The GTM Supercar Build Log

Archive for the ‘Fuel System’ Category

Exhaust Mesh Glued, Intake Tubing Secured, Fuel Vent Filter Hosing

Sunday, August 8th, 2010

With the gluing of the exhaust mesh pieces into place I have officially completed the GTM Assembly Manual.  I removed the diffuser to get to the underside of the mesh easier.  Hopefully the weatherstripping trim pieces will hold up to the exhaust temperatures, but if not I will either roll the mesh back (like the manual has you do), or come up with something else to use.

After gluing the mesh in place I secured the intake tubing to the frame. Josh found some cool swivel zip tie mounts that take 2 zip ties and have a swivel in the middle for flexible mounting. The bottom zip tie goes around the frame the tubing passes over, and the top zip tie goes around the tubing, effectively cinching it down to the frame without the need of any hangers or mounts.

Finally, I cleaned up the hosing that connects each fuel tank vent to the air filter. I lengthened the fuel hose and secured it to the top frame member of the chassis running  behind the rear window, and then secured the filter to the frame. Lastly, another fuel hose was attached to the fuel filter ‘out flow’ port and ran to the back of the car for disposing of fumes away from the cabin.

Fuel Leak Drama and Alignment

Saturday, May 16th, 2009

Wednesday afternoon the GTM left me a present in the form of a puddle of fuel under the passenger tank. I traced the leak to the fuel sender unit mount and when I tried tightening down the fuel sender bolts more the leak got worse. I had to pull the fuel tank (after draining all the fuel) and remove the fuel sender unit. A quick inspection showed tears around several of the bolt holes in the tank gasket. I made a quick call to the GM dealer and they had a new pair for me Thursday morning (decided to change the other tank’s gasket as well since I had the passenger tank out already). Unfortunately the gaskets they received were not the correct ones. I promptly ordered another set of gaskets for 97-99 tanks in hopes that they would work. Luckily, I was able to get them overnighted again and got them Friday morning. They were the correct ones and I was able to swap the gaskets as Gorilla Gasket notes and get the tanks reinstalled in a half hour or so. Quick cycle of the fuel pump shows everything to be OK.

With the fuel situation under control we trailored up the GTM and hauled it to the alignment shop. No surprises (good), and the wheels are aligned properly now.

The GTM ships Sunday morning.

Fuel Line/Loom Secured, Underbody and Skid bars, Passenger Tunnel Aluminum, Sound Dampening

Monday, May 4th, 2009

Productive weekend on the GTM. The fuel line was secured to the chassis with some padded clamps, and then then wire loom containing the fuel system wiring was secured to the main braided fuel line.  When I went to secure the braided fuel line to the frame I realized I had ran the line along the wrong side of the frame, so I had to drain some fuel and pull the braided line off of the bulkheads and re-route it. Kind of a pain in the butt, and resulted in a nice gas-fume headache. The hardlines were also secured to the frame.

The engine underbody panel was secured to the frame with the skid bars and the remaining exposed holes were screwed in for easy removal in the future. The previously ‘screwed on’ removable engine panel cover was riveted on instead since I made the entire panel removable. The engine panel piece was also covered with Dynamat. 

The last remaining passenger tunnel aluminum piece was riveted to the frame, then covered with Dynamat and Dynaliner – just needs suede!

My old college roomate came down to visit today and check out the build so I gave him a quick spirited ride in the go-kart. Definitely got on it a little more than last time. This thing is a blast to drive.

Fuel Filter connected to rail, Transmission Cooler and Pump Install Completed, Fluids Filled, Fuel Gauge Tested, Clutch Bled

Sunday, April 19th, 2009

The other night the fuel filter output was finally connected to the fuel rail, and the transmission cooler was installed. With the cooler in place the AN lines were made and connected. I am using an inline oil temperature sensor that will activate the oil pump when the oil reaches 180 degrees. This connects to the cooler inlet and wires to the oil pump (wiring needs to be done yet). 

With the transmission and fuel lines completed the transmission was filled with Swepco 210 gear oil, the fuel system got 5 gallons of gas, and some coolant was added. When the engine runs the coolant fill procedure will be followed.

With some fuel in the tank I wanted to test out the fuel gauge. The gauge takes a switched 12v, ground, and the fuel sender wire in the painless harness. The first time I hooked it up it pegged at way past full, which was obviously not the case. After some research I realized I did not have to wire the fuel harness sensor ground to the PCM, so I cut the wire and ground it to the chassis and the fuel gauge worked. It reads at around 1/8th tank with 5 gallons, so it is reading low, but that is better than reading high!

I also replaced the oil-fill cap with a screw in K&N breather, and finished bleeding the clutch slave. To finish the clutch slave bleed the slave had to be removed from the transmission and held high with the bleeder at the highest point. This got the rest of the air out of the system and the clutch is extremely firm now. The pedal only needs to travel half its full range-of-motion to engage the clutch.

