Quote:
Originally Posted by Paul Workman
 Excellent post, Marty.
Here in the "People's Republic of Illinois", except for scattered racing fuel outlets, E10 is "the order of the day".
So, (wondering out loud) how much of that rusting is due to the ethanol? (Retorically speaking) |
If this car just had gas from 1990 in the tank, it shouldn't have had any Ethanol in it. But thast not likely the case.
The big problems with Ethanol come when a vehicle/device, has been run for some time, then all of a sudden it gets a dose of Ethanol fuel.
Ethanol is hygroscopic(attracts and absorbs water) while gasoline is hydrophobic(repels water-although the following study shows that water can still be absorbed into E-0 or 100% gasoline. And that the E-10(10% Ethanol gasoline-which was advertised as E-10, but actually measured out at E8.3-E8.8 across 3 confirmatory tests) can absorb water at the rate of about 3 tsp/gallon. There are products that can help.
https://cropwatch.unl.edu/documents/...2009052014.pdf
So basically if I had a vehicle with 100,000 miles on it and filled up the tank with E-85(85% Ethanol) if there was any water in that tank, it probably wont be there for long.
Whenever GM went to the newer injectors in the LT5 is when
for the 1990 LT5 Ac/Delco is now making a new injector under their "Professional" series of products.
1990, 1991 and 1992
p/n 19239663 Delco p/n 2173407 if for a Primary US$58.79
p/n 19239662 Delco p/n 2173406 Secondary US$63.79
These new Professional series injectors are also listed for the 4.5 liter Cadillac Allante engine.
then for 1993-1995 only the OEM injectors are listed, GM p/n 17109952 Ac/Delco p/n 217280 and Rock Auto only has 1 available.
Rock Auto also has the dual pump sending unit for the 1990-1995 LT5 cars under "ACDelco Fuel Tank Sending Units 19180770" for US$278.79 and Summit Racing also has them for US$370.97. Amazon for US$299
The 1993 and up ZR-1s should be fine for E10 usage.
If this car does have a fuel contamination issue, the fuel filter will show that, but it probably has been changed. It would be cool to cut the original open and check out the filter media.