# DropTubeBuilder: Fuel Tanks — Drop tube cuts & gauge charts

> Fuel system measurement and diagnostic tool for technicians. (iPhone/iPad app by Chris Thrasher.)

- Source: https://appshunter.io/ios/app/droptubebuilder-fuel-tanks/id6740597739 (this page in markdown: same URL + `.md`)
- Developer: [Chris Thrasher](https://appshunter.io/developer/1790762521)
- Category: Utilities, Productivity
- Price: Free with in-app purchases
- Rating: 5.00/5 from 4 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 16.6 · 2 MB
- Languages: American English, French (France), German (Germany), Hindi, Chinese (Simplified, China), European Spanish
- Released: 2025-02-03
- Data updated: 2026-08-27
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/droptubebuilder-fuel-tanks/id6740597739/reviews.md

## What is DropTubeBuilder?

DropTubeBuilder is the offline field tool for fuel system technicians who cut overfill drop tubes, build tank charts, and work alarms on site. Everything works with no signal, because the pit does not have any.

DROP TUBE CUT MATH
Enter the measurements and get the cut length that puts the overfill valve at the 95 percent regulatory fill level. Supports Franklin Defender, EMCO, and OPW ISO valves, with the seat to bottom, tank height and riser measurements each handled properly. Upper cut, lower cut and total length come back with the shutoff height so you can check the result before you cut anything.

TANK CHART BUILDER
Build a volume chart in eighth inch increments for any tank, and export it as a PDF you can leave on site or file.

ERROR CODES
Nearly 600 codes covering Gilbarco Encore 300, 500S and 700S, Wayne Ovation, Veeder-Root TLS-300, TLS-350, TLS-450, TLS-450 PLUS and TLS4, and Franklin INCON EVO 550 and 5000.

Tap any code and you get what it actually means, then an ordered list of what to check, most likely cause first, so you can work the alarm instead of just reading it back. Line test failures start with the programming that causes most false failures. Console faults tell you when the alarm is an audit entry rather than a fault. Where an alarm carries a compliance consequence, that is stated after the repair steps, not instead of them.

Searchable, fully offline, and written to be verified against the manufacturer service manual rather than to replace it.

PUMP CONTROLLERS
Fault codes, status codes, DIP switch settings and calibration notes for FE Petro MagVFC and Guardian SPGC 220 controllers.

EPD THREE YEAR INSPECTION
Work the inspection criterion by criterion and get a clear pass or fail, then export a signed PDF record. The footer reminds you to keep the record copy for three years, because that is the part people forget.

MEASUREMENT HISTORY
Every calculation is saved with its site name, so last year's job is there when you go back. Re export any past calculation as a PDF.

BUILT FOR THE FIELD
Everything ships inside the app. No account, no login, no server, no advertising, and nothing collected about you or your sites. It works in a tank pit with no bars.

Available in English, Spanish, French, German, Hindi and Chinese.

FREE TRIAL, THEN A SUBSCRIPTION
Download and start a free trial with full access. After the trial, a subscription keeps the calculators, the code libraries, the inspection and the exports available.

Terms of Use: https://thrasherapps.com/droptubebuilder/terms.html
Privacy Policy: https://thrasherapps.com/droptubebuilder/privacy.html
Support: https://thrasherapps.com/droptubebuilder/support.html

## Key features

- Accurate drop tube length calculations
- 95% fill level support
- Tank volume chart builder
- Dispenser error code reference
- User-friendly field interface

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| DropTubeBuilder Pro monthly | $4.99 | per month |
| DropTube Pro Annual | $24.99 | per year |


## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/droptubebuilder-fuel-tanks/id6740597739/reviews.md

### 5/5 — Great App

*2026-07-05*

Can be used local on device.  Has amazing tools for fuel work.

## Frequently asked questions about DropTubeBuilder

### What is DropTubeBuilder used for?

DropTubeBuilder is a utility app designed for fuel system technicians. It helps with accurate measurements for overfill drop tubes and provides quick diagnostics for dispenser errors, ensuring compliance and efficiency.

### Does DropTubeBuilder have ads?

No, DropTubeBuilder does not contain advertisements. The app is free to download and use, with optional in-app purchases for advanced features.

### What are the subscription options for DropTubeBuilder Pro?

DropTubeBuilder Pro offers a monthly subscription for $4.99/P1M and an annual subscription for $24.99/P1Y. The annual plan includes a 3-day free trial.

### How accurate are the drop tube calculations in DropTubeBuilder?

The app provides precise drop tube length calculations based on simple input measurements, ensuring overfill valves sit exactly at the regulatory 95% fill level.

### What dispenser brands does DropTubeBuilder support for error codes?

DropTubeBuilder includes a reference for dispenser error codes for both Gilbarco and Wayne dispensers, offering possible causes and troubleshooting steps.

### On what devices can I use DropTubeBuilder?

DropTubeBuilder is available for use on iPhones and iPads, making it a versatile tool for technicians in the field.