Cable Shift Completed, Passenger Fuel Tank Installed, Most Passenger Tunnel Aluminum Installed, Engine Harness Cleanup

Sunday, April 12th, 2009

Finally got the cable shift working. Some extra fine-tuning and adjustments had to be made within the cable shift box to shorten the shifter cable, but things work great now. Nice short, crisp shifts.

After doing the cable shift I moved onto the passenger fuel tank installation. Before I could put the fuel tank in I had to rivet the second rear aluminum panel into place. With that out of the way I slid/forced the tank into place and connected up all the lines. The vapor exit tube was linked to the previously installed filter on the driver side fuel tank. All that remains to complete the fuel system is to connect the fuel filter output port to the fuel rail.

Finally, I cleaned up the engine harness some more by looming the starter wires, and moving any wires that stray too close to the headers.

Driver-side Axle, Water Pump Hoses, Clutch Pedal Mod, Other Stuff

Saturday, March 28th, 2009

Earlier today I finished the clutch pedal mod by placing some good grip tape on it. It looks pretty ‘factory’ now.

Tonight I started out by cutting the water pump hoses to length and then connecting them to the 45-degree fittings. Much nicer. I also started reconnecting the water pump corrugated lines – I decided to use better hose clamps for these connections.

After that I moved on to installing the driver-side axle. This was pretty straight forward. The passenger side will go in after I install the starter. I also noticed the trans/engine was off-center by a good amount, but after I slid in the rear frame member/transmission mount it centered up pretty good.

Lastly, the fuel crossover hose was installed on the fuel rails.

Accessory Switch Wiring and Fuel Filter Install

Tuesday, March 24th, 2009

No balancer bolts from ATI yet. Shocker!

Tonight I installed the new fuel filter onto the passenger side engine cover next to the fuse box and connected up the appropriate fuel lines to it. Afterwards I attached the fuel vapor filter setup I am going to be using to the driver fuel tank. This is not mentioned in the GTM build manual, but it will help to prevent excessive fuel vapor from stinking up the car. Once the passenger tank is in I just have to run the line over to the vent hose on the top of the tank.

With the fuel stuff done I finally finished up the wiring for the fog lights and flashers switches. A ground screw was drilled into the tunnel frame and I split the ‘instrument panel lighting’ wire from the Painless harness so I could run a length of it to each switch. The switches were then connected as necessary so that they fire their respective relays when pressed. I finished up by looming the wiring a bit and did some looming on the engine harness as well.

The cam harness extension I ordered from Casper’s Electronics will not work for me – they say the plug is correct, but it is obviously not as the cam sensor on the LS2 is keyed and the plug they use has no slot for a key. I will be making my own extension harness and returning this one.

Fuel Lines Routed

Monday, March 23rd, 2009

I finally got some work done on the fuel system. First, I ran the AN hose under the frame and connected it to the driver tank. Then I ran the 5/16″ and 3/8″ lines that connect the hardline crossovers to the tank. Finally, the sensor was plugged in.

Moving on to the passenger side (much tougher to work with due to very tight space (all the wiring), I set the fuel filter into place (haven’t installed yet, waiting for a new one to arrive) and mocked up all the lines then cut and fitted them as needed. Once the car is ready for fuel it will only take a few minutes to connect all the lines up.

I also applied weather strip to the tanks/frame points where there will be rubbing and contact.

Clutch Switch Bracket, Fuel Tank Harness, Footbox Cover Prep

Sunday, March 15th, 2009

Today I riveted my clutch switch bracket I made into place – works pretty well. I just used a piece of scrap aluminum that was laying around and cut it to shape and painted it. 

After I finished the clutch switch I moved on to the fuel tank harness. I realized last  night that the harness needs to be reworked to lengthen the ‘passenger tank’ sensor so that it can reach its appropriate plug on the driver’s side of the car. Stripping off the ancient electrical tape was a blast. Afterwards I just added a few feet of wire to the passenger tank plug, doubled over excess wire to ‘shorten’ the driver’s fuel tank (now in the passenger side of the car), and loomed it all up. With it all ready to go I placed the harness into the car so it just needs to be plugged in. I also connected the engine harness grounds to the engine with some newly acquired bolts.

The footbox and console cover aluminum panels were klecko’d in place and the frame was drilled out so these can be installed later.

Wiring and Fuel System Prep

Monday, March 9th, 2009

Tonight I spent a little time dabbling with organizing the footbox wiring, which is now starting to look acceptable. While I was doing that I connected the clutch cruise control cut-off switch plug wires. As far as wiring goes, I only need to finish extending my cooling fan wires (waiting on more multilink splices from Josh),  wire the tach and speedo (need to get resistors), and finish the fog light relay (need the relay plug).

Before I shutdown I prepped all the donor fuel system hard-lines by removing the 8mm and 10mm quick-fit adapters and trimmed the rubber lining off the output hard-line on the fuel pump (to be cut and flared later).  I’ll probably set the tanks in place soon temporarily so I can measure the hose lengths and get those all ready so once the AC issue is solved I can just drop everything in and hook it up in a snap.