Gas Tank Swap
 

I am finished my D15z1 swap swap into a 91 HF. It runs like a charm. I however would like to put a bigger gas tank in it. Does anyone know what other vehicles I can take one off of. Can I take one out of an accord or do I have to stick with 88 to 91 civics.

Some quick poking around on Rockauto.com shows that the other Hondas of that year appear to have very different tanks. Even the 4-dr & 3-dr civics used different tanks.

I seem to vaguely recall someone asking a similar question a while back(though I could be wrong) and the consensus was that there was no direct replacement. One option if range is a bigger concern than carrying capacity would be to add a fuel cell to the trunk. However that would require custom plumbing & wiring and an axillary fuel pump to either feed the engine directly or pump fuel from the cell to the stock tank.

I have seen posts where people have switched fuel tanks with other civics. I however wanted to go a little bigger. Part places usually wont list them as compatible if they are not an exact match.

not to be critical but how much range do you need?

I know that the VXs would routinely do 50+ mpg and even if the tank is only 8 gallons, that give you a range of 400 miles as a minimum and there are VX guys on here doing much better than 50.

at the same time, it would be cool to only fill up once evere thousand miles.

I want as much as possible. Within reason. The seventeen or 16 gallon on the accord seems real nice. I would settle with the 13 in a civic sedan.

If you go too large, the weight of the tank and the weight of all that gas will have a significant effect on your FE.

I got that. I don't think it will make much of a difference. Five or six gallons of gas isn't going to kill the fuel economy.

Probably not. I'm usually the first to dismiss the effect of that amount of weight on FE, but in a recent thread I was convinced that cars like yours are quite sensitive to it.

Having a passenger isnt quite affecting my FE, (150 pounds...).

And a question, isnt the 91 model lighter then a regular 92 vx (2100 pounds)?

Would you absolutely need an extra fuel pump for the trunk fuel cell? Gravity should do all the work, shouldn't it?

Yes they are lighter. A gallon of gas only weighs a little more than 6 pounds. An extra fifty or sixty pounds isn't going to make any difference. Besides the cost of the small amount I will be spending on gas will be offset by me not buying the inevitable mountain dew. I am not going to put gasoline in the car. One mishap and the smell would never come out. I just seems a little dangerous. Tanks are strapped on so I should be alright as long as I use the straps from the accord I take it off of.

I have a 11.9 gallons tank with my VX (coming from a DX probably) and I get like 625 miles and more (1000km).

So 13-14 should be more then enough...

Will an accord fuel pump being of a different size and pressure output matter if the crx pump doesn't just slide right in. I like the idea of a 90-93 accords 17 gallon tank if it's a direct bolt in or the 16 gallon tank from the previous gen.

I was mistaken, I thought your car already had a 12 gallon tank. Rockauto.com lists a 12gallon tank as the correct one for a 1991 Honda CRX HF, and says it cross-references with several civics. It is the same tank as the civic hatchback of the same year.

rockauto.com is kinda cool, for most parts you can look at a picture of the particular part, and they will tell you every other car that part fits on. I had been looking at both model numbers and the pictures of the tank shapes when comparing what would likely fit from other '91 Hondas.