### How often is DropTubeBuilder updated?

The latest version, 1.1.7, was released on January 26, 2026. Updates are provided to ensure the app remains reliable and current with industry needs.

### What is the age rating for DropTubeBuilder?

DropTubeBuilder has an age rating of 4+, making it suitable for a wide range of users. This indicates it contains no mature content.

## Version history (last 5 releases)

### 1.2.3 — 2026-08-22

Every error code now walks you through the repair.

Veeder-Root, Gilbarco, Wayne and Franklin alarms all carry an ordered list of what to check, most likely cause first, so you can work the problem instead of just reading what the console already told you. Line test failures start with the programming that causes most false failures. Nearly 600 codes rewritten.

New app icon. The error codes section is now just "Error Codes," since it covers consoles as well as dispensers.

### 1.2.2 — 2026-08-15

The full error code library is now free on the web

Every dispenser and ATG code in this app is now readable at thrasherapps.com, no download needed. Gilbarco 500 and 700 series and Encore 300, Wayne Ovation, Veeder Root TLS-300 through TLS4, and Franklin INCON EVO 550 and 5000. Around 600 codes, searchable, free.

Useful when you are at a desk, or when you want to send a code to somebody who does not have the app.

This release is otherwise maintenance: stability work and updated App Store images.

If you are new here, or have not opened it in a while:

DROP TUBE CUT MATH
Enter the measurements and get the cut length that puts the overfill valve at the 95 percent regulatory fill level. Franklin Defender, EMCO and OPW ISO, with the seat to bottom, tank height and riser measurements each handled properly.

TANK CHART BUILDER
Volume charts in eighth inch increments for any tank, exported as a PDF you can leave on site.

DISPENSER AND ATG ERROR CODES
Tap any code for the likely causes and the troubleshooting steps, not just a description of the alarm.

PUMP CONTROLLERS
Fault codes, status codes, DIP switch settings and calibration notes for FE Petro MagVFC and Guardian SPGC 220.

EPD THREE YEAR INSPECTION
Criterion by criterion, a clear pass or fail, and a signed PDF record.

Everything works with no signal, because the pit does not have any.

Something wrong or missing? Tell me and I will fix it. This is built by one person and every message gets read.

### 1.2.1 — 2026-08-10

Franklin cut math corrected

The Franklin Defender calculation now matches Franklin's own official calculator exactly. If you used the app for a Franklin cut before this update, your numbers will change. EMCO was checked against EMCO's published worksheet and confirmed correct as it stood. Both now show the manufacturer worksheet notes under the result, so you can see which method produced the number.

NEW: PUMP CONTROLLERS
Fault codes, status codes, DIP switch settings and calibration notes for FE Petro MagVFC and Guardian SPGC 220.

MORE ATG ALARMS
Franklin EVO 550 and EVO 5000 alarms added, 97 entries.

TAP ANY ERROR CODE FOR THE FULL DETAIL
Codes now open to the likely causes and the troubleshooting steps, instead of just the alarm text.

TANK CHART PDF EXPORT
Export a tank chart as a PDF. Every PDF now shares with a proper file name instead of a generic one.

Also: entitlement checks hardened, with a readout in Diagnostics if you ever need to see why access is not showing.

### 1.2.0 — 2026-07-05

The biggest update yet, built from real field work.

• EPD 3 Year Inspection: run the Georgia EPD flapper and valve inspection in the app. Enter the form measurements, get an instant PASS or FAIL, and export a signature ready PDF report.
• Pump Controllers: fault codes, DIP switch settings, and calibration steps for the FE Petro MagVFC and the new Guardian single phase controller, all searchable.
• Franklin EVO 550 and 5000 tank gauge alarms: 97 alarms with causes and recommended actions.
• Expanded Gilbarco Encore 500 error codes.
• Tank Chart Builder now shows the 95% and 90% overfill levels and exports a printable PDF chart.
• Drop tube math verified against the official OPW, Franklin, and EMCO worksheets, with Franklin cut lengths corrected to match their calculator.
• Every PDF export now shares as a properly named file for email, text, or Files.
• Improved iPad layouts throughout.

### 1.1.8 — 2026-06-07

• Corrected the 95% shutoff to use 95% by VOLUME (from the tank chart) — the right method for horizontal tanks.
• New searchable Veeder-Root TLS-300/350/450/450 Plus/4i alarm + troubleshooting library.
• Rebuilt dispenser error-code screen with fast search.
• Cleaner drop tube calculator with two clear shutoff modes.
• Reliability fixes throughout.

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## More apps by Chris Thrasher

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All apps by Chris Thrasher: https://appshunter.io/developer/1790762521

## Related topics

[chris thrasher](https://appshunter.io/ios/topics/chris-thrasher) · [veeder root](https://appshunter.io/ios/topics/veeder-root) · [gilbarco](https://appshunter.io/ios/topics/gilbarco)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-27.*