off, the shaft turns smooth and has no play - you've got nothing to worry about. Good for at least another 0K miles and...

I buy where ever the best deals are. Right now, RockAuto has new Bosch nozzles for $13.25 each. Part # 0434250898 . Last year I bought 40 new nozzles from them at $3.75 each (a much better deal). 1991 CHEVROLET BLAZER Diesel Fuel Injector Nozzle

Those DNO numbers are Delhpi from China or India. CAV, Bosch and Lucas are all part of one big company in Europe. In the USA, there used to be an American Bosch (AMBAC) and there still is Stanadyne (Roosamaster). AMBAC was a German Nazi supporter and got all its US assets siezed. In...

It's a easy check. Just put a vacuum gauge on it, run the engine and see if it draws 21" of vacuum within 30 seconds. That's all there is to it. Note that is the proper reading at sea level. It will read lower, the higher your altitude. At 15,000 feet, it should read only 12" of vacuum...

That valve design got changed late 80s, to address cold starting problems. "New" valve is GM # 10149645. Stanadyne # is probably # 15830, but that might of changed too. For the DB2 pumps used in GM 6.2s/early 6.5s, and Ford-International 6.9s and early 7.3s - there are only two choices. #...

Who the heck cares about 2009 and newer engines and what they need to be emissions compliant? We ARE talking about 6.2 diesels, correct? New engines don't have rotary fuel injection pumps to crap out from low lube, but they DO have catalytic converters that suffer from some fuel additives...

So have I and was fooling with other diesels 20 years before that. My experience with the 6.2 is different. The 6.2 was originally designed to make equal horsepower and torque as a 305 gas engine - but with better fuel mileage. Thus it was built very light, by diesel standards. Also has a...

I guess much depends on what is available locally, cost per gallon, and how cold the temps are. From all real tests I've read, two-stroke oil easily beats B20 when it comes to cost per tank. But, I have no idea what you pay for B20. Stanadyne calls for fuel with lube that permits a metal...

You can use any viscosity oil as long at it meets the needs for the temps you start and run in - as long as it has a SF/CD rating or better. In 1986, GM recommended as the "best choices" being straight 30W for temps 32F - 100 F. 15W-40 for 0 F to 60 F, and 10W-30 for temps minus 30F to 60F...

It was a common problem with 80s trucks with 6.2s. Fuel drains back a bit towards the tank. Filters stay full, but you wind up with some air in the line. Truck starts fine, then quits. Once running awhile, it is fine until next it's parked for awhile. I aleardy posted the GM service...

I've cleaned many with zero problems. First not any solvent will destroy that diaphram. Second - there really isn't any need to tough the rubber part of the diaphram. The steel disk in the center of it is what does the sealing. You can reach in with a long Q-Tip to clean it, or - just pry